User Manual CDM250 Digital Multimeter 070-6736-03
Contents
1. 6 FUNCTION buttons Push in only one button to select VOLTS voltage A current or Q resistance Only one function will work at a time 7 AC DC button Push in to measure alternating current or AC voltage reset to the out position for direct current or DC voltage The AC DC button may be in either position when the meter is used for checking resistance 8 COM jack Input connector for common black test lead Used for AC or DC volts ohms and current functions This connector is not connected to the power source ground through the instrument 9 2 A jack Input connector for positive red test lead when instrument is used to measure current values up to 2 A CDM250 User Manual 5 Getting Started 6 CDM250 User Manual Reference This section of the manual explains how to take the following measurements m AC or DC voltage m AC or DC current m Resistance It also explains how use the CDM250 Digital Multimeter to check diodes Preparations for Measurement 1 Be sure that the CDM250 Digital Multimeter is connected to a specified power source and that the LINE VOLTAGE SELEC TORs are set to the proper position Refer to Preparing the Digital Multimeter for Use on page 2 Check that the FUNCTION and RANGE buttons are in the correct position If the value to be measured is unknown start at the highest range Be sure the red test lead is in the proper input jack for the measurement to be2. 13 Table 8 Alternating Current Measurement Specifications 15 Table 9 Resistance Measurement Specifications 16 Table 10 Standard Accessories 21 Table 11 Optional Accessories 21 Table 12 Accessory Power Cords 22 ii CDM250 User Manual C General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it Injury Precautions To avoid potential hazards use the product only as specified Use Proper Power Cord To avoid fire hazard use only the power cord specified for this product Avoid Electric Overload To avoid electric shock or fire hazard do not apply a voltage to a terminal that is outside the range specified for that terminal Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Do Not Operate Without Covers To avoid electric shock or fire hazard do not operate this product with covers or panels removed Use Proper Fuse To avoid fire hazard use only the fuse type and rating specified for this product CDM250 User Manual iii General Safety Summary Do Not Operate in Wet Damp Conditions
3. Range Resolution Accuracy Error Impedance 200 pA 0 1 pA 1 0 of rdg 300 mV 1KQ 2 mA 1 pA 1 digit maximum 1000 20 mA 10 A 100 200 mA 100 uA 10 AA 1 mA 1 0 ofrdg 11V 010 10 A 10 mA 3 digits maximum 010 Response Time Overload Protection CDM250 User Manual 35 2 A range 2 A 250 V fast blow fuse 10 A range None Appendix A Specifications Table 8 Alternating Current Measurement Specifications Manual Ranging Range Accuracy 200 pA 1 5 of rdg am Ina Response Time 8s Overload Protection 10 A range None Loading Error 300 mV RMS maximum 1 1 V RMS maximum 2 A range 2 A 250 V fast blow fuse 14 CDM250 User Manual Appendix A Specifications Table 9 Resistance Measurement Specifications Manual Ranging Max Open Maximum Circuit Range Resolution Accuracy Test Current Voltage 200 Q 01Q 0 75 ofrdg 3 2 V 4 digits 2 KQ 1Q 0 75 of rdg 6V 20 kA 10 Q Fidel 200 KQ 100 Q 2000 KQ 1kQ 20 MQ 10 kQ 1 5 of rdg 50 nA 5 digits Response Time 200 Q to 2000 KQ ranges 55 20 MQ range 15s Overload Protection 500 VDC or AC CDM250 User Manual Appendix A Specifications Table 10 Certifications and compliances EC Declaration of Conformity Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official J ournal of the European
4. Communities EN 55011 Class B Radiated and Conducted Emissions EN 50081 1 Emissions EN 60555 2 AC Power Line Harmonic Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 RF Electromagnetic Field Immunity IEC 801 4 Electrical Fast Transient Burst Immunity IEC 801 5 Power Line Surge Immunity 1 The following degree of performance degradation is deemed acceptable by the manufacturer Ambient RF fields of 3 V m intensity may induce error up to 5 of reading 16 CDM250 User Manual EE Appendix B Maintenance This appendix provides information for the basic maintenance of the CDM250 Digital Multimeter Cleaning To clean the digital multimeter use a soft cloth dampened in a solution of mild detergent and water Do not spray cleaner directly onto the instrument since it may leak into the cabinet and cause damage Do not use chemicals containing benzine benzene toluene xylene acetone or similar solvents Do not use abrasive cleaners on any portion of the digital multimeter Preparing for Shipment If the original packaging is unfit for use or not available use the following packaging guidelines 1 Use a corrugated cardboard shipping carton having inside dimensions at least three inches greater than the instrument dimensions 2 Put the instrument into a plastic bag or wrap to protect it from dampness and loose packing material 3 Place the instrument into the box and firmly
5. Panel u Dre 4 Reference 55 22 senc tante 7 Preparations for Measurement 7 Measuring AC or DC Voltage 7 Measuring AC or DC Current 8 Measuring Resistance 9 Checking Diodes 10 Appendix A Specifications 11 Appendix B Maintenance 17 Cleaning es ee NE ea 17 Preparing for Shipment 17 Troubleshooting 18 No Display with Power On 18 CDM250 Does Not Read Current 2A 18 Display On but CDM250 Not Displaying Reading 18 Display On but CDM250 Does Not Read Current 10A 19 Appendix C Replaceable Parts 21 Standard Accessories 21 Optional Accessories 21 CDM250 User Manual i Table of Contents List of Tables Table 1 General Characteristics 11 Table 2 Physical Characteristics 11 Table 3 Environmental Characteristics 11 Table 4 Electrical Characteristics 12 Table 5 DC Volts Measurement Specifications 12 Table 6 AC Volts Measurement Specifications 13 Table 7 Direct Current Measurement Specifications
6. Use only power cords that are equipped with a third conductor that provide a safety ground connection Use only the power cords specified for this equipment Refer to Appendix C Replaceable Parts on page 21 for power cord part numbers CDM250 User Manual 3 Getting Started Front Panel Figure 2 shows the front panel controls connectors and indicators with brief descriptions of the items following the figure TektroNix CDM250 MULTI ETER POWER ON OFF 500 A 200 2m 20m zoom 2000m 104 AC DC a 200 2K 20K 2000K Figure 2 Front Panel 1 POWER button Powers the CDM250 on or off Power ON is indicated by the LED display 2 10 A UNFUSED jack Input connector for positive red test lead when instrument is used to measure high current over 2 A but less than 10 A 3 V Q Input connector for positive red test lead Used for AC volts DC volts and ohms Q functions 4 LED Display Shows voltage current or resistance value Display shows the number at the extreme left in an overrange condition Negative voltages or currents are indicated automati cally with a minus sign at the extreme left of the display 5 RANGE buttons Push to select the highest value of the voltage current or resistance to be measured 4 CDM250 User Manual Getting Started
7. stabilize it with packing material 4 Seal the carton with shipping tape CDM250 User Manual 17 Appendix B Maintenance Troubleshooting 18 Electronic maintenance on the CDM250 must be performed by a trained technician However any operator can perform some basic and routine maintenance The CDM250 will give some indications of problems to aid the operator No Display with Power On If the LED Display is not lighted but the POWER button is pushed in and the CDM250 Digital Multimeter power cord is plugged into an outlet do the following steps WARNING To prevent electrical shock unplug the power cord and disconnect the test leads from any voltage source before checking or replacing the fuses 1 Check the line fuse If the fuse is open replace it 2 If the line fuse is good check the power outlet for proper voltage If the outlet voltage is incorrect call service personnel 3 If outlet voltage is correct check power cord continuity If the power cord fails the continuity check replace the power cord CDM250 Does Not Read Current 2A Check the function fuse If the fuse is open replace it Display On but CDM250 Not Displaying Reading 1 Check that the function and range button selections are correct 2 If function and range buttons are correct check that the test leads are connected properly 3 If the test leads are connected properly check the test leads for continuity If a test lead fa
8. 4 07 230 V Australia 161 0104 05 Ta 230 V North America 161 0104 08 230 V Switzerland 161 0167 00 230 V CDM250 User Manual 22
9. To avoid electric shock do not operate this product in wet or damp conditions Do Not Operate in Explosive Atmosphere To avoid injury or fire hazard do not operate this product in an explosive atmosphere Product Damage Precautions Use Proper Voltage Setting Before applying power ensure that the line selector is in the proper position for the power source being used Provide Proper Ventilation To prevent product overheating provide proper ventilation Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Safety Terms and Symbols A Terms in This Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CDM250 User Manual General Safety Summary f CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property 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 4 A m DANGER Protective Ground ATTENTION Double High Voltage Earth Ter
10. User Manual Tektronix 7 CDM250 Digital Multimeter 070 6736 03 Copyright Tektronix Inc 1987 All 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 Tektronix Inc P O Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such 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 the 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 an
11. d 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 or c 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 WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL 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 a Table of Contents General Safety Summary iii Getting Started u seen 1 Preparing the Digital Multimeter for Use 2 Front
12. en the current value is unknown start at the highest range 8 CDM250 User Manual Reference NOTE Current readings are taken in series with the component or device being measured 6 Push the POWER button to the ON position 7 Connect the test leads and read the display value NOTE Remove the red test lead from the circuit or component being tested before changing ranges Measuring Resistance 1 Connect the black test lead to the black COM jack 2 Connect the red test lead to the red V jack 3 Push the Q ohms function button 4 Determine the highest anticipated resistance on the range scale and press the corresponding range button N CAUTION To prevent damage to the equipment turn off all power to the circuit or component being measured 5 Push the POWER button to the ON position 6 Connect the test leads and read the display value NOTE When the component being tested is in a circuit where parallel current paths offer low resistance the above test may require disconnecting one end of the component from the circuit CDM250 User Manual 9 Reference Checking Diodes 1 Connect the black test lead to the black COM jack 2 Connect the red test lead to the red V Q jack 3 4 Push in the Q ohms function button Simultaneously push the 200 and the 2K range buttons to the in position CAUTION To prevent damage to the equipment turn off all power t
13. ils the continuity check replace the test lead CDM250 User Manual Appendix B Maintenance Display On but CDM250 Does Not Read Current 10A 1 Check that the function and range button selections are correct 2 If function and range buttons are correct contact the nearest Tektronix service center CDM250 User Manual 19 Appendix B Maintenance 20 CDM250 User Manual ER EE Appendix C Replaceable Parts Replaceable parts may be ordered directly from your authorized Tektronix dealer Standard Accessories The following items are shipped with the CDM250 Digital Multimeter Table 11 Standard Accessories Accessory Tektronix Part Number Fuse 3AG 0 125A 250V Slow Blow 159 0313 XX 90 132 V operation Fuse 3AG 2A 250V Fast Blow 159 0021 XX CDM250 User Manual 070 6736 XX 115V power cord Refer to Table 13 Test Lead Set 196 3200 XX Optional Accessories The following items are available as optional accessories Table 12 Optional Accessories Accessory Fuse 3AG 0 062A 250V Slow Blow 198 250 V operation 230V Power Cords CDM250 User Manual Tektronix Part Number 159 0051 XX Refer to Table 13 21 Appendix C Replaceable Parts The following power cords are available Table 13 Accessory Power Cords Tektronix Part Plug Configuration Normal Usage Number North America 161 0104 00 115 V Europe 161 0104 06 230 V United Kingdom 161 010
14. made Measuring AC or DC Voltage 1 2 3 Connect the black test lead to the black COM jack Connect the red test lead to the red V Q jack For DC voltage set the AC DC function button to the out position For AC voltage set the AC DC function switch to the in position Push the VOLTS function button in to lock it CDM250 User Manual 7 Reference 5 Determine the highest anticipated voltage and push in the corresponding range button When the voltage is unknown select the highest range 6 Push the POWER button to the ON position NOTE Voltage readings are taken in parallel with the component or device being measured 7 Connect the test leads and read the displayed value NOTE Remove the red test lead from the circuit or component being tested before changing ranges Measuring AC or DC Current 1 Connect the black test lead to the black COM jack 2 For current up to 2 A connect the red test lead to the white 2A jack For current between 2 A and 10 A connect the red test lead to the white 10A UNFUSED jack A CAUTION The 10 A UNFUSED jack is not protected Excess current may damage the instrument 3 To measure alternating current AC set the AC DC button to the in position To measure direct current DC set the AC DC button to the out position 4 Push the A amperes button in 5 Determine the highest anticipated current and push in the corresponding range button Wh
15. mage to the instrument set the line voltage selectors to the proper voltage setting and install the correct line voltage fuse before operating the equipment 1 Set the line voltage selectors to the input line voltage These selectors connect internal wiring for various line voltages This product is intended to operate from a power source that does not supply more than 250 Vrms between the supply conductors or between either supply conductor and ground For line voltage ranges refer to Appendix A Specifications on page 11 disconnect the test leads from any voltage source before checking or N WARNING To prevent electrical shock unplug the power cord and replacing the fuses 2 Check that the correct line fuse is installed The line fuse provides protection if the equipment malfunctions or an overload occurs Refer to Appendix C Replaceable Parts on page 21 for fuse part numbers 2 CDM250 User Manual Getting Started 3 Check that the correct function fuse is installed The function fuse provides protection when using the the 2 A input jacks Refer to Appendix C Replaceable Parts on page 21 for fuse part number properly grounded power source The outside ground of this connector is connected through the equipment to the power source ground Do not remove the ground lug from the power cord for any reason N WARNING To prevent electrical shock connect the power cord to a 4 Connect the input power cord
16. minal Refer to Insulated Manual Certifications and Compliances CSA Certified Power Cords CSA Certification includes the products and power cords appropriate for use in the North America power network All other power cords supplied are approved for the country of use CDM250 User Manual v General Safety Summary vi CDM250 User Manual RE Getting Started The Tektronix CDM250 Digital Multimeter measures analog quantities and displays them in digital form The CDM250 takes the following measurements m Direct and alternating current from 0 A to 10 A in six ranges m AC and DC voltage from 200 mV to 500 V in five ranges m Resistance from 0 Q to 20 MQ in six ranges All values are displayed on a 31 digit light emitting diode LED indicator Alternating voltages and currents are displayed in RMS values The Tektronix CDM250 has a locking multiposition handle that folds under the instrument to allow stacking with other instruments of the same series The CDM250 is delivered with a set of test leads a 115 V power cord an installed line fuse for 115 V operation and this manual CDM250 User Manual 1 Getting Started Preparing the Digital Multimeter for Use Check the following items prior to operating the CDM250 Digital Multimeter for the first time see Figure 1 for locations of items Figure 1 Line Voltage Selectors Power Input and Fuse Locations CAUTION To prevent da
17. o the circuit or component being measured Connect the red test lead to the anode and the black test lead to the cathode of the diode Push the POWER button to the ON position A reading of about 25 0 to 90 0 should appear on the display Multiply the result by 10 to arrive at the forward voltage drop in millivolts If the reading on the display is 1 overrange indicator the diode may be defective open If the reading is 00 0 the diode is defective shorted Connect the black test lead to the anode and the red test lead to the cathode of the diode A reading of 1 overrange indicator should appear on the display If any other value is displayed the diode is defective On some diodes the meter might flash a high number for a very short period of time but the reading should go to the overrange indicator NOTE When the diode being tested is in a circuit where parallel current paths offer low resistance the above tests may require disconnecting one end of the component from the circuit 10 CDM250 User Manual i Appendix A Specifications Table 1 General Characteristics Display 31 digit LED displays to 1999 counts positive polarity assumed minus sign for negative polarity and the number 1 at the extreme left as the over range indicator Measurements AC and DC voltages AC and DC currents and resistance Maximum Common Mode 500 V DC AC peak Voltage Zero Adjustment Automatic Sampling Ra
18. te 2 5 measurements per second nominal Table 2 Physical Characteristics Width 240 mm 9 4 in Height 64 mm 2 5 in Depth 230 mm 9 0 in Weight 1 8 kg 4 0 Ib Table 3 Environmental Characteristics Storage Temperature 10 C to 60 C 80 RH Operating Temp 10 C to 40 C 0 to 75 RH CDM250 User Manual 11 Appendix A Specifications Table 4 Electrical Characteristics 90 to 110 108 to 132 198 to 242 and 216 to 250 VAC at 50 60 Hz 10 VA 6 W maximum Maximum of 500 V from earth ground Line Voltage Range Power Consumption Ground Isolation NOTE Accuracy is specified for a temperature range of 18 C to 28 C 75 RH Table 5 DC Volts Measurement Specifications Range Accuracy Input Impedance 200 mV 0 5 of rdg 10 MQ 1 digit m Response Time 35 Overload Protection 200 mV range 500 VDC 350 VAC 2 V to 500 V ranges 500 VDC 500 VAC 12 CDM250 User Manual Appendix A Specifications Table 6 AC Volts Measurement Specifications Manual Ranging Average responding calibrated to read RMS value of sine wave Resolution Accuracy Input Impedance 1 0 ofrdg 10 MQ lt 100 pF 4 digits 45 500 Hz 200 V 500 V 1V Response Time 8s Overload Protection 200 mV range 500 VDC 350 VAC 2 V to 500 V ranges 500 VDC 500 VAC Table 7 Direct Current Measurement Specifications Manual Ranging Loading Input
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