Manual - Test Equipment Depot
Contents
1. 7 Scroll through the V O P value between 1 0 and 99 9 by using the lt 4 A and Y buttons to find the required V O P value 8 Press the OK button to set the Meter to the required V O P value 9 Connect the cable to be tested to BNC connector of the Meter 10 Press the TEST button to take the required measurements For example the Meter can have the following display 13 4 4 How to determine unknown V O P settings The Calibrate Cable function allows you to determine the V O P for a known length of cable and save itfor additional measurements of unknown lengths of the same type of cable V O P settings are stored in nonvolatile memory NOTE Lengths measurements are only as accurate as the V O P setting for the cable to be measured V O P values can vary substantially between cable manufacturers as well as between cable lots Measure and record the V O P of a sample length of cable for each cable manufacturer then mark the V O P on each cable drum before installation To calibrate a cable manually perform the following steps 1 Take a sample of the cable at least 30 ft 10 m in length to obtain the specified accuracy longer lengths improve accuracy 2 Measure its length by direct measurement 3 Repeat the step 1 tostep 5 of Section 4 3 3 then press the A button or the Y button in order to set the Meter to the Calibrate Cable function when the 5 will appear replacing the gap and 30 00 will be2. with Sk check the cable under test for a short circuit at less than 15 ft 6 m or check that terminators have been removed from network If the distance to a short circuit is beyond the specified range of the Meter check again by reconnecting the Meter to the opposite end of the cable under test if possible If the display is blank check if the batteries are properly connected to the Meter or replace the batteries If a cable length measurement appears to be inaccurate check that the cable type or the V O P value has been correctly selected or check if conductors within cable are broken 26 10 Specifications Maximum Range Range Selection Resolution Accuracy Depends upon the V O P of the cables under test 12 000 ft 3 7 km V O P lt 99 9 9 800 ft 3 0 km V O P lt 80 0 8 000 ft 2 4 km V O P lt 66 0 6 200 ft 1 9 km V O P lt 50 0 Automatic range control 20 inches 50 cm 2 of reading 20 in 50 cm lt 300 ft 100 m 2 of reading gt 300 ft 100 m The accuracy is effective for Coaxial Cables up to 8 000 ft Telephony Cables up to 6 000 ft and Structured Wiring up to 3 000 ft Output Impedance Impedance Selection Velocity Factor Cable Library Memory Location Connector Type Display Power Supply Batte ry Life Operating Temperature Storage Temperature Relative Humidity Dimensions 25 50 75 100 125 or 150 ohms Automatic output impedance
3. blinking to let you remind that the length of a sample cable should be at least 30 ft 10 m wn SPL _ at mae ee eee 4 Connect the sample cable to the Meter and set the actual length of the sample cable using the lt 4 A and Y buttons 14 5 Press the OK button 6 Press the TEST button to read the V O P of the sample cable when the center line segment of 6 digits will blink waiting for the next measurement For example els eee ee eee eee eee eee blinking 7 Connect the cable to be tested to the Meter 8 Press the TEST button to take the required measurement 4 4 1 Expanding cable library for custom cable types using nonvolatile memory The nonvolatile memory of this Meter allows you to store V O P values measured in Section 4 4 to expand the cable library up to 20 custom cable types Use the memory mode to store and recall the measured V O P values Press the MEMORY button momentarily in order to activate the memory mode The display shows three menu selections STORE RECALL and CLEAR For example if the below display was obtained in Section 4 4 Fig 10 15 STORE This Meter has 20 internal memory locations from 01 to 20 Press the STORE button to store the next available memory location when the memory locations has been partially occupied Then the MEM symbol will appear and the currently available location number will be blinking For example if the location 04 was occup
4. protected against telephone networking voltages EN 60950 1999 Sec 2 3 Connection to any mains supply voltages may result in damage to the Meter and or a hazard to the user Hence the user must assume responsibility for ensuring his or her own safety International Symbols used on the Meter AB Caution Refer to the explanation in this manual Gl Double insulation or Reinforced insulation Battery CE Meter complies with current EU Directives International Standards Safety IEC 1010 1 2001 EMC EN 61326 1997 A 1998 EMC Standard ategory of Pass ESD IEC 1000 4 2 EM IEC 1000 4 3 A Burst ECi004F fT COCASC Sd Surge IEC 1000 45 A Conducted RF IEC 1000 4 6 PUA The Meter is a handheld and battery operated instrument capable of measuring cable lengths and finding distance to an open or a short using TDR Time Domain Reflectometry techniques given access to one end only The Meter can be used for any cable consisting of at least two insulated metallic elements one of which may be the sheath or shield of the cable The Meter has automatic internal matching networks to allow testing of 25 Q 50 Q 75 Q 100 Q 125 Q or 150 Q cables which correspond to power telephony CATV and LAN etc cables The Meter can be closely matched to the cable under test using the menu selection keys The V O P Velocity of Propagation value can be similarly adjusted to match the cable under test thus ensuring an accurate di
5. the Meter is turned off it automatically stores the last setting and will display this setting when powered up 10 gt 3 2 Cable library for 39 standard cable types SPECIFICALLY IDENTIFIED CABLE Q 1 Lucent 1024 006ABE 6 24 W1 000 6 pair CAT 3 Blue White BICC General Aerial Service Wire ASW 2 22 2 Pair Drop Wire Superior Essex 4 Pair CATS i Plenum not pair depen 24 AWG CMX Outdoor CRM Station Wire E Q 05 a lenum dent CanmScope Drop SS fAGsoTVGom id ge White 07 Orange White 10 e 5571 RG59 TV Coax 12 13 14 15 88760 2 wire shielded 18AWG Red Black Shield ICC General E22025 Red Black hanne Master Polyclad Mode 9354 300 Ohm Foam Antenna Wire riangie Wire and Cable type NM 8 12 2 W G Black Ground riangie Wire and Cable type NM B 12 2 W G Black White elden Drop Foam CommScope Drop on N 73 7 7 a 3 j Nino RG59 TV Coax j imes Fiber Trop imes Fiber Dynatoam imes Fiber Trunk tolgy Trunk wisted Pair Gel Filed 19 AWG wisted Pair Gel Filed 22 AWG wisted Pair Gel Filled 24 AWG wisted Pair Gel Filed 26 AWG wisted Pair Paper 22 AWG wisted Pair Paper 24 AWG wisted Pair Paper 26 AWG wisted Pair PIC 19 AWG wisted Pair PiC 22AWG wisted Pair PiC 24AWG 39__ TwistedPairPIC26AWG 27 87 93 oe j j o nm 4 37 67 io gt f5557 bd rb bd2rbS CC i 56 b Erb CA9354 tolbG tulbu bddroP CSdroP C
6. Megger Test Equipment 99 Washington Street Depot Melrose MA 02176 Phone 781 665 1400 1 800 517 8431 Toll Free 1 800 517 8431 Copyright 2003 Fine Instruments Corp All right reserved Specifications subject to change without notice Litho in Korea Megger Time Domain Reflectometer Megger TDR900 CE egger 900 USER S MANUAL WARNING SOURCES LIKE SMALL HAND HELD RADIO TRANSCEIVERS FIXED STATION RADIO AND TELEVISION TRANSMITTERS VEHICLE RADIO TRANSMITTERS AND CELLULAR PHONES GENERATE ELECTROMAGNETIC RADIATION THAT MAY INDUCE VOLTAGES IN THE TEST LEADS OF THE MULTIMETER IN SUCH CASES THE ACCURACY OF THE MULTIMETER CANNOT BE GUARANTEED DUE TO PHYSICAL REASONS Basic Specifications Maximum Range Range Selection Resolution Accuracy Depends upon the V O P of the cables under test 12 000 ft 3 7 km V O P lt 99 9 9 800 ft 3 0 km V O P lt 80 0 8 000 ft 2 4 km V O P lt 66 0 6 200 ft 1 9 km V O P lt 50 0 Automatic range control 20 inches 50 cm 2 of reading 20 inches 50 cm lt 300 ft 100 m 2 of reading gt 300 ft 100 m X This accuracy is effective for Coaxial Cables up to 8 000 ft Telephony Cables up to 6 000 ft and Structured Wiring up to 3 000ft Output Impedance Impedance Selection Velocity Factor Tone Generator Cable Library Memory Location Connector Input Protection 25 50 75 100 125 or 150 ohms Autom
7. StrUn 7 GS8Un cOSStu SEru Ie tFtraP tFdnR tFtrUn ttrUn tPGF 19 tPGFe2 tPGFE4 tPGFeb tPPree tPPrey tPPreb EPEN EP Cee tP 24 NOMINAL ABBREVIATION V 0 P FOR DISPLAY EP Leh 11 4 3 3 Testing cables not included in library If the cable type to be tested is not in the library it can still be tested if the V O P is known If the V O P is unknown refer to Section 4 4 1 Tum the Meter on 2 The Meter will display the previously selected cable setting see Initial Display of Section 3 1 with its V O P 3 Press the SELECT button then the Meter will display both the LIBRARY symbol blinking and the V O P symbol see Fig 3 4 Press the Y button then the LIBRARY symbol will stop blinking and the V O P symbol will be blinking 5 Press the OK button to set the Meter to the V O P adjusting mode when the LIBRARY symbol will disappear the V O P symbol will stop blinking and the pn segments will start to blink mti ie a aannam o a ea O OGO O D Xx The Meter can enter into the Calibrate Cable function to determine the V O P for a known length of cable by pressing any button out of A and Y buttons when the Meter is in the V O P adjusting mode Then the Py will appear replacing the EF and 30 00 will be blinking to alert the user that a sample cable longer than 30 ft 10 m is necessary 12 6 Press the OK button again then the default V O P value of 66 0 will start to blink
8. atic output impedance control Adjustable from 1 0 to 99 9 Oscillating 810 1100 Hz 5 Ve unloaded 39 standard cable types 20 for custom cable types BNC 250 V RMS Line Voltage Detection 6 5 V AB Warning The product should not be connected to any energized circuits Connection to mains supply voltages will damage the Meter and could be hazardous to the user The product contains parts that can be damaged by static discharge Discharge the cable to be tested before connecting the product to the cable Read Safety Information before using this Meter CONTENTS 1 Safety Information v ssssssesssessssesseesssssssenssscensenssssssssn meeeiaesensensssssassns sees 3 2 The TDR Cable Length Meter s sssssssssssssssssesssseensssssnssnvsernsesrescensensassnnseny 4 3 Controls Indicators and Buttons Overview 5 4 Meter Operation ssssseseeseessessseessssssnnensmeeneceereeeessonsannanernteetreeeensensassanseny 8 4 1 Principles Of Operation s sssse eeeescccseeeesssssseen ie eeceeeeseeessnsannnnineenteeereneenset 8 4 2 How to connect a cable to the Meter vestsesstseseeuse rersserenssnrensenrnnsenrene 8 4 3 How to set the cable type vsssssesssssssssseessesssssssvsnsseseeseceensensesssnssnvseensarreneensen 9 4 3 1 Selecting a library cable type sssssssssssessseeseeeensessssssneersetseeeensen 9 4 3 2 Cable library for 39 standard cable types seere reesei 10 4 3 3 Testing cables not i
9. be picked up with a standard tone probe not supplied available in the marketplaces This facilitates cable tracing To select Tone Generator mode turn the Meter off then press the TONE button for more than 1 second The message tant fev will appear on the display To resume normal operation press the EXIT button 8 5 Line Voltage Detection mode The Meter displays gy gr message and stops operation if line voltage of the cable under test exceeds 6 5 V when the Meter is turned on 25 9 Maintenance Battery The Meter requires 4 LR6 AA type 1 5 vot alkaline batteries When the batteries need being replaced the Meter displays J in the upper display refer to Section 8 To replace the batteries turn the meter off remove the battery cover and replace the batteries installed in the battery holder Ensure the battery cover is refitted Trouble shooting If the Meter displays Er in the lower display check the length of cable under test is within the specified range of the Meter or check connections from the Meter to the cable under test or check if there is an open circuit in cable at less than 15 ft 5 m To check the Alligator clip adaptor connect two Clips together and press the TEST button If the meter displays Mr with GE the Alligator Clip adapter is OK If the Meter displays p with fF the adaptor needs being replaced or repaired If the Meter displays GLE
10. control Adjustable from 1 0 to 99 9 in 0 1 step 39 standard cable types 20 for custom cable types BNC ICON type 7 segment LCD Backlight stays on for 1 minute when activated 4 LR6 AA type 1 5 volt alkaline batteries Approx 5000 tests 0 F to 140 F 18 C to 60 C 4 F to 158 F 20 C to 70 C 85 at 95 F 35 C 9 25 H x 3 94 W x 1 73D in 235 H x 100 W x 44 D mm 27 Weight Protection Safety EMC 28 Approx 16 oz 450 g Overvoltage protection against telephone network voltages EN 60950 1999 Sec 2 3 IEC 1010 1 2001 EN 61326 1997 A1 1998 CE Certificated The Meter contains statically sensitive devices and is not user serviceable If a unit fails or its protection has been impaired it should not be used and sent for repair by suitably trained and qualified personnel New Meters are guaranteed for 1 year from the date of the user s purchase For service requirements contact the distributor from whom the Meter was originally purchased Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com
11. f the memory location 01 and the 01 blinking Select the required memory location number using the 4 A and Y buttons Press the OK Eb button to exit the memory mode when the lower display will show S i E while the Meter is performing CLEAR function For example if the V O P of the memory location 05 would be required to be erased the Meter will display as follows 55Sa Press the CLEAR button to complete the CLEAR function X If you want to cancel this CLEAR function press the EXIT button again to exit the memory mode Completing the CLEAR function the Meter will show the same display as that which the Meter showed just before entering into the CLEAR function If the MEMORY button is depressed while the Meter is performing the memory mode the Meter will return to the previous mode where the Meter was set before entering into the memory mode e When the memory location 01 02 03 and 05 were occupied and the memory location 04 was unoccupied the STORE function stores the data from the memory location 04 18 4 5 How to measure cable length 1 Set the cable type or the V O P for the cable to be measured 2 Connect the Meter to the cable as described in Section 4 2 3 Press the TEST button e f there are no shorts in the cable the length of the cable will be displayed in the lower display with in the upper right display e If there is a shortin the cable the distance to the short will be d
12. gth measurement by measuring a sample cable longer than 30 ft or 10 m of the same cable type you will be testing 4 2 How to connect a cable to the Meter e Ensure that no power supply or equipment is connected to the cable to be tested Ensure that the far end of the cable to be tested is either open or shorted not fitted with a terminator e Connect the Meter to one end of the cable to be tested The cable connection to the Meter is via a BNC connector located at the top of the Meter For unterminated cables use the Alligator Clip adaptor as follows Coaxial cable Connect the red clip to the center wire and the black clip to the shield Shielded cable Connect the red clip to a wire adjacent to the shield of the cable and the black clip to the shield Unshielded twisted pair cable Separate one pair out and connect the two clips to the two wires of a pair Unshielded multi core cable Connect the two clips to any two wires 4 3 How to set the cable type The Meter needs to be set for the cable type to be tested before being used to take measurements If the cable type is listed in the library setting up is simply a matter of selecting the appropriate cable type from the library 4 3 1 Selecting a library cable type The library cable type you will select determines the information about V O P and the abbreviated trade name of the cable to be tested 1 Turn the Meter on 2 The Meter will display the prev
13. hes to reduce crosstalk 22 8 1 Low battery indication The Meter displays in the upper display to indicate the status of low battery Replace the batteries immediately Never leave a weak or dead battery in the Meter Even leak proof types can leak and damage the Meter Forexample Fig 16 8 2 Overrange indication The Meter will display jEr in the lower display if the TEST button will be depressed when BNC of the Meter is improperly connected to either a cable tobe tested or Alligator Clip adaptor or when no cable is connected to the Meter Forexample Se ee DUE tee eee Fig 17 23 8 3 Enable or disable the auto power off mode You can customize the required default setting between Enable and Disable settings by pressing the POWER button for about 2 seconds during the a button being depressed when the Meter will display AEP in the upper display and g BA in the lower display Fig 18 e If you want to disable the auto power off mode during your taking measurements press the OK button e f you want to enable the auto power off mode press either the A button or the V button when the Meter will display Enb replacing 4 EA in the lower display and then press the OK button to return to the auto power off mode 24 8 4 Tone Generator mode The Meter generates an oscillating 810 1100 Hz tone which is transmitted down the cable under test and can
14. ied the display shows as the Fig 11 ns _ blinking z b r x iiia eee P Fig 11 When all the memory locations are not occupied the V O P segments will display sm A particular memory location can be selected using the 4 A and Y buttons Press the OK button to prepare storing the V O P value measured in Section 4 4 in the location 05 Then the display shows as the Fig 12 Press the STORE button then the Meter will display blinking SRE while the measured V O P is being stored The Meter will display replacing SRUE after the V O P has been stored 16 Xx If you want to cancel storing the V O P setting press the EXIT button to have the Meter exit memory mode RECALL Select RECALL to review the stored value pressing the RECALL button after having the Meter enter into the memory mode The upper display will show the V O P value of the memory location 01 and the 01 blinking Select the required memory location number using the 4 A and Y buttons Press the EXIT button to exit the memory mode For example if the memory location 05 would be selected the Meter will display as follows x If you want to cancel this RECALL function press the EXIT button again to exit the memory mode 17 CLEAR Select CLEAR to erase the stored value pressing the CLEAR button after having the Meter enter into the memory mode The upper display will show the V O P value o
15. iously selected cable setting see Fig 1 and Fig 2 with its V O P 3 Press the SELECT button then the Meter will display both the LIBRARY symbol blinking and the V O P symbol blinking ino So LIBRART i a Fig 3 O 5 Be 4 Press the OK button to set the Meter to the LIBRARY mode The Meter will display the information of the LIBRARY No 1 when the 9 will be blinking LIBRART 5 un n te blinking i O 5 D 6 5 Scroll through the library using the 4 A and W buttons to find the required cable type The types are displayed in the Library Number order The 39 standard cable types are listed in Section 4 3 2 and Section 4 3 3 will explain you how to make the library of 20 customer cable types using the memory mode 6 Press the OK button to set the Meter to the required cable type x The center line segments of 6 digits in the lower display will be blinking until the TEST button will be depressed 7 Connect the cable to be tested to BNC connector of the Meter 8 Press the TEST button to take the required measurements X The displayed V O P will be remained on the LCD even after the TEST button was depressed in order to inform the user of the V O P of the cable to be tested x When the Meter will be continuously set to the just same cable type as the preceding cable type the Meter will show the preceding display until the TEST button will be newly depressed When
16. isplayed in the lower display with S in the upper right display Ifthe cable is beyond the measurement range the display will show fe in the lower display 4 6 How to check networks Thin Ethernet While performing the following tests no equipment should be connected to the network 1 Setthe Meter for a network cable type e g Ethernet 9880 2 3 4 Press the TEST button The length of the network will be displayed in the lowerdisplay with fe Remove 50 terminators from both ends of network 1 2 3 Connect the Meterto one end of the network 4 5 Repeat steps 3 and 4 from the other end of the network e If the length shown is just same from either end this length indicates the total length of the network e If the lengths are differ and are less than the expected this is probably due to an open circuit in the network at the distance displayed e If the length is displayed in the lower display with g this indicates that a short circuit exists in the network at the distance shown 6 Disconnect the Meter and refitthe terminators to the network 19 Choice of the measurement units This Meter can display cable lengths in For coaxial twisted pair and shielded cable types an accuracy of 2 of either English system ft in or Metric system m cm To change the reading can be expected or 20 in 0 5 m for a cable less than 30 ft 10 m measurement scale system pre
17. ncluded in library ete 12 4 4 How to determine unknown V O P Settings ss ssssssssssiees sssssnieesesssnsaneees 14 4 4 1 Expanding cable library for custom cable types using nonvolatile memory seese 15 4 5 How to measure Cable length essesscsessssscesessssssns sratseeressnseeressaneenressasees 19 4 6 How to check networks Thin Ethernet svssssssssssssscessssssssssseeeeseeseneensessanses 19 5 Changing the measurement scale between English and Metric eese 20 6 Measurement ACCULACY veneers eeeeeeceeeeeeteetetteersneneeceeceeeeesecenttenseneeeseerenneesenenneaes 21 7 Theoretical and actual V O P serseeseesrssresrsureuruurunrunrnnnnuseurunrunrunnnusnurunrunrnnrnnenrene 22 8 Special features vssssssssseesssssssseeeessesessersssssssseseeesaeeessensssssssseeeeiaesensen sansa 23 8 1 Low battery indication 8 2 Overrange indication 8 3 Enable or disable the auto power off mode 2 eeeeeeeeetereertetes 24 8 4 Tone Generator mode c ccecceceececeesceetee eee eeeeeeceee ceetaeeeeeeeeeeseeneeseeeeeneeeetanenes 25 8 5 Line Voltage Detection mode ersereeeesrrsrseresreuseurunrunru runrnureurunrunrunrennenrenrunrunt 25 9 Maintenance 10 Specifications RTE AE TENEAT E TOTEE I AE EEEE TOTEAA 27 Repair and Warranty 1 Safety Information Safety Warnings This Meter complies with the safety requirements of IEC 1010 1 2001 It is designed for use on de energized circuits only however this Meter is
18. rn it off Press this button momentarily to always return to the initial display when the meter is in either SELECT mode or Memory mode And also press the button momentarily to exit the Tone Generator mode 6 MEMORY BUTTON or TONE BUTTON Press this button momentarily to activate the memory mode The display shows three menu selections STORE RECALL and CLEAR Press this button for more than 1 second to activate the Tone Generator mode Press the EXIT button to exit the Tone Generator mode 7 TEST BUTTON lt Press this button momentarily to measure length distance to an open or a short or V O P of cable under test 7 4 Meter Operation 4 1 Principles of operation The Meter works by measuring the time taken for a signal to travel to the far end of the cable or to an intermediate fault and to return The velocity at which the signal is transmitted Velocity of Propagation that is V O P will depend upon the characteristics of the cable to be tested The length is computed from the following formula travel time X 9 84 X 10 X V O P English measurement travel time X 3 X 10 X V O P Metric measurement The V O P is specified for standard cable types in this manual However do not rely solely on the specified V O P because variations of up to 20 can occur between batches of cable Therefore if accuracy is critical to your situation you must determine the actual V O P of each cable Verify the len
19. ss the UNIT button after the previous length measurement is carried out Then the Meter will display in the lower The V O P is less well defind with unshielded multicore cable including mains display as the following example for English to Metric measurement conversion cable and is lower when the cable is tightly wound on a spool than when it is installed This is due to capacitance and inductance effects between the turns Therefore the accuracy for these cables can be alittle bit deteriorated The BNC to Alligator Clip adaptor has an effective length of 8 inches 20 cm Fig 15 O 5 ae Press the TEST button to read the cable length in Metric scale x Please note that this feature enables the Meter compatible with both English scale system and Metric scale system very conveniently without returning the Meter to factory 20 21 Theoretically V O P can be calculated from the dielectric constant but actual values often differ slightly from the theoretical one In an actual cable the dielectric may not fill up the space between the conductors completely This can cause the effect of increasing V O P In twisted pair cables the V O P depends upon the pitch of the twist to some extent The tighter the pitch the more dielectric and the less air space so the V O P is higher For example variation of V O P between pairs with CAT 5 is typically 2 because the different pairs of CAT 5 are deliberately given staggered pitc
20. stance measurement The Meter incorporates an oscillating tone generator thatis detectable with a standard tone probe not supplied available in the marketplaces for use in the tracing and identification of pairs within a cable The Meter displays HEH message and stops operation ifline voltage of the cable under test exceeds 6 5 V when the Meter is turned on The BNC terminal is protected up to 250 V RMS in order to prevent it from being demaged by its misconnection to live circuits of networking You can store up to 20 cable test results for custom cable types in internal nonvolatile memory and the stored cable library provides quick and easy access to 39 standard cable types which enables accurate measurement without the necessity of entering V O P Velocity of Propagation The on site measurement scale changing feature enables the Meter to be globally used for both Metric measurement and English measurement without changing the measurement scale at factory The Meter comes with an Alligator Clip adaptor a user s manual and a soft carrying case Although this manual describes the operation of the Meter for both Metric measurement and English measurement all illustrations and examples assume use of the Meter for English measurement Cable Length Meter 1 DISPLAY Extra large backlit ICON type 7 segment LCD When the Meter is turned on all display segments and symbols appear briefly during 1 5 seconds for a self
21. test and then the Meter defaults the following initial display Initial Display When shipped out of factory The Meter defaults V O P of 66 0 and English scale When turned on after having been used in the field The Meter defaults the V O P e g 68 0 having been used just before it was turned off 2 BNC A shielded connector for either coaxial cable or Alligator Clip adaptor a standard accessory 3 MENU on screen SELECTION BUTTONS Each setting of the Meter to a measurement function may activate one or more menu selection button settings on the LCD Press the corresponding menu selection button to select the desired measurement Setup Mode Use the menu selection buttons in order to edit desired setup values as follows Press to move to next Press to step Press to Press to Setup Function to next digit in increase decrease Press to save all settings setting value setting value setting value and exit Setup Mode when setting is ended 4 POWER ON OFF BUTTON Press the POWER button for more than 1 second to turn the Meter on Auto Power Off This Meter is completely turned off after 30 minutes of no activities Press the POWER button to turn the Meter on again This feature can be disabled refer to Section 8 5 BACKLIGHT ON OFF BUTTON or EXIT BUTTON Press this button for more than 1 second to turn the backlight on and press this button again for more than 1 second to tu
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