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Service Manual TX1 and TX3 True RMS Digital

1. 8 6 Table 8 5 Optional accessories 8 6 1 and TX3 True RMS Digital Multimeter Service Manual I Ii General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures To Avoid Fire or Connect and Disconnect Properly Do not connect or disconnect probes or test Personal Injury leads while they are connected to a voltage source Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Replace Batteries Properly Replace batteries only with the proper type and rating specified Do Not Operate Without Covers Do not operate this product with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for this product Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service
2. Do all functions work Replace fuse Replace No circuit Does backlight work board Instrument seems to be working If problems still exist you may need to contact your local Tektronix service center Figure 7 13 Troubleshooting three 1 and TX3 True RMS Digital Multimeter Service Manual 7 21 Maintenance Repackaging Instructions This section contains information needed to repackage the meter for shipment or storage Packaging Use a corrugated cardboard shipping carton having a test strength of at least 275 pounds 125 kg and with an inside dimension at least six inches 15 25 greater than the meter dimensions If the meter is being shipped to a Tektronix Service Center enclose the following information m The owner s address m Name and phone number of a contact person Type and serial number of the instrument m Reason for returning m A complete description of the service required Seal the shipping carton with an industrial stapler or strapping tape Mark the address of the Tektronix Service Center and also your own return address on the shipping carton in two prominent locations Storage meter should be stored in a clean dry environment The following environ mental characteristics apply for both shipping and storage meter not operating m Temperature range 40 to 60 m Altitude 12 300 m 40 354 ft See the chapter Specifications for
3. 1 6 Diode test characteristics 1 7 Capacitance range resolution and accuracy 5 000 counts only 1 7 Table 1 15 Table 1 16 Table 1 17 Table 1 18 Table 1 19 Table 1 20 Frequency characteristics resolution and accuracy 1 7 Frequency voltage range 1 8 Duty factor characteristics 1 8 Temperature characteristics 1 8 1 peak hold characteristics 1 8 Physical characteristics 1 9 Table 1 21 Environmental characteristics 1 9 Table 1 22 Certifications and compliances 1 9 Table 2 1 Setup prompts definitions and default values 2 9 Table 4 1 Performance verification checks 4 1 Table 4 2 Test equipment 4 2 Table 4 3 test record results 4 11 Table 4 4 TX3 test record results 4 15 Table 7 1 Relative susceptibility to static discharge damage 7 3 Table 7 2 List of tools 7 5 Table 8 1 Parts list column descriptions 8 2 Table 8 2 Manufacturers cross index 8 3 Table 8 3 Replaceable parts list 8 4 Table 8 4 Standard accessories
4. 0 0000 V 10 counts 0 10 mV 0 10 mV 46 00 mV 0 07 10 counts 45 87 mV 46 13 mV 460 0 mV 0 07 10 counts 460 42 mV 460 0 mV 0 07 10 counts 460 42 mV 459 58 mV 4 600 V 0 07 10 counts 4 5958V 4 6042 V 46 00 V 0 07 10 counts 45 958V 46 042 V 1000 0 V 0 07 10 counts 998 3V 1001 7 V 1000 0 V 0 07 10 counts 1001 7V 998 3 V 3 Usethe high resolution 50 000 count mode Volts peak hold test 3 2V4 MAX 30 counts 3 167 V 3 233 V 500 Hz square wave 500 Hz square wave Set input voltage to 6 4 V square wave if using a Fluke 5500A calibrator AC DC volts test 32 mV 0 7 3 count 131 8 5 460 mV 0 7 3 counts 5 The voltage is shown in the upper display readout AC DC volts amp frequency test 1 000 V 0 7 3 counts 0 990 V 1 010 V 1 000 V DC 0 7 3 counts 0 990 V 1 010 V 1 000 V 60 Hz 0 7 3 counts 0 990 V 1 010 V 500 0 6 20 kHz 1count 19 99 kHz 7 20 01 kHz 6 Manually select the 5 V range 7 The frequency is shown in the upper display readout 4 12 1 and TX3 True RMS Digital Multimeter Service Manual TX3 Performance Verification Table 4 3 TX1 test record results cont Test input Display minimum Test result Display maximum Frequency test 89 990 00 kHz 2 82 Vp p 0 002 1 count 989 97 kHz 990 03 kHz 8 Usethe high resolution 50 000 count mode 9 The Wavetek 9100 see Test Equipment t
5. Table 4 4 TX3 test record results Test input Display minimum Test result Display maximum AC volts test 1 50 00 mV 0 4 2 counts 49 6 mV 50 4 mV 460 0 mV 0 4 2 counts 458 0 mV 462 0 mV 20 kHz 0 4 2 counts 458 0 mV 462 0 mV 4 600 V 40 Hz 0 4 2 counts 4 580 V 4 620 V 0 496 2 counts 4 580 V 4 620 V 0 4 2 counts 4 580 V 4 620 V 20 kHz 0 4 2 counts 4 580 V 4 620 V 46 000 V 60 Hz 0 4 2 counts 45 80 V 46 20 V 460 00 V 60 Hz 0 4 2 counts 458 0 V 462 0 V 20 kHz 0 4 2 counts 458 0 V 462 0 V 1000 0 V 60 Hz 0 4 2 counts 994 V 1006 V 10 kHz 0 4 2 counts 994 V 1006 V 1 The upper display readout is 1 count corresponding to the input frequency AC volts frequency test upper display readout 500 0 mV 2 40 Hz 1 count 39 99 Hz 40 01 Hz 20 kHz 1 count 19 99 kHz 20 01 kHz Manually select the 5 V range 1 and TX3 True RMS Digital Multimeter Service Manual 4 17 and TX3 Performance Verification Table 4 4 test record results cont DC volts test 0 0000 V 10 counts 0 10 mV 0 10 mV 46 00 mV 0 05 10 counts 45 88 mV 46 12 mV 460 00 mV 0 05 10 counts 460 33 mV 460 00 mV 0 05 10 counts 460 33 mV 459 67 mV 4 6000 V 0 05 10 counts 4 5967V 4 6033 V 46 000 V 0 05 10 counts 45 967 V 46 033 V 1000 0 V 0 05 10 counts 0998 5V 1001 5 V 1000
6. Top case Figure 7 2 Internal assembly removal and installation Installation 1 Hold the entire assembly directly above the top case half 2 Lower the assembly down into the case half and seat the assembly firmly into the case half 3 Reinstall the two screws to secure the internal assembly to the top case half 4 Connect the battery cable to the circuit board 7 8 and TX3 True RMS Digital Multimeter Service Manual Maintenance Battery Holder The battery holder slides off the top case half after disengaging the two securing tabs The internal assembly must be removed first to allow room for the securing tabs to disengage Refer to Figure 7 3 Removal 1 Remove the internal assembly see page 7 7 2 Disconnect the battery cable from the circuit board 3 Locate the two tabs securing the battery holder to the top case half Figure 7 3 Battery holder removal and installation 4 Disengage the tabs and slide the battery holder off the top case half 1 and TX3 True RMS Digital Multimeter Service Manual 7 9 Maintenance Installation 1 Slide the battery holder down onto the top case half ensuring the two slides on the battery holder engage the matching slots in the top case half 2 Slide the holder down until the two securing tabs lock into place LCD Assembly The LCD assembly can be accessed after the internal assembly is removed from the top case half NOTE It is not
7. 4 Nothing capable of generating or holding a static charge should be allowed on the work station surface 5 Handle circuit boards by the edges when possible 6 Do not slide boards or components over any surface 7 Avoid handling in areas that have a floor or work surface covering capable of generating a static charge Susceptibility to ESD Table 7 1 lists the relative susceptibility of various classes of semiconductors Static voltages of 1 kV to 30 kV are common in unprotected environments TX1 and TX3 True RMS Digital Multimeter Service Manual Maintenance Table 7 1 Relative susceptibility to static discharge damage Relative susceptibility Semiconductor classes levels MOS or CMOS microcircuits or discrete circuits or linear 1 microcircuits with MOS inputs most sensitive ECL 2 Schottky signal diodes 3 Schottky TTL 4 High frequency bipolar transistors 5 JFET 6 Linear microcircuits 7 Low power Schottky TTL 8 TTL least sensitive 9 Voltage equivalent for levels voltage discharged from a 100 pF capacitor through resistance of 100 ohms 1 100 to 500 V 6 600 to 800 V 2 200 to 500 V 7 z 400 to 1000 V est 3 250 8 900 4 5500 9 1200 V 5 z 400 to 600 V Inspection and Cleaning This section describes how to inspect for dirt and damage and how to clean the exterior Inspection and cleaning are done as preventive maintenance Preventive maintenance when done regularly may p
8. 4 000 kO 0 1 2 counts 3 994 4 006 40 00 0 1 2 counts 39 94 40 06 400 0 399 4 400 6 4 000 0 4 4 counts 3 980 4020 40 00 1 4 counts 39 56 40 44 11 Delta mode 12 Select 50 ohm range using soft key 4 for this range only Continuity test 500 Beeper sounds 1500 Beeper does not sound Diode test 0 5 V 1 0 495 V 0 505 V and TX3 True RMS Digital Multimeter Service Manual 4 19 and TX3 Performance Verification Table 4 4 test record results cont Test input Display minimum Test result Display maximum Capacitance test 13 14 4 000 nF 1 5 counts 3 955 nF 4 045 nF 40 00 nF 1 3 counts 39 57 nF 40 43 nF 4 000 uF 1 3 counts 3 957 uF 4 043 pF 40 00 pF 3 3 counts 38 77 uF 41 23 pF 400 00 387 7 uF 412 3 uF 40 00 mF 15 3 3 counts 38 77 mF 41 23 mF 13 Variations in test equipment can cause erroneous readings Use a fixed value capacitance standard if instability occurs 14 Set the DMM to Delta mode Delta mode removes stray capacitance for low capacitance measurements 15 Wavetek 9100 only DC current test 0 0 pA 4 counts 0 4 uA 0 4 pA 460 0 0 2 4 counts 458 7 uA 461 3 460 0 pA 458 7 pA 4 600 mA 0 2 2 counts 4 589 mA 4 611 mA 46 00 mA 0 2 2 counts 45 89 mA 46 11 mA 460 00 mA 0 2
9. TX1 TX3 FUSE CARTRIDGE 13 32 X 1 1 2 15A 1000 VACNDC 585 015 SHLD GSKT ELEC FOLD OVER ADHESIVE 0 25L X 0 51W BECU BRIGHT NI PLT TX1 TX3 CARRIER ASSY BATTERY TX1 TX3 BATTERY DRY 1 5V ALKALINE 3 COVER ASSY BATTERY TX1 TX3 O RING WATER SEAL 3 24 X 1 75 TX1 TX3 CLICKER ASSY TX1 TX3 Mfr code TK1163 TK1163 62351 TK1163 TK2376 TK1163 TK1163 TK6126 TK2376 TK1163 80009 0A828 8X345 0 01 1163 0 05 15915 2647 1163 2383 1163 56329 1163 Mfr part number 431 0474 00 431 0475 00 AS568A 902 650 3683 00 260 2688 00 426 2562 00 342 1028 00 VL 2572 100680 650 3684 00 679 4091 00 SS 11 7 G 214 4718 00 K35 1 57 X 10 PN PT STL BLK 650 3682 00 334 9525 00 585 015 0097 0521 19 119 5668 00 AM 3 650 3680 00 354 0748 00 650 3685 00 and TX3 True RMS Digital Multimeter Service Manual Replaceable Parts Figure 8 1 Exploded view 8 5 and TX3 True RMS Digital Multimeter Service Manual Replaceable Parts Table 8 4 Standard accessories Standard accessory Testlead set Tables 8 4 and 8 5 list the standard and optional accessories provided for the 1 and TX3 True RMS Digital Multimeters Product or part number ATLO1 or equivalent Test leads Certified to 1000 V CAT Ill 1 red 1 black Alligator clips Certified to 1000 V CAT Ill 1 red 1 black
10. 0 V 0 05 10 counts 1001 5V 0998 5 V 3 Usethe high resolution 50 000 count mode Volts peak hold test 3 2V4 500Hz MAX 30 counts 3 167 V 3 233 V Square wave 3 2V 4 500 Hz MIN 30 counts 3233V 3 167 V square wave Setinput voltage to 6 4 V square wave if using a Fluke 5500A calibrator AC DC volts test 32 460 mV 0 5 3 counts 457 4 mV 5 3 Thevoltage is shown in the upper display readout AC DC volts and frequency test 1 000 V 0 990 V 1 010 V 1 000 V DC 0 7 3 counts 0 990 V 1 010 V 1 000 V 60 Hz 0 790 3 counts 0 990 V 1 010 V 6 Manually select the 5 V range 7 The frequency is shown in the upper display readout 4 18 1 and TX3 True RMS Digital Multimeter Service Manual TX3 Performance Verification Table 4 4 test record results cont Test input Display minimum Test result Display maximum Frequency test 89 990 00 kHz 2 82 Vp p 0 002 1 count 989 97 kHz 990 03 kHz 8 Usethe high resolution 50 000 count mode 9 The Wavetek 9100 see Test Equipment table is the recommended test equipment to accurately perform this test Duty factor test 10 10 096 5 Vp p 0 1 0 05 9 9 96 10 196 100 Hz kHz 1 count 1096 DF pulse 10 The duty factor is shown in the upper display readout Q test 00001 4 counts 0 00 040 40 00 012 0 1 10 counts 40 14 Q 400001 0 1 4 counts 399 20 400 8 Q
11. 1 16 Frequency voltage range Cont Range Sensitivity 10 Hz 100 kHz Sensitivity 1 MHz 1 1 For voltages gt 100 V the maximum volts Hz product is 10 MVHz Table 1 17 Duty factor characteristics Characteristics Description Range 1 Hz to 100 kHz Accuracy 0 1 0 05 per kHz for input logic signals only Signal coupling DC Resolution 0 1 Sensitivity 30 of range Table 1 18 Temperature characteristics Characteristics Description Main display Range 50 C to 4980 C Accuracy 3 typical Thermocouple type K Upper display Accuracy 3 C of ambient temperature typical Use the water and ice offset calibration method on page 2 9 for accuracy to 1 0 C Table 1 19 1ms peak hold characteristics Description Specified voltage or current measurement 30 counts of the peak value of a single 1ms pulse 5 000 count mode only 1 and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 20 Physical characteristics Characteristic Description Dimensions x W D 38 mm x 88 mm x 183 mm without holster Weight with batteries 383 g 13 5 02 With holster 539 g 110 3 oz Table 1 21 Environmental characteristics Characteristic Description Temperature Operating 10 to 50 C Non operating storage 40 to 460 C Humidity 40 to 435 C 8090 35 to 440 C 7096 40 to 460 lt 5590 Altitude Op
12. 2 counts 458 9 mA 461 1 mA 4 600 A 4 580 A 4 620A 10 00 A 0 8 2 counts 9 90 A 10 10 A 4 20 1 and TX3 True RMS Digital Multimeter Service Manual and TX3 Performance Verification Table 4 4 test record results cont AC current test 16 0 0 pA 2 counts 0 0 pA 0 2 uA IT 4 600 mA 60 Hz 0 6 2 counts 4 570 mA 4 630 mA 5 2 2 counts 4 506 mA 4 694 mA 5 kHz 2 0 2 counts 45 06 mA 46 94 mA 460 0 mA 60 Hz 0 6 2 counts 457 0 mA 463 0 mA 5 kHz 2 2 counts 450 6 mA 469 4 mA 4 600 60 2 0 6 2 counts 4 570 A 4 630 A 2 2 counts 4 506 A 4 694 A 10 00 290 2 counts 16 0 690 2 counts 9 92 A 9 78 A The upper display readout is 1 count corresponding to the input frequency 1 and TX3 True RMS Digital Multimeter Service Manual 10 22 A 4 21 and TX3 Performance Verification 4 22 1 and TX3 True RMS Digital Multimeter Service Manual iii dL Adjustment Procedure 5 4 Adjustment Procedure Adjustment of the TX1 and TX3 meters should only be performed if the Performance Verification procedure indicates that adjustment is necessary There are no internal adjustments Contact Tektronix for adjustment information See page x for methods for contacting Tektronix 1 and TX3 True RMS Digital Multimeter Service Manual
13. 5 1 Adjustment Procedure 5 2 1 and TX3 True RMS Digital Multimeter Service Manual Options Options There are no options available for the TX1 and TX3 meters For a list of available accessories refer to the Replaceable Parts chapter 1 and TX3 True RMS Digital Multimeter Service Manual 6 1 6 2 1 and TX3 True RMS Digital Multimeter Service Manual Maintenance TE Maintenance This chapter contains the information needed to do periodic and corrective maintenance on the TX Series True RMS Digital Multimeters The following sections are included Preparation refers you to important information contained elsewhere in this manual m Preventing ESD provides general information on preventing damage to internal modules when doing maintenance m Cleaning provides procedures for cleaning the exterior of the meter m Drying Procedure provides instructions to dry the meter should it be exposed to water m Disassembly Assembly Procedures provide procedures for the disassembly and reassembly of the meter m Troubleshooting provides information to help isolate failed modules m Repackaging Instructions provides packaging information for shipment or storage Related Maintenance Procedures The following sections contain information and procedures related to mainte nance m Chapter 2 Operating Information covers instructions
14. Protective boot 650 3681 XX or equivalent User Manual Language Part Number Language Part Number English 070 9880 XX Portuguese 070 9885 XX French 070 9881 XX Korean 070 9886 XX German 070 9882 XX Simplified Chinese 070 9887 XX Italian 070 9883 XX Traditional Chinese 070 9888 XX Spanish 070 9884 XX Japanese 070 9889 XX Installed dry cell batteries Fuse installed 15 A 1000 Vg us fast Temperature probes TX3 only Table 8 5 Optional accessories Optional accessory Probing solutions Nylon softcases Clamp on current probes Cables and software TX1 and TX3 Service Manual 8 6 Two AA 1 5 V alkaline batteries IEC LRG or ANSI NEDA 15 159 0409 00 Littelfuse 585 015 or 11 1000 Buss DMM B 11 or equivalent K type thermocouple adapter and 1 or equivalent bead probe Product or part number ATL21 ATL22 ATL23 ACL21 ACL22 ACL23 ACL24 AC12 AC13 A605 A621 A622 WSTRM 070 9893 XX and TX3 True RMS Digital Multimeter Service Manual
15. Setup menu See page 2 8 for more information about the Setup menu Use the RANGE button to manually select a range Press and hold RANGE for two seconds to return the meter to auto range mode The meter is in auto range mode when the indicator is on The range and units are displayed above the indicator to the right of the bargraph Press this button to scroll through the live maximum minimum maximum minimum and average values The elapsed time between the last recorded event and the start of the test shows in the upper display Press and hold the M M A button for two seconds to exit M M A mode 1ms 1 ms Peak Hold To activate 1 ms peak hold first press the blue button and then the M M A button while the indicator shows on the display When in 1 ms mode the LCD displays the and indicators Display resolution in 1ms peak hold is 5 000 counts Live and average readings are not available in 1ms peak hold mode You can use 1ms peak hold when you take AC or DC measurements The meter only records events that have a pulse width that is greater than 1 ms Press the M M A button to view 1ms peak hold minimum and maximum values The MAX value shown is the value of the positive peaks and the MIN value shown is the value of the negative peaks Press and hold the M M A button for two seconds to exit 1ms peak hold mode Press the button to turn the backlight on or off Adjust the LOFF setting in the Setup menu to adjust
16. be removed after removing the circuit board and LCD assembly Refer to Figure 7 8 Removal 1 Remove the internal assembly see page 7 7 LCD assembly see page 7 10 and circuit board see page 7 12 1 Grasp the housing and flex the corner causing the light diffuser corner to pop up 2 Flip the diffuser up and slide it out through the slot in the housing Rotate and gt slide down Figure 7 8 Light diffuser removal and installation 7 14 and TX3 True RMS Digital Multimeter Service Manual Maintenance Installation 1 From the back of the housing slide the light diffuser up through the slot and flip it down into the LCD compartment 2 Press the diffuser down to ensure it is seated into the LCD compartment Switch Keypad The internal assembly must be removed to gain access to the switch keypad The keypad is easily lifted out or placed in the top case half Refer to Figure 7 10 NOTE Avoid touching the keypad contacts on either the keypad or the circuit board Function Knob internal assembly must be removed to gain access to the function knob assembly Refer to Figures 7 9 and 7 10 Removal 1 Hold the top case half in the palm of your hand or support both ends of the top case half allowing the function knob room to be removed 2 Insert a narrow object such as a small screwdriver into the hole in the back side of the function knob and press down
17. end of the bottom case half opposite end from the batteries into the top case half 3 Pivot the bottom case half down and press firmly together 4 Secure the case halves together with the two screws 5 Install the battery cover gasket Install the gasket so that its shape matches the shape of the meter case and the bumps on the gasket point towards the batteries NOTE It s important to install the battery cover gasket correctly to retain the stated environmental characteristics 6 Insert batteries and slide the battery cover on Internal Assembly internal assembly is comprised of the circuit board and display assembly The internal assembly must be removed from the case half as a unit Removal 1 Disconnect the battery cable from the circuit board Do not pull on the wires 2 Remove the two screws securing the internal assembly to the top case 3 From the front of the top case half push in on the input connectors to loosen the assembly from the case half 1 and TX3 True RMS Digital Multimeter Service Manual 7 7 Maintenance 4 Liftthe entire assembly straight up out of the case half NOTE The easiest method to lift the assembly out is to grasp the large component on the circuit board and lift straight up Use component to lift internal Pogo stick pin BN assembly straight up Remove screws 2 Battery connector Push up on the Battery cable input connectors
18. necessary to remove the circuit board to remove the LCD assembly Removal 1 Remove the internal assembly see page 7 7 2 Using a small flat blade screwdriver disengage the four tabs at the top end of the assembly securing the display bezel Disengage tabs 4 Figure 7 4 LCD bezel removal and installation 3 Liftthe top end of the display bezel up until the four tabs at the bottom end of the display assembly disengage 4 The LCD display and contacts can be lifted out of the display housing 7 10 and TX3 True RMS Digital Multimeter Service Manual Maintenance LCD display Small bump LCD contact strips WC wee Figure 7 5 LCD removal and installation Installation 1 Install the two LCD contact strips into the display housing 2 Place the LCD into the display housing NOTE Place the LCD into the assembly so that the side with the small bump is aligned with the cutout in the housing and the contacts are facing the contact strips 3 Press the bottom of the LCD bezel down until the bottom four tabs snap into place 4 Place the top of the LCD bezel over the display and push down to snap the top four tabs into place NOTE Before proceeding check to make sure all eight tabs securing the LCD bezel are seated properly The display may have moved if all the tabs do not engage Remove the bezel check that the display is seated properly and try again 1
19. the Continuity test record Turn the calibrator output off Disconnect the calibrator from the meter Insert the meter test leads into the V and COM input connectors of the meter Short the test leads together and check for proper operation Disconnect the meter test leads and reconnect the V and COM input connec tors to the calibrator Diode Test Perform the following steps to verify the diode test accuracy 1 GU Set the function knob to O Press softkey 3 to select the diode test mode Set the calibrator to the first value in the Diode test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the Diode test record Turn the calibrator output off Capacitance Test Perform the following steps to verify the capacitance measurement accuracy 1 2 3 4 8 Set the function knob to 46 Disconnect the test leads from the meter input connectors Record the reading in the Capacitance test record 1 and TX3 True RMS Digital Multimeter Service Manual Performance Verification Null the residual DMM and lead capacitance offset as described here depending on the type of test equipment using the following sub steps a Using Wavetek 9100 with 9105 work mat and lead set m Connect the black lead from the calibrator output to the meter COM input Press the meter A button m Connect the red lead from the
20. the measurement function knob and softkeys to set the meter to the measurement function you want Use the memory informa on page 2 8 to recall RCL a reference value from memory then press the A button To exit delta mode press the A button For subsequent readouts the recalled reference value is subtracted from the actual measurement A Relative to a Programmed Value Use the measurement function knob and softkeys to set the meter to the measurement function and range you want and then press the A button While the meter is in delta mode press and hold the blue button until the Setup menu appears Use the softkeys to edit rEF to the desired value and press softkey 4 for OK To exit delta mode press the A button For subsequent readouts the programmed reference value is subtracted from the actual measurement The programmed reference value is lost when you turn off the meter You can also use the A button to make relative dB AdB measurements and TX3 True RMS Digital Multimeter Service Manual 2 7 Operating Information MEM Memory Softkeys Setup Menu 2 8 Use the memory mode to store and recall measurement values No data is lost during power cycles To activate the MEM memory mode press the blue button and then the A button while shows on the LCD display The display shows four softkey selections STO RCL CLR and EXIT STO Select STO to store the held value in the next available memory locat
21. to clean components before reassembling the meter 1 and TX3 True RMS Digital Multimeter Service Manual Maintenance Meter Case Use the following procedure to gain access to the service replaceable fuse and all replaceable modules You must first remove the protective boot to open the meter case You will need a small flat blade screwdriver and a 10 torx tip screwdriver Opening 1 Remove the battery cover Remove the batteries and the two screws one on each side of the batteries 2 Carefully insert a screw driver between the gasket and meter case and gently lift and remove the gasket Batteries Fuse F1 Figure 7 1 Opening and closing the case 7 6 1 and TX3 True RMS Digital Multimeter Service Manual Maintenance fall out of its holder Use care not to lose the contact or allow it to remain loose in the instrument when reinstalling the bottom case half See Figure 7 2 for the location of this pin CAUTION Opening the case allows a stick type electrical contact pin to 3 From the end near the batteries carefully lift the case half up until the opposite end snaps loose WARNING Installing improper fuses can cause injury and product damage The internal fuse F1 15 accessible at this time If replacing the fuse see the Replaceable Parts chapter for the proper replacement fuse Closing 1 Check that all seals and contacts are in place 2 Slip
22. useful when operating the meter in order to troubleshoot it m Chapter 3 Theory of Operation contains a circuit description at the block level Chapter 4 Performance Verification contains procedures that may be useful in isolating problems by testing performance W Chapter 5 Adjustment Procedure addresses after repair adjustment and the interval between periodic adjustments m Chapter 8 Parts List lists all replaceable parts with part numbers 1 and TX3 True RMS Digital Multimeter Service Manual 7 1 Maintenance Preparation A Preventing ESD Only qualified service personnel should perform service procedures Read the Service Safety Summary the General Safety Summary and the ESD information below before performing any service procedures CAUTION Static discharge can damage any semiconductor component in this meter When performing any service which requires internal access to the meter adhere to the following precautions to avoid damaging internal components due to electrostatic discharge ESD 1 Minimize handling of static sensitive modules 2 Transport and store static sensitive modules in their static protected containers or on a metal rail Label any package that contains static sensitive modules 3 Discharge the static voltage from your body by wearing a grounded antistatic wrist strap while handling these modules Service static sensitive devices only at a static free work station
23. within the specified Display minimum and maximum limits for each value in the AC current test record Turn the calibrator output off Disconnect the calibrator from the meter 1 and TX3 True RMS Digital Multimeter Service Manual and TX3 Performance Verification TX1 Test Record Serial number Procedure performed by Date Table 4 3 TX1 test record results Test input Display minimum Test result Display maximum AC volts test 1 50 00 mV 0 6 2 counts 49 5 mV 50 5 mV 460 0 mV 0 696 2 counts 457 0 mV 463 0 mV 20 kHz 0 6 2 counts 457 0 mV 463 0 mV 4 600 V 40 Hz 0 690 2 counts 4 570 V 4 630 V 0 6 2 counts 4 570 V 4 630 V 0 6 2 counts 4 570 V 4 630 V 20 kHz 0 6 2 counts 4 570 V 4 630 V 46 00 V 60 Hz 0 6 2 counts 45 70V 46 30V 460 0 V 60 Hz 0 6 2 counts 457 0 V 463 0 V 20 kHz 0 6 2 counts 457 0 V 463 0 V 1000 V 60 Hz 0 6 2 counts 992 V 1008 V 10 kHz 0 4 2 counts 992 V 1008 V 1 The upper display readout is 1 counts corresponding to the input frequency AC volts frequency test upper display readout 500 0 mV 2 40 Hz 1 count 39 99 Hz 40 01 Hz 20 kHz 1 count 19 99 kHz 20 01 kHz Manually select the 5 V range 1 and TX3 True RMS Digital Multimeter Service Manual 4 11 and TX3 Performance Verification Table 4 3 TX1 test record results cont DC volts test
24. 0 it is necessary to calibrate the meter to account for any thermocouple offset Temperature accuracy without performing the following calibration is 3 1 Turnon the meter in the environment you will make the measurements 2 Filla wide shallow container with ice and water Stir the ice and water mixture for two or three minutes to evenly distribute the temperature of the mixture Place the container next to the meter and submerge the tip of the bead probe in the ice and water 3 While in C or F mode allow the temperature reading to stabilize on a value this value should be very close to 0 C for C mode or 32 0 F for F mode Any deviation from 0 C or 32 F represents the thermocouple s offset 4 Once the reading stabilizes press and hold softkey 1 for C mode or softkey 2 for F mode for five seconds until the display shows 0000 or 0032 TX1 and TX3 True RMS Digital Multimeter Service Manual 2 9 Operating Information Battery Replacement 2 10 This calibrates the meter for the operating environment A shows in the upper display If you hear an error beep the offset is greater than 5 You can repeat this calibration at any time To undo this calibration return the meter to factory settings by pressing both the blue button and M M A button while powering up the meter To insure accuracy of temperature measurements you should follow this procedure when using other K type thermocouple probes
25. 2 Set the function knob to V Press softkey 2 to select DC Press the BLUE button and then the M M A button to select the 1 ms Peak Hold function Connect the yellow red and black calibrator outputs to the meter A V and COM input connectors Set the calibrator to the first value in the Volts peak hold test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the Volts peak hold test record Turn the calibrator output off AC DC Volts Test Perform the following steps to verify the AC DC voltage measurement accuracy 1 2 3 4 5 Set the function knob to V Press softkey 3 repeatedly to select AC DC Set the calibrator to the first value in the AC DC volts test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each of the values in the AC DC volts test record Turn the calibrator output off and TX3 True RMS Digital Multimeter Service Manual 4 5 Performance Verification AC DC Volts and Perform the following steps to verify the AC DC voltage measurement Frequency Test accuracy 1 2 Set the function knob to V Press softkey 3 repeatedly to select AC DC Set the calibrator to the first value in the AC DC volts and frequency test record Turn the calibrator output on Verify that the meter reads within the specified Display
26. 28 0 01 0 05 56329 62351 15915 80009 8 345 1163 2376 2383 2548 2647 6126 Manufacturer IDI INTERCONNET DEVICES STAUFFER SUPPLY CO NORTH STAR NAMEPLATE INC LAUREN MANUFACTURING COMPANY APPLE RUBBER PRODUCTS INC LITTELFUSE INC TEKTRONIX INC NORTHWEST SPRING MFG CO POLYCAST INC CONDUCTIVE RUBBER TECH PANASONIC INDUSTRIAL CO XEROX CORPORATION INSTRUMENT SPECIALTIES CO INC VL ELECTRONICS Address TEST COMPONENTS DIVISION 5101 RICHLAND AVENUE 810 SE SHERMAN 5750 NE MOORE COURT 2228 REISER AVE SE 310 ERIE STREET 800 E NORTHWEST HWY 14150 SW KARL BRAUN DR PO BOX 500 5858 WILLOW LANE 9898 SW TIGARD ST 22125 17TH AVE SE SUITE 117 1600 MCCANDLESS DR 14181 SW MILLIKAN WAY C O TEMCO NW 1336 SE 51ST STREET 3250 WILSHIRE BLVD SUITE 1901 and TX3 True RMS Digital Multimeter Service Manual The table titled Manufacturers Cross Index shows codes names and addresses of manufacturers or vendors of components listed in the parts list City state zip code KANSAS CITY KS 66106 PORTLAND OR 97214 4657 HILLSBORO OR 97124 6474 NEW PHILADELPHIA OH 44663 LANCASTER NY 14086 DES PLAINES IL 60016 3049 BEAVERTON OR 97077 0001 LAKE OSWEGO OR 97035 TIGARD OR 97223 BOTHELL WA 98021 MILPITAS CA 95035 BEAVERTON OR 97005 HILLSBORO OR 97123 LOS ANGELES CA 90010 1502 8 3 Replaceable Parts Table 8 3 Replaceable parts list Fi
27. 4 Connect calibrator test leads to the meter inputs observing the color coded leads and inputs for example yellow to red to V and black to COM Yellow Black Red NOTE Test lead colors from calibration equipment may vary WARNING To avoid electric shock avoid touching exposed connections 5 Keep the meter in the low resolution 5 000 count mode unless instructed otherwise 6 Pages 4 11 through 4 21 contain test records for the TX1 and TX3 meters Each model has its own test record Photocopy the test record pages for your model to record your test results NOTE If stability of the display reading causes questionable accuracy of a test set the meter to Average mode and TX3 True RMS Digital Multimeter Service Manual 4 3 Performance Verification Verification Procedure AC Volts Test AC Volts Frequency Test 4 4 DC Volts Test Implement the following tests to verify the performance of your TX1 or TX3 meter The procedures are written with the intent that all tests are made from beginning to end Perform the following steps to verify the AC voltage measurement accuracy 1 Setthe function knob to V Press softkey 1 to select AC default setting Connect the calibrator outputs to the meter V and COM input connectors Set the calibrator to the first value in the AC volts test record Turn the calibrator output on 5 49 Verify that meter reads within
28. Backlight Green LEDs 1 If meter is exposed to water have it inspected by qualified service personnel and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 2 DC voltage characteristics Description 3 readings typical 5 000 ct 4 readings per second 50 000 ct 1 reading per second Characteristic Settling time Reading rate Rejection ratio 120 dB at DC or 50 Hz or 60 Hz 60 dB at 50 Hz or 60 Hz 10 typical Common mode Normal mode Input impedance Table 1 3 DC voltage range resolution and accuracy Accuracy 1 Resolution 5 000 counts 50 000 counts 0 05 1 count 0 07 1 count 5V 1 100 pV Temperature coefficient Add 0 005 0 1 ct C to accuracy beyond rated temperature range Accuracy in 50 000 count mode is 96 10 counts Table 1 4 AC voltage characteristics Characteristic Description Input impedance 10 in parallel with 100 pF typical Settling time 4 readings typical Reading rate 5 000 ct 4 readings per second 50 000 ct 1 reading per second Common mode 60 dB at DC to 60 Hz rejection ratio Crest factor maximum Full scale 3 Half scale 6 AC DC total RMS volts AC RMS accuracy 0 1 1 count accuracy 1 2 and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 4 AC voltage characteristics cont Characteristic Descripti
29. IDE 1 800 835 9433 ext 2400 6 00 a m 5 00 p m Pacific time Or contact us by e mail tm app supp Gtektronix com For product support outside of North America contact your local Tektronix distributor or sales office Contact your local Tektronix distributor or sales office Or visit our web site for a listing of worldwide service locations http www tektronix com In North America 1 800 TEK WIDE 1 800 835 9433 An operator will direct your call Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 and TX3 True RMS Digital Multimeter Service Manual Introduction Service Strategy Service Offerings Warranty Repair Service Repair or Calibration Service This manual contains all the information needed for periodic maintenance of the 1 and TX3 True RMS Digital Multimeters replaceable parts are listed in Table 8 3 Replaceable parts list To remove and replace any parts follow the instructions in Dissasembly and Assembly Proce dures found in Chapter 7 Tektronix provides service to cover repair under warranty as well as other services that may provide a cost effective answer to your service needs Whether providing warranty repair service or any of the other services listed below Tektronix service technicians trained on Tektronix products are best equipped to service your TX1 and TX3 True RMS Digital Multimeters Tektronix technicians are apprised of the latest information on impro
30. LL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Service Assurance If you have not already purchased Service Assurance for this product you may do so at any time during the product s warranty period Service Assurance provides Repair Protection and Calibration Services to meet your needs Repair Protection extends priority repair services beyond the product s warranty period you may purchase up to three years of Repair Protection Calibration Services provide annual calibration of your product standards compliance and required audit documentation recall assurance and reminder notification of scheduled calibration Coverage begins upon registration you may purchase up to five years of Calibration Services Service Assurance Advantages W Priced well below the cost of a single repair or calibration W Avoid delays for service by eliminating the need for separate purchase authorizations from your company m Eliminates unexpected service expenses For Information and Ordering For more information or to order Service Assurance contact your Tektronix representative and provide the information below Service Assurance may not be available in locations outside the United States of America Name VISA or Master Card number and expiration Company date or purchase order number Address Repair Protection 1 2 or 3 y
31. MM to Delta mode Delta mode removes stray capacitance for low capacitance measurements 15 Wavetek 9100 only DC current test 0 0 pA 4 counts 0 4 uA 0 4 pA 460 0 0 2 4 counts 458 7 uA 461 3 460 0 pA 458 7 pA 4 600 mA 0 2 2 counts 4 589 mA 4 611 mA 46 00 mA 0 2 2 counts 45 89 mA 46 11 mA 0 4600 A 0 2 2 counts 458 9 mA 461 1 mA 4 600 A 4 580 A 4 620A 10 00 A 0 8 2 counts 9 90 A 10 10 A 4 14 1 and TX3 True RMS Digital Multimeter Service Manual and TX3 Performance Verification Table 4 3 TX1 test record results cont AC current test 16 0 0 pA 2 counts 0 0 pA 0 2 uA IT 4 600 mA 60 Hz 0 6 2 counts 4 570 mA 4 630 mA 5 2 2 counts 4 506 mA 4 694 mA 5 kHz 2 2 counts 45 06 mA 46 94 mA 460 00 mA 60 Hz 0 6 2 counts 457 0 mA 463 0 mA 2 2 counts 450 6 mA 469 4 mA 4 600 0 6 2 counts 4 570 A 4 630 A 2 2 counts 4 506 A 4 694 A 10 00 A 0 6 2 counts 10 08 A 290 2 counts The upper display readout is 1 count corresponding to the input frequency 16 9 78A and TX3 True RMS Digital Multimeter Service Manual 10 22 4 15 and TX3 Performance Verification 4 16 1 and TX3 True RMS Digital Multimeter Service Manual and TX3 Performance Verification TX3 Test Record Serial number Procedure performed by Date
32. Service Manual Tektronix 1 True RMS Digital Multimeter 070 9893 01 Warning The servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to all safety summaries prior to performing service Copyright Tektronix Inc rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in the U S A Tektronix Inc Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc Tektronix warrants that products that it manufactures and sells will be free from defects in materials and workmanship for a period of three 3 years from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to th
33. a complete listing of the environmental characteristics 7 22 and TX3 True RMS Digital Multimeter Service Manual us ud Replaceable Parts Replaceable Parts This section contains a list of the replaceable parts for the 1 and TX3 True RMS Digital Multimeters Use this list to identify and order replacement parts Parts Ordering Information Servicing Replacement parts are available through your local Tektronix field office or representative Changes to Tektronix products are sometimes made to accommodate improved components as they become available and to give you the benefit of the latest improvements Therefore when ordering parts it is important to include the following information in your order m number m Instrument type or model number Instrument serial number Instrument modification number if applicable If you order a part that has been replaced with a different or improved part your local Tektronix field office or representative will contact you concerning any change in part number Change information if any is located at the rear of this manual The TX1 and TX3 True RMS Digital Multimeter can be serviced by contacting your local Tektronix service center or representative for repair assistance and TX3 True RMS Digital Multimeter Service Manual 8 1 Replaceable Parts Using the Replaceable Parts List This section contains a list of the mechanical an
34. able is the recommended test equipment to accurately perform this test Duty factor test 10 10 0 5 Vp p 0 1 0 05 per 9 9 96 10 196 100 Hz 10 kHz 1 count DF pulse 10 The duty factor is shown in the upper display readout test 40 00 Q 12 0 1 10 counts 39 86 40 140 400 0 1 0 1 4 counts 400 8 Q 4 000 0 1 2 counts 3 994 4 006 40 00 0 1 2 counts 39 94 40 06 400 0 0 1 2 counts 399 4 400 6 kQ 4 000 0 4 4 counts 3 980 MQ 4 020 MQ 40 00 MQ 1 4 counts 39 56 40 44 11 Use Delta mode 12 Select 50 ohm range using soft key 4 for this range only Continuity test 500 Beeper sounds 1500 Beeper does not sound Diode test 0 5 V 1 0 495 V 0 505 V and TX3 True RMS Digital Multimeter Service Manual 4 13 and TX3 Performance Verification Table 4 3 TX1 test record results cont Test input Display minimum Test result Display maximum Capacitance test 13 14 4 000 nF 1 5 counts 3 955 nF 4 045 nF 40 00 nF 1 3 counts 39 57 nF 40 43 nF 4 000 uF 1 3 counts 3 957 uF 4 043 pF 40 00 pF 3 3 counts 38 77 uF 41 23 pF 400 00 387 7 uF 412 3 uF 40 00 mF 15 3 3 counts 38 77 mF 41 23 mF 13 Variations in test equipment can cause erroneous readings Use a fixed value capacitance standard if instability occurs 14 Set the D
35. and TX3 True RMS Digital Multimeter Service Manual 7 11 Maintenance Circuit Board circuit board be removed from the internal assembly after the internal assembly is removed from the top case half NOTE It is not necessary to remove the circuit board to remove the LCD assembly Removal 1 Remove the internal assembly see page 7 7 and LCD assembly see page 7 10 2 Disengage two tabs protruding through the middle of the circuit board 3 Disengage the four tabs at the top end of the circuit board the end without the input connectors Disengage tabs 2 Internal assembly Disengage tabs 4 Figure 7 6 Circuit board tabs 7 12 and TX3 True RMS Digital Multimeter Service Manual Maintenance 4 Liftthe circuit board off of the assembly Circuit board Contact spring LCD contact strips Figure 7 7 Circuit board removal and installation Installation 1 Ensure that the contacts listed are in place before installing the circuit board Contact spring m LCD contact strips two m EMI clip 2 Lower the circuit board straight down onto the assembly ensuring that all six securing tabs lock into place NOTE Installing a new circuit board requires that the meter be re calibrated Refer to the Adjustment chapter for calibration 1 and TX3 True RMS Digital Multimeter Service Manual 7 13 Maintenance Light Diffuser The light diffuser can only
36. asurement 2 4 and TX3 True RMS Digital Multimeter Service Manual Operating Information Input Connectors A COM O E E FUSED 600V 10 1000 15A 30 SECONDS Figure 2 5 Input connectors Input connector for current measurements up to 15 A 10 A continuous or 15 A for 3 minutes on and 10 minutes off Successive high current measure ments above 10 A require a 10 minute cooling time between measurements Rating is 600 V open circuit voltage COM Common connector All measurements are referenced to this connector V Input connector for volts frequency ohms continuity diode capacitance and temperature measurements Rating is 1000 V CAT III for all V input connector measurements cover removed WARNING To avoid personal injury do not attach meter leads with the battery CAUTION To avoid damaging the meter do not attempt to measure current with the batteries removed and TX3 True RMS Digital Multimeter Service Manual 2 5 Operating Information Button and Softkey Overview Blue Button RANGE Button M M A Minimum Maximum and Average 2 6 Button 1ms 1 ms Peak Hold Backlight Button To access functions in blue text press the blue button and then press a function button while the indicator is on The indicator shows on the display for five seconds Press and hold the blue button for two seconds to access the
37. ble of Contents Maintenance Replaceable Parts shat Ro RERO A E Sens ee 7 Related Maintenance Procedures Preparation z uen eMe NERONE Inspection and Cleaning Disassembly and Assembly Procedures Tro ubleshootmg 2 events Repackaging Instructions R placeable Parts 252502 0256 5 e ERI OR E ee we RS 8 Parts Ordering Information Using the Replaceable Parts List TX1 and TX3 True RMS Digital Multimeter Service Manual Table of Contents List of Figures Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 3 1 Figure 7 1 Figure 7 2 Figure 7 3 Figure 7 4 Figure 7 5 Figure 7 6 Figure 7 7 Figure 7 8 Figure 7 9 Figure 7 10 Function knob and switch keypad installation Front panel overview Rear panel overview Display indicators Measurement function knob Input connectors Battery replacement Simple block diagram Opening and closing the case Internal assembly removal and installation Battery holder removal and installation LCD bezel removal and i
38. calibrator output to the meter V input b Using Fluke 5500A or Wavetek 9100 without the work mat and lead set m Connect the black lead from the calibrator output to the meter COM input m Connect the red lead to the meter V input Do not connect the red lead to the calibrator output yet Press the meter A button m Connect the red lead to the calibrator output Set the calibrator to the first value in the Capacitance test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the Capacitance test record Turn the calibrator output off DC Current Test Perform the following steps to verify the DC current measurement accuracy 1 Set the function knob to Set the calibrator to the first value in the DC current test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the DC current test record Turn the calibrator output off and TX3 True RMS Digital Multimeter Service Manual 4 9 Performance Verification 4 10 AC Current Test Perform the following steps to verify the AC current measurement accuracy 1 pe ee e Set the function knob to Select AC with the softkeys Set the calibrator to the first value in the AC current test record Turn the calibrator output on Verify that the meter reads
39. cond 50 000 ct 1 reading per second Table 1 7 DC current range resolution and accuracy Resolution Accuracy Range 5 000 counts 50 000 counts TX1 TX3 500 pA 100 nA 10 nA 0 2 4 counts 1 5 1 pA 100 nA 0 2 2 counts 2 50 mA 10 pA 500 mA 100 pA 10 pA 5A 1 100 uA 0 496 2 counts 2 10 10 1 0 8 2 counts 2 15 A for 3 minutes Temperature coefficient Add 0 05 0 1 ct C beyond rated temperature range Accuracy in 50 000 count mode is 96 40 counts Accuracy in 50 000 count mode is 20 counts Table 1 8 AC current characteristics Characteristics Burden voltage Description 0 5 mA to 5 A 0 9 V max 10 A 1 0 V max AC DC 1 Accuracy AC RMS amps accuracy DC amps accuracy Upper display frequency Accuracy 0 002 1 count for 20 Hz to 5 kHz Sensitivity 10 of range 14 and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 8 AC current characteristics cont Characteristics Description Settling time 4 readings typical 5 000 ct 4 readings per second 50 000 ct 1 reading per second Reading rate 1 5 000 count mode only Table 1 9 AC current range resolution and accuracy Accuracy 1 TX1 40 Hz 1 kHz 0 696 2 counts gt 1 kHz 3 kHz 1 096 2 counts 23 kHz 5 kHz 2 096 2 counts Resolution 5 000 cou
40. d occur in the environment around and within a product Typically the internal environment inside a productis considered to be the same as the external Products should be used only in the environment for which they are tested Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service and TX3 True RMS Digital Multimeter Service Manual Specifications 1 12 1 and TX3 True RMS Digital Multimeter Service Manual Operating Information Br i Operating Information This chapter provides basic information about the controls and functions of the 1 and TX3 meters For more detailed operating information refer to the User manual supplied with the meter Front and Rear Panel Overview Tektronix ms 1111 He w mp FMKQHZMNA 28 50020 RC Ags EXITOK V 2 D Cs 093 oe 600V A Y 15A8MINUTES 1 Extra large LCD display with dual numeric readout 2 Measurement function knob Use to select a measurement 3 Blue Button Use to access 1ms MEM and Setup menu 4 RANGE Button Use to set measurement range 5 M M A Bu
41. d or electrical components that are replaceable for the TX1 and TX3 meters Use this list to identify and order replacement parts The following table describes each column in the parts list Table 8 1 Parts list column descriptions Column Column name Description Figure amp index number Items in this section are referenced by figure and index numbers to the exploded view illustrations that follow Tektronix part number Use this part number when ordering replacement parts from Tektronix Serial number Column three indicates the serial number at which the part was first effective Column four indicates the serial number at which the part was discontinued No entry indicates the part is good for all serial numbers 5 This indicates the quantity of parts used 6 Name amp description An item name is separated from the description by a colon Because of space limitations an item name may sometimes appear as incomplete Use the U S Federal Catalog handbook H6 1 for further item name identification 7 This indicates the code of the actual manufacturer of the 8 Mfr part number This indicates the actual manufacturer s or vendor s part number Abbreviations Abbreviations conform to American National Standard ANSI Y 1 1 1972 8 2 1 and TX3 True RMS Digital Multimeter Service Manual Replaceable Parts Mfr Code to Manufacturer Cross Index Table 8 2 Manufacturers cross index Mfr code 048
42. e is To B chip T 500 N 3 2 1 and TX3 True RMS Digital Multimeter Service Manual dE Performance Verification 7 5 Performance Verification This section contains procedures to verify that the TX1 or TX3 True RMS Digital Multimeters perform as warranted If a meter fails any of these tests it needs calibrated and or repaired The performance verification procedures confirm electrical characteristics under the following conditions W The meter operates in an 18 to 28 C 64 to 82 F ambient environment with a relative humidity of less than 80 The meter stabilizes in the stated ambient temperature for one hour The meter warms up for 30 seconds Allow the meter to settle to its final value before taking the measurement The meter remains fully assembled and in the protective boot The performance verification consists of the tests listed in Table 4 1 Table 4 1 Performance verification tests AC Volts Test AC Volts Frequency Test DC Volts Test Volts Peak Hold Test AC DC Volts Test AC4DC Volts and Frequency Test Frequency Test Duty Factor Test Test Continuity Test Diode Test Capacitance Test DC Current Test AC Current Test The performance verification procedure should be performed annually and TX3 True RMS Digital Multimeter Service Manual 4 1 Performance Verification Test Equipment The performance verification procedures use
43. e main display d Press the BLUE button to exit the setup mode Set the calibrator to the value in the Duty factor test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the Duty factor test record Turn the calibrator output off Restore default to frequency using the following sub steps a Press and hold the BLUE button for two seconds b Press softkey 4 until POL is displayed in the upper display c Press softkey 1 until OFF is displayed in the main display d Press the BLUE button to exit the setup mode Test Perform the following steps to verify the resistance measurement accuracy in mode 1 Bop A Set the function knob to O Set the calibrator to the first value in the test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each value in the test record Turn the calibrator output off Set the function knob to OFF and TX3 True RMS Digital Multimeter Service Manual 4 7 Performance Verification Continuity Test Perform the following steps to verify continuity accuracy 1 905 m c Set the function knob to Select gt with the softkeys Set the calibrator to the first value in the Continuity test record Turn the calibrator output on Verify proper operation for each value in
44. e service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WI
45. ears City State Postal code Calibration Services 1 2 3 4 or 5 years Country Instrument model and serial number Phone Instrument purchase date CD A 9SnAi Table of Contents Specifications Operating Information Theory of Operation General Safety Summary Service Safety Summary Preface Manual Structure Manual Conventions Related Manuals Contacting Tektronix Introduction Service Strategy Service Offerings Before You Begin Specifications css eccles e nhe reed Operating Information Front and Rear Panel Overview Display Indicators Measurement Function Knob Input Connectors Button and Softkey Overview Softkeys Setup Menu Battery Replacement Theory of Operation Performance Verification Adjustment Procedure Adjustment Procedure Options Performance Verification Test Equipments ie eo ine E ER EAR ES Set Pos cons oeste te Edad top detenti sod e t mers Verification Procedure 1 Test Record TX3 Test Record Options and TX3 True RMS Digital Multimeter Service Manual xi xi xi xii 1 1 Ta
46. electrical components read Preventing ESD and Inspection and Cleaning in this chapter Some checks require partial disassembly of the meter Read the Safety Summa ries at the beginning of this manual and then see the section Disassembly and Assembly Procedures in this chapter for instructions NOTE The battery cover must be in place for the meter to operate Refer to the chapter Adjustment Procedure if you replace the circuit board TX1 and TX3 True RMS Digital Multimeter Service Manual Maintenance Check the display for any missing segments MAX MINAVG B BB BO ALULULAL lt gt Zr neg miyFMKOHzng 000500 Beer Bea tup d E HL ULULL 2 84 Be ac oc 5 RC CLR lt The meter is in the function knob and button test mode The first two digits display 01 to 06 05 for TX1 verifying each function knob position contact The last two digits display 01 to 10 verifying each button contact Check each function knob measurement position and each button rt t LU LUUD Function Knob Buttons set at V Figure 7 11 Troubleshooting start Press and hold softkey 2 and turn the function knob from OFF position hold softkey down until meter beeps once No Yes any segments missing No Press softkey 2 again Does No meter beep continuously Yes Pr
47. erating 2 000m 6 562 ft For altitudes from 2 000 m up to 5 000 m 16 404 ft derate voltage input to 600 VAC CAT III Non operating storage 12 300 m 40 354 ft Vibration Operating 2 66 gnus 5 to 500 Hz 3 axes 10 minutes each Non operating 3 48 gnus 5 to 500 Hz 3 axes 10 minutes each 1 and TX3 True RMS Digital Multimeter Service Manual 1 9 Specifications Table 1 22 Certifications and compliances Category EC Declaration of Conformity EMC Standards or description Meets intent of Directive 89 336 E for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official J ournal of the European Union EN 55011 Class A Radiated Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 Electromagnetic Field Immunity 12 1 Add 25 counts 250 counts 50 000 count mode to the accuracy specifications when in the presence of an RF field as defined in IEC801 3 Amps DC Add 60 counts 600 counts in 50 000 count mode to the amps accuracy specifications when in the presence of an RF field as defined in 801 3 Australia New Zealand Decla ration of Conformity EMC Complies with EMC provision of Radiocommunications Act per the following standard s AS NZS 2064 1 2 Industrial Scientific and Medical Equipment 1992 EC Declaration of Conformity Low Voltage U S Nationally Rec
48. ess softkey 2 again Are Yes four digits No displayed All No contacts work Yes and TX3 True RMS Digital Multimeter Service Manual Go to 2 on page 7 20 Inspect LCD for damage Clean LCD contacts and connectors Go to 3 on page 7 21 Goto 3 on page 7 21 Go to 3 on page 7 21 Instrument seems to be working If problems still exist go to the General Troubleshooting tree or you may need to contact your local Tektronix service center 7 19 Maintenance Setthe function knob to any function Is there a brief display Replace batteries and go to Start Here on page 7 19 Are batteries OK Replace batteries Battery connection to circuit board OK Does backlight work No Replace battery assembly Battery cover contacts OK Replace battery cover Press and hold softkey 2 and turn the function knob from OFF position hold softkey down until meter beeps once Press softkey 2 again Does meter beep continuously Replace circuit board Inspect LCD for damage Clean LCD contacts and connectors Figure 7 12 Troubleshooting two 7 20 and TX3 True RMS Digital Multimeter Service Manual Maintenance Set the function knob to any function Go to Start Here on page 7 19 functioning properly Do current functions work
49. external traceable test equipment to test warranted characteristics Alternative test equipment must meet or exceed the intended minimum requirements listed in Table 4 2 If you substitute equipment you may need to modify the procedures NOTE Before beginning the performance verification procedures warm up the test equipment according to the manufacturer s recommendations Table 4 2 Test equipment Description Minimum requirements Example product Universal Calibration Resolution amp accuracy 4 times Wavetek 9100 with 9105 work System greater than the meter display mat lead set reading AC and DC volts measurement AC and DC current measurement Fluke 5500A Resistance measurement Capacitance measurement Sinewave generation Squarewave generation Capacitance Standard Optional Choose 4 wire measurement setup if available 4 2 and TX3 True RMS Digital Multimeter Service Manual Performance Verification Set Up Prepare the meter for the performance verification with the following steps 1 Allow the meter to stabilize at the ambient temperature for one hour before testing 2 Turn the meter on by rotating the function knob to any position other than OFF 3 Warm up the meter for 30 seconds NOTE The auto power off time is adjustable using the setup menu You can disable the auto power off by pushing the HOLD button when turning the function knob from the OFF position
50. g amp index Tektronix Serial no Serial no number part number effective discont d 1 1 431 0474 00 431 0415 00 1 2 354 0749 00 1 3 650 3683 00 1 4 260 2688 00 1 5 426 2562 00 1 6 342 1028 00 1 7 119 5661 00 1 8 131 6346 00 1 9 650 3684 00 1 10 679 4091 00 1 11 131 6560 00 1 12 214 4778 00 1 13 211 0927 00 1 14 650 3682 00 1 15 334 9525 00 1 16 159 0409 00 1 17 348 1616 00 1 18 650 3679 00 1 19 146 0121 00 1 20 650 3680 00 1 21 354 0748 00 1 22 650 3685 00 8 4 Qty 8 description CASE TOP 3 2 X 6 1 X 0 860 P LASTIC TX1 3 20 X 6 10 X 0 860 P LASTIC TX3 O RING O RING KNOB 0 239 X 0 064 SILICONE 5051 W ABS PLASTIC KNOB ASSY TX1 TX3 SWITCH KEYPAD ELAS TOMERIC 2 790 X 2 150 X 200 RUBBER TX1 TX3 BEZEL 2 685 X 2 85 X 0 217 MACROBLEND PLASTIC TX1 TX3 DIFFUSER LIG HT BACKLIGHT 2 0450 X 2 680 PLASTIC TX1 TX3 DISPLAY MODULE LCD CUSTOM DMM S EGMENTED TN 3 0 VOLT 1 4 DUTY VL2572V01 CONN ELASTOMER COMPRESSION STR 280 05 0 008 CTR 0 285H X 2 05L X 0 080W LG180 RUBBER CHASSIS ASSY LCD TX1 TX3 CKT BD SUBASSY TRUE 671 4091 00 UNTESTED 389 2390 00 WIRED TX1 TX3 SPRING CONTACT POGO PIN 0 345 7 02 FORCE ST STEEL GOLD PLATING SPRING EMI 0 015 MUSIC WIRE 0 0003 BRIGHT NICKLE TX1 TX3 SCREW PT K35 1 57 X 10 0MM T10 STL BLACK PHOSPHATE CASE ASSY BOTTOM TX1 TX3 MARKER IDENT BACK LABEL SERIAL NUMBER 0 002 GLOSS WHITE POLYESTER
51. ics Characteristics Description Continuity threshold Beeper sounds when resistance is 100 Q or less typical Response time 1ms Table 1 13 Diode test characteristics Characteristics Description Test current typical 0 35 mA Test voltage 2 8 V maximum open circuit Accuracy 1 0 1 and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 14 Capacitance range resolution and accuracy 5 000 counts only Accuracy Range Resolution 1 TX3 5nF 1 pF 1 0 5 counts using A mode 50 nF 10 pF 1 0 3 counts using A mode 500 nF 100 pF 1 0 3 counts 5 uF lnF 50 uF 10 nF 3 0 3 counts 500 uF 100 nF 5 mF 1 uF 50 mF 10 pF Temperature coefficient Add 0 05 0 1 ct C beyond rated temperature range 1 5 000 count mode only 2 gt 1 of range Table 1 15 Frequency characteristics resolution and accuracy Characteristics Description Signal coupling AC Minimum frequency 0 5 Hz Maximum frequency 1 MHz Accuracy 0 002 1 count Best resolution 10 000 count 0 01 Hz 100 000 count 0 001 Hz Temperature coefficient Add 0 00004 C 2 beyond rated temperature range Table 1 16 Frequency voltage range Range Sensitivity 10 Hz 100 kHz Sensitivity 1 MHz 1 500 mV 100 mV 5V 500 mV 2V 50V 1 and TX3 True RMS Digital Multimeter Service Manual 1 7 1 8 Specifications 1 Characteristics Accuracy Table
52. ion The memory location number momentarily shows on the upper display If no memory locations are available FULL shows on the upper display for two seconds and nothing is stored To overwrite an existing memory value recall the memory location using the RCL button press CLR then press STO to store the new value in this location RCL Select RCL to scroll through the stored values in reverse order The upper display momentarily shows the memory location while the main display shows the value stored in that location CLR Select CLR to clear the currently selected memory location The location is replaced with To clear all memory locations press and hold the CLR button for five seconds A K shows on the display next to the CLR enunciator The word donE shows on the display indicating that all memory locations are clear and you can release the button If you release the button before the word donE shows no data is cleared from the memory EXIT Select EXIT to exit memory mode You can also exit memory mode by pressing any button Each setting on the measurement function knob may activate one or more softkey settings on the LCD If there is more than one measurement for a function knob setting a softkey menu appears on the display Press the corre sponding softkey to select the desired measurement The Setup menu allows you to customize default settings To activate the Setup menu press and hold the blue button for two
53. minimum and maximum limits for each of the values in the volts and frequency test record Turn the calibrator output off Frequency Test Perform the following steps to verify the frequency measurement accuracy 1 4 6 Set the function knob to Hz in the high resolution 50 000 count mode using the following sub steps a Setthe function knob to OFF b Press and hold the BLUE button while setting the function knob to Hz Verify that duty factor mode is off using the following sub steps a If DUTY is displayed in the upper display press and hold the BLUE button for two seconds b Press softkey 4 until POL is displayed in the upper display c Press softkey 1 until OFF is displayed in the main display d Press the BLUE button to exit the setup mode Set the calibrator to the value in the Frequency test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits Turn the calibrator output off 1 and TX3 True RMS Digital Multimeter Service Manual Performance Verification Duty Factor Test Perform the following steps to verify the duty factor measurement accuracy 1 2 Set the function knob to Hz Set the trigger edge polarity to positive using the following sub steps a Press and hold the BLUE button for two seconds b Press softkey 4 until POL is displayed in the upper display c Press softkey 1 until POS is displayed in th
54. nstallation LCD removal and installation Circuit board Circuit board removal and installation Light diffuser removal and installation Function knob removal Figure 7 11 Troubleshooting start Figure 7 12 Troubleshooting two Figure 7 13 Troubleshooting Figure 8 1 Exploded view and TX3 True RMS Digital Multimeter Service Manual 2 1 Table of Contents List of Tables Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 1 7 Table 1 8 Table 1 9 Table 1 10 Table 1 11 Table 1 12 Table 1 13 Table 1 14 General characteristics 1 1 DC voltage characteristics 1 2 DC voltage range resolution and accuracy 1 2 AC voltage characteristics 1 2 AC voltage range resolution and accuracy 1 3 DC current characteristics 1 4 DC current range resolution and accuracy 1 4 AC current characteristics 1 4 AC current range resolution and accuracy 1 5 Resistance Q characteristics 1 5 Resistance range resolution and accuracy 1 6 Continuity characteristics
55. nts 50 000 counts 10A 15 A for 3 minutes Temperature coefficient Add 0 05 0 1 ct C beyond rated temperature range Accuracy in 50 000 count mode is 96 20 counts gt 5 of range Table 1 10 Resistance Q characteristics Characteristics Description Update rate 5 000 ct 2 readings per second 50 000 ct 1 reading per second 50 MQ 1 reading per second Settling time 50 Q to 5 MO range 3 readings typical 50 MQ range 4 readings typical Compliance voltages typical 0 6 V 50 Q and 500 Q range is 1 3 V Common mode rejection ratio 60 dB at DC 50 Hz or 60 Hz Normal mode rejection ratio 20 dB at 50Hz and TX3 True RMS Digital Multimeter Service Manual 1 5 Specifications 1 6 Table 1 11 Resistance range resolution and accuracy Resolution Accuracy Range 5 000 counts 50 000 counts TX1 TX3 500 0 0101 0 1 10 counts 500 Q 010 0 01 Q 0 1 4 counts 2 5kQ 10 010 0 1 2 counts 3 50 100 10 500 1000 100 5 1kQ 100 O 0 496 4 counts 50 10kQ1 1 0 4 counts 2 Temperature coefficient 50 Q to 500 kQ Add 0 03 0 1 ct C beyond rated temperature range 5 MQ to 50 MQ Add 0 2 40 1 ct C beyond rated temperature range 1 5 000 count mode only Accuracy in 50 000 count mode is 40 counts 3 Accuracy in 50 000 count mode is 96 20 counts Table 1 12 Continuity characterist
56. o the following tasks before you attempt service m Read Safety Summary found at the beginning of this manual m Read Service Strategy in this section When using this manual for servicing be sure to read and follow all warnings cautions and notes xii and TX3 True RMS Digital Multimeter Service Manual EUR MEM SM Specifications Specifications specifications are warranted unless noted as typical for the rated tempera ture range of 23 5 C at less than 80 relative humidity Table 1 1 General characteristics Characteristics LCD display digits Display counts Bargraph Memory locations Outof range indicator Low voltage indicator Battery life Auto off Description 34 default or 446 5 000 default or 50 000 20 segment updated 20 times per second TX1 10 TX3 30 OL overrange Ur underrange Battery symbol shows on LCD at 2 0 V Meter powers down at 1 5 V 100 hours continuous use with backlight off typical Adjustable 30 minute default Power source Two AA 1 5 V alkaline batteries IEC LRG or ANSI NEDA 15A Maximum input voltage be tween terminals and between terminals and earth 1000 Installation Category III CAT III 1 Maximum open circuit voltage when utilizing the A terminal 600 CAT Ill Overload protection V terminal 1000 Vrms 1500 Vy for all functions F1 fuse protection 15 A 1000 V fast
57. ognized Testing Laboratory Listing Canadian Certification Additional Compliance Compliance was demonstrated to the following specification as listed in the Official J ournal of the European Union Low Voltage Directive 73 23 EEC amended by 93 69 EEC EN 61010 1 A2 1995 Safety requirements for electrical equipment for measuring control and laboratory use UL3111 1 Standard for electrical measuring and test equipment CAN CSA C22 2 No 1010 1 Safety requirements for electrical equipment for measurement control and laboratory use 1 61010 1 2 1995 Safety requirements for electrical equipment for measurement control and laboratory use 1 10 1 and TX3 True RMS Digital Multimeter Service Manual Specifications Table 1 22 Certifications and compliances cont Category Installation Category Descriptions Pollution Degree Standards or description Terminals on this product may have different installation overvoltage category designations The installation categories are CAT Ill Distribution level mains usually permanently connected Equipment atthis level is typically in a fixed industrial location CAT Il Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CAT I Secondary signal level or battery operated circuits of electronic equipment A measure ofthe contaminates that coul
58. on AC DC 1 dual display accuracy DC Accuracy 0 0596 1 count AC RMS Accuracy 0 1 1 count Upper display frequency 5 000 counts Accuracy 0 002 1 count for 20 Hz to 20 kHz Sensitivity 1096 of selected voltage range dB reference 1 Vnus adjustable dBm reference 715 mV across 600 1 mW 1 5 000 count mode only 2 dB readout 20 x log main display readout ref where ref 1 V is the default dBm readout 10 x log main display readout2 R where R 600 Table 1 5 AC voltage range resolution and accuracy Resolution Accuracy 1 Range 5 000 counts 50 000 counts TX3 0 5 V 40 Hz 20 kHz 40 Hz 20 kHz 0 6 2 0 4 2 5V counts counts 50V 500 V2 1000 V 2 40 Hz 10 kHz 40 Hz 10 kHz 0 6 2 0 4 2 counts counts Temperature coefficient AC Add 0 03 0 1 ct C beyond rated temperature range AC DC Add 0 06 0 1 ct C beyond rated temperature range Accuracy in 50 000 count mode is 96 20 counts For voltages gt 100 V the maximum volts Hz product is lt 10 MVHz and TX3 True RMS Digital Multimeter Service Manual 1 3 Specifications Table 1 6 DC current characteristics Characteristics Burden voltage Percent 4 20 mA calculated in 50 mA range Settling time Reading rate Description 5 mA to 5 A 0 3 V max 10 A 0 5 V max 4 mA lt 096 20 mA 10096 4 readings typical 5 000 ct 4 readings per se
59. personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Symbols and Terms Terms in this Manual These terms may appear in this manual in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property WARNING Warning statements identify conditions or practices that could result and TX3 True RMS Digital Multimeter Service Manual V General Safety Summary vi Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product CAUTION WARNING Double Referto Manual High Voltage Insulated 1 and TX3 True RMS Digital Multimeter Service Manual amp Service Safety Summary Only qualified personnel should perform service procedures Read this Service Safety Summary and the General Safety Summary before performing any service procedures Do Not Service Alone Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and re
60. r Service Manual Operating Information Display Indicators T 5 Mas LE EI 1 OED maFMKOHzmyAZE 7 inii inii ea 10 3 h m skHz umm MAX MINAVG HH nm dBmVA v 2 7 1 _ 9 c 112 EE RCE Rd EXITOK 1 Special feature indicators 6 Upper display 2 Low battery indicator 7 Upper display units 3 Delta indicator 8 Main display 4 Blue button and memory 9 Main display units mode indicators 10 Range indicators 5 Bargraph 11 Softkey menus Figure 2 3 Display indicators and TX3 True RMS Digital Multimeter Service Manual Operating Information Measurement Function Knob gt I N o Oo e TX1 TX3 Figure 2 4 Measurement function knob OFF Turns off the meter Setup parameters and stored measurements are saved V Volts AC RMS Volts DC Volts AC DC dual display Volts total RMS dB and dBm Hz Frequency measurements Duty factor also shows if it is turned on in the Setup menu Access to resistance and continuity measurements and diode test 4 Capacitance measurements C Temperature measurements in degrees Celsius or Fahrenheit Amps AC RMS Amps DC Amps AC DC total RMS Amps AC DC dual display and Amps DC 4 20 mA process control loop me
61. r can create a shock hazard In rare cases the interior of the meter may require cleaning Clean the interior by using the disassembly procedures in this chapter Use a soft lint free cloth dampened with water If more efficient cleaning of the LCD contacts and function knob contacts on the circuit board is required a 75 isopropyl alcohol solution can be used If the meter is exposed to water open the case and allow the meter to fully dry To open the meter use the procedure in the Disassembly Assembly Procedures section Before reassembling the meter check that all seams battery compart ment and input connectors are dry There is no periodic lubrication required TX1 and TX3 True RMS Digital Multimeter Service Manual Maintenance Disassembly and Assembly Procedures The following procedures are ordered in the logical sequence of disassembly You will usually need to start from the beginning and continue until you reach the objective Reassemble the meter by following the procedures in the reverse order Use the exploded view of the meter on page 8 5 as an overall guide in both the disassembly and assembly of the meter Table 7 2 List of tools Flatblade screwdriver 10 Torx tip screwdriver CAUTION The internal components and contacts are adversely affected by skin oil Take precautions to avoid direct skin contact when performing these procedures Refer to Internal Cleaning Procedures on page 7 4 if you need
62. rategy is in this section Theory of Operation contains circuit descriptions down to the module level Performance Verification contains a collection of procedures for confirming that the multimeters function properly and meet warranted limits Adjustment Procedure informs you how to obtain calibration services Options lists the available options for the TX1 and TX3 meters Maintenance contains information and procedures for doing preventive and corrective maintenance This includes cleaning instructions and disassembly and assembly instructions Replaceable Parts includes a table of all replaceable parts their descriptions and their Tektronix part numbers 1 and TX3 True RMS Digital Multimeter Service Manual ix Preface Manual Conventions Safety Symbols Related Manuals Contacting Tektronix This manual uses certain conventions which you should become familiar with before doing service Symbols and terms related to safety appear in the Safety Summary found at the beginning of this manual Refer to the Safety section in this manual to learn about the symbols used in this manual The TX1 and TX3 digital multimeters are shipped with a user manual Refer to the user manual for detailed operating instructions Product Support Service Support For other information To write us For application oriented questions about a Tektronix measure ment product call toll free in North America 1 800 TEK W
63. revent malfunction and enhance its reliability Preventive maintenance consists of periodic inspection and cleaning and using general care when operating How often to do maintenance depends on the severity of the environment in which the meter is used A proper time to perform preventive maintenance is just before adjustment General Care boot helps protect the meter from damage due to bumps and drops It s recommended to leave the boot on during normal use of the meter The case keeps out dust and moisture and should be in place when ever operating the meter Protect the meter from adverse weather conditions Do not expose the LCD display to direct sunlight for long periods of time 1 and TX3 True RMS Digital Multimeter Service Manual 7 3 Maintenance Inspection and Cleaning 7 Procedures AN A Internal Cleaning Procedures Drying Procedure Lubrication Inspect and clean the meter as often as operating conditions require Clean the exterior of the meter by removing dust with a lint free cloth Use care to avoid scratching the clear plastic display filter For further cleaning use a soft cloth or paper towel dampened with water You can use an alcohol free glass cleaner for more efficient cleaning CAUTION To avoid damage to the surface of the meter do not use abrasive or chemical cleaning agents WARNING The meter is not protected from exposure to water Exposing the meter to wate
64. seconds Use the softkeys as shown in the following table to edit setup values Setup menu values are saved when you turn off the meter except for reference values 1 and TX3 True RMS Digital Multimeter Service Manual Operating Information Helpful Tip Increased Temperature Accuracy Press to save set ting and move to next setup parame ter Press to decrease setting value Press to increase setting value Function Press to step to next digit in setting value The following table lists the setup menu prompts the definition of parameters and default values Table 2 1 Setup prompts definitions and default values Upper dis Definition of parameter Default play prompt press OK to cycle through parameters value POFF Sets auto off time in minutes 30 minutes LOFF Sets backlight auto off time in seconds 60 seconds bEEP Toggles beeper on and off ON HrES Changes display to 50 000 counts OFF POL Duty Scrolls through OFF POS positive duty factor and OFF NEG negative duty factor EdGE Hz Toggles between POS positive edge and NEG Positive rising negative edge triggering in Hz measurement rEF Changes the reference value for delta measurements Value before A button is pressed A rERdB Changes the reference value for dB measurements 1V 1 Meter must be in or dB mode to access these setup parameters To achieve high accuracy temperature measurements to 1
65. specified Display minimum and maximum limits for each of the values in the AC volts test record 7 Turn the calibrator output off Perform the following steps to verify the AC voltage frequency measurement accuracy 1 Setthe function knob to V Press softkey 1 to select AC default setting Connect the calibrator outputs to the meter V and COM input connectors Set the calibrator to the first value in the AC volts frequency test record Turn the calibrator output on mU Verify that the meter reads within the specified Display minimum and maximum limits for each of the values in the AC volts frequency test record 7 Turn the calibrator output off Perform the following steps to verify the DC volts measurement accuracy 1 Setthe function knob to V in the high resolution 50 000 count mode using the following sub steps a Setthe function knob to OFF b Press and hold the BLUE button while setting the function knob to V 2 Press softkey 2 to select DC 1 and TX3 True RMS Digital Multimeter Service Manual Performance Verification Set the calibrator to the first value in the DC volts test record Turn the calibrator output on Verify that the meter reads within the specified Display minimum and maximum limits for each of the values in the DC volts test record Turn the calibrator output off Volts Peak Hold Test Perform the following steps to verify the DC volts peak measurement accuracy 1
66. ss the input impedance is measured Chip A works with the attenuator and input conditioners to transform the signal to levels appropriate for chip B Chip A has multiple inputs and three outputs A 0 5 V analog signal is sent to chip B for analog to digital conversion Chip B does the analog to digital conversion provides all calculations and sends the digital signals to the microprocessor The microprocessor controls chips A and B and all relays upon receiving commands from the function switch and buttons or the infrared PC interface port The liquid crystal display is a 160 segment dual display capable of displaying 50 000 counts in the main display and 5 000 counts in the upper display The backlight is provided by LEDs located on the circuit board TX1 and TX3 True RMS Digital Multimeter Service Manual 3 1 Theory of Operation A D Converter Digital Digital register register as Display 160 segments feb e To chip 050 0 005 Q COMM e Figure 3 1 Simple block diagram S witch and 5 push 10 buttons yes 97 e 77 5 _ _ _ LOE 1 ck lt lt AMPS gt e o
67. suscitation is present Use Care When Servicing With Power On Dangerous voltages or currents may exist in this product Disconnect power remove battery if applicable and disconnect test leads before removing protective panels soldering or replacing components To avoid electric shock do not touch exposed connections 1 and TX3 True RMS Digital Multimeter Service Manual vii Service Safety Summary viii 1 and TX3 True RMS Digital Multimeter Service Manual Preface This section contains information needed to properly use this manual to service the TX1 and TX3 True RMS Digital Multimeters as well as general information critical to safe and effective servicing of multimeters Manual Structure This manual is divided into chapters such as Specifications and Theory of Operation Further it is divided into subsections such as Product Description and Disassembly and Assembly Procedures Sections containing procedures also contain introductions to those procedures Be sure to read these introductions because they provide information needed to do the service correctly and efficiently The following is a brief description of each manual chapter Specifications contains a product description and tables of the characteristics and descriptions that apply to it Operating Information includes general information and operating instruc tions at the level needed to safely service the multimeters A statement of the service st
68. the backlight timeout setting Use the Setup menu information on page 2 8 to adjust the setting for the backlight 1 and TX3 True RMS Digital Multimeter Service Manual Operating Information HOLD Button Press HOLD to turn hold mode on and off When you activate the hold feature the meter beeps freezes the display and displays the indicator Hold mode freezes the display so you can remove the probes from the test points without losing the measurement reading Auto Hold activate auto hold press down on the HOLD button until appears on the display Auto hold is not available for capacitance or AC DC measurements In auto hold mode the display automatically freezes and the meter beeps when the measurement reading stabilizes The displayed value will be updated when the meter stabilizes on a new measurement value Auto hold is useful when it is not possible for you to press the HOLD button or see the meter display while probing and taking measurements A Button Making Relative Use this button to set the meter to delta A mode and make relative measure Measu rements ments The reference value for the A measurement can be a measured a stored or a programmed value A Relative to a Measured Value When you take the measurement and the meter settles on the measurement value press the A button For subsequent readouts the measured reference value is subtracted from the actual measurement A Relative to a Saved Value Use
69. tton Use to set meter to MIN MAX AVG or 1ms modes 6 Softkeys Use with measurement function knob to select measurements 7 Backlight Button Use to turn backlight on and off 8 HOLD Button Use to freeze display 9 A Button Use to make relative measurements and access the memory 10 Input connectors Figure 2 1 Front panel overview and TX3 True RMS Digital Multimeter Service Manual 2 1 Operating Information EE PRESS amp HOLD OPTIONS Press amp Hold for 2 seconds RANGE Auto RANGE HOLD Auto HOLD BLUE Setup Menu POWER UP OPTIONS Press amp Hold While Turning Meter RANGE 500mV High Impedance O 1 sec HOLD Disable Auto Off lt 2 Tum Beeper OFF BLUE High Res 50 000 Counts LIGHT Disable Light Timeout CAUTION O 1 5V AA 2 15A wa PEN NK 3 HF F1 15A F 1000V D TEKTRONIX INC BEAVERTON OR U S A Made in U S A To replace batteries or fuse remove cover 1 Press and hold options Activate by holding down the specified button two seconds while the meter is on 2 Power up options Activate by holding down the specified button while turning on the meter 3 Compliance and battery and fuse replacement information 4 Serial number and barcode tag 5 Removable battery cover Figure 2 2 Rear panel overview 1 and TX3 True RMS Digital Multimete
70. until the knob assembly snaps apart CAUTION Take extreme care not to damage the contacts on the clicker This will need to be replaced if the contacts are bent 1 and TX3 True RMS Digital Multimeter Service Manual 7 15 Maintenance 7 16 Screwdriver Knob assembly Supports Figure 7 9 Function knob removal Installation 1 Place the function knob into the top case half Place the knob so that it is able to rotate to all functions Ensure that the o ring is in place on the function knob 2 From inside the case half place the clicker onto the function knob use the key for alignment and press down until it snaps into place 1 and TX3 True RMS Digital Multimeter Service Manual Function knob Figure 7 10 Function knob and switch keypad installation 1 and TX3 True RMS Digital Multimeter Service Manual 7 17 Maintenance Troubleshooting A Adjustment After Repair 7 18 This section contains a troubleshooting tree divided into three sections to help isolate problems to the most probable cause In most cases the easiest method to use the trees is to begin with the first tree at Start Here WARNING Before doing this or any other procedure in this manual read the General Safety Summary and Service Safety Summary found at the beginning of this manual Also to prevent possible injury to service personnel or damage to
71. vements to the product as well as the latest options to the product Tektronix warrants this product for three years from date of purchase The warranty appears after the title page and copyright page in this manual Tektronix technicians provide warranty service at most Tektronix service locations worldwide Your Tektronix product catalog lists all service locations worldwide The following services may be purchased to tailor repair and or calibration of your TX1 and TX3 True RMS Digital Multimeters to fit your requirements At Depot Service Tektronix offers several standard priced adjustment calibra tion and repair services A single repair and or adjustment m Calibrations using equipment and procedures that meet the traceability standards specific to the local area Annual maintenance agreements that provide for either calibration and repair or calibration only 1 and TX3 True RMS Digital Multimeter Service Manual xi Introduction Of these services the annual maintenance agreement offers a particularly cost effective approach to service for many owners Such agreements can be purchased to span several years Self Service Tektronix supports self service repair by providing replaceable parts See the Replaceable Parts chapter for a list of all replaceable parts Before You Begin This manual is for servicing the TX1 and TX3 True RMS Digital Multimeters To prevent injury to yourself or damage to the meter d
72. with the TX Series True RMS Digital Multimeters because accuracy specifications vary in different types of probes NOTE Observe proper polarity on the probe adapter and do not calibrate the offset immediately following high amperage measurements Batteries 2 AA alkaline or rechargeable Figure 2 6 Battery replacement When you replace a battery the meter calibration is not affected and the stored data is not lost Remove the battery cover only in a clean dry environment See the Specifications chapter for the description and part numbers of the replaceable batteries 1 and TX3 True RMS Digital Multimeter Service Manual W Theory of Operation Theory of Operation General Description Signal Conditioning A Chip B Chip Microprocessor LCD This chapter provides a simple operating diagram of the TX1 and TX3 meters using the major circuit blocks As illustrated with the block diagram the TX1 and TX3 meters have five main elements in the signal path m Signal conditioning A chip m B chip Microprocessor m Display The attenuators compensated with parallel capacitors condition divide the input signal to a level appropriate for the ICs The conditioning includes transforming all inputs to voltage The current shunts selected by FET switches provide the correct voltage drops For ohms and capacitance the inputs are configured as current sources and the voltage drop acro

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