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Autoranging True RMS Multimeter

TM-87 / TM-88

User’s manual

HB2TM8700000

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Summary of Contents for TM-87

Page 1: ...Autoranging True RMS Multimeter TM 87 TM 88 User s manual HB2TM8700000 ...

Page 2: ...le Auto Power OFF 8 4 3 Measurements 9 4 3 1 DC Voltage measurement 9 4 3 2 AC Voltage measurement 10 4 3 3 DC Current measurement 11 4 3 4 AC Current measurement 12 4 3 5 Resistance measurement and Continuity Test 13 4 3 6 Diode test 14 4 3 7 Capacitance measurement 15 4 3 8 Frequency measurement 16 4 3 9 Temperature test Only for TM 88 17 5 MAINTENANCE 18 5 1 General information 18 5 2 Battery r...

Page 3: ...ent or its components Danger high voltage risk of electric shocks Double insulated meter AC voltage or current DC voltage or current 1 1 PRELIMINARY This instrument has been designed for use in environments of pollution degree 2 It can be used for VOLTAGE and CURRENT measurements on installations of overvoltage CAT III 1000V and CAT IV 600V This instrument is not suitable for measurements of non s...

Page 4: ...SSIS circuits are divided into the following measurement categories Measurement category IV is for measurements performed at the source of the low voltage installation Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units Measurement category III is for measurements performed in the building installation Examples are measurements on dis...

Page 5: ...ent Mean value instruments provide only the value of the fundamental wave while TRMS instruments provide the value of the entire wave including harmonics within the passband of the instrument Accordingly if the same quantity is measured with both kinds of instruments the measured values are identical only if the wave is purely sinusoidal Should it be distorted TRMS instruments provide higher value...

Page 6: ... you have to return back the instrument for any reason please follow the instructions mentioned in paragraph 7 3 2 SUPPLY VOLTAGE The instrument is supplied by 1x9V battery type NEDA1604 JIS006P IEC6F22 When battery is low a low battery indication is displayed To replace insert battery please refer to paragraph 5 2 3 3 CALIBRATION The instrument complies with the technical specifications contained...

Page 7: ... PK REL Key 4 MX MN Key 5 R SEL Key 6 Backlight Key 7 OFF position 8 DCV position 9 ACV position 10 Posizione Ω 11 position 12 position 13 Hz position 14 µADC position and position TM 88 15 µAAC position DCµA and ACµA position TM 88 16 DCA and ACA position 17 COM A and VΩ Hz µA Fig 1 Instrument description 6 ...

Page 8: ...d or rotate the selector on another position By pressing PK REL key the relative measurement is activated the meter saves the offset value on the display and the REL symbol is shown The following measurement will be referred to this offset value By pressing again PK REL key the offset value is shown and the REL symbol is blinking To exit this function keep pressed PK REL for at least one second or...

Page 9: ...or 4 2 6 Disable Auto Power OFF When the meter is to be used for long periods of time the operator might want to disable the AutoPowerOFF function Once the AutoPowerOFF function is disabled the meter stays on continuously To disable the AutoPowerOFF function Switch OFF the meter Turn ON the meter keeping pressed PK REL MX MIN and R SEL keys The AutoPowerOFF function is automatically activated when...

Page 10: ...voltage value under test is unknown select the highest range 3 Insert the test leads into the jacks the red plug into HzVΩµA jack and black plug into COM jack see Fig 2 4 Connect the red and black test leads to the positive and negative poles of the circuit under test respectively The voltage value is displayed 5 If the message O L is displayed select a higher range 6 The symbol on the instrument ...

Page 11: ...select the correct range or using the Autorange feature see paragraph 4 2 4 If the voltage value under test is unknown select the highest range 3 Insert the test leads into the jacks the red plug into HzVΩµA jack and black plug into COM jack see Fig 3 4 Connect the test leads to the circuit under test The voltage value is displayed 5 If the message O L is displayed select a higher range 6 For HOLD...

Page 12: ...ose current is to be measured respecting the polarities 5 Energize the circuit under test The current value will be displayed 6 The message O L means that the detected current exceeds the limits 7 If the measured value is lower than 4mA to get a better resolution Switch off the circuit under test Turn the selector on µA Remove the red test lead from A jack and insert it into HzVΩµA jack and power ...

Page 13: ...4 Connect the red and the black plugs in series with the circuit whose current is to be measured 5 Energize the circuit under test The current value will be displayed 6 The message O L means that the detected current exceeds the limits 7 If the measured value is lower than 4mA to get a better resolution Switch off the circuit under test Turn the selector on µA Remove the red test lead from A jack ...

Page 14: ...Connect the test leads to the circuit under test The resistance value is displayed 4 Pressing the R SEL key to select the correct range or using the Autorange feature see paragraph 4 2 4 If the resistance value under test is unknown select the highest range 5 If the message O L is displayed a higher range must be selected 6 The continuity test is always active and the test is performed using the t...

Page 15: ... leads to the diode under test observing the proper polarities see Fig 7 The threshold voltage value of direct polarization is shown at display The meter displays the diode voltage to approximately 0 4 0 9V for good junction 4 If the threshold voltage value is 0V the diode P N junction is shorted circuit 5 If the message O L is displayed the diode terminals are reversed or the diode P N junction i...

Page 16: ...d Due to internal delay time bargraph it s no operative in capacitance measurement Fig 8 Using the instrument for Capacitance measurement 1 Selecting the position 2 Insert the test leads into the jacks the red plug into HzVΩµA jack and black plug into COM jack see Fig 8 3 Connect the red and black test clamps to the capacitor terminals respecting if necessary the proper polarities The capacitance ...

Page 17: ...he red plug into HzVΩµA jack and black plug into COM jack see Fig 9 3 Connect the test leads to the circuit under test The frequency value will be displayed 4 Pressing the R SEL key to select the correct range or using the Autorange feature see paragraph 4 2 4 If the freqency value under test is unknown select the highest range 5 If the message O L is displayed the maximum readable value is reache...

Page 18: ...nstrument Fig 10 Using the instrument for Temperature test 1 Selecting the position 2 Pressing the R SEL key to select the and readings 3 Insert the banana plug adapter T10 with correct plug into VΩ HzµA jack and plug into COM jack with banana pins to K type socket to adapt other standard K type mini plug temperature probes 4 Connect the other ends of temperature test leads for temperature measure...

Page 19: ...its inner components 5 2 BATTERY REPLACEMENT When the low battery indication is shown the battery it s to be replaced CAUTION Only skilled technicians can open the instrument and replace batteries Before removing batteries disconnect the test leads from the input terminals to avoid electrical shocks LEGEND 1 Disconnect the test leads from the input terminals 2 Remove the fixing screws from the bac...

Page 20: ...er and remove it 3 Remove the defective fuse and install a new fuse of the same size and rating fast 10A 1000V Bussmann type Make sure the new fuse is centered in the fuse holder Re screw the back holster Fig 11 Fuse replacement 5 4 CLEANING To clean the instrument use a soft dry cloth Never use a wet cloth solvents or water 5 5 END OF LIFE Caution this symbol indicates that equipment and its acce...

Page 21: ...400 0V 0 1V 750V 1V 1 5 rdg 3dgt 50 500Hz 10MΩ 100pF 1000VDC 750VACrms DC Current Range Resolution Accuracy Output voltage Overload protection 400 0µA 0 1µA 4000µA 1µA 5mV µA 750Vrms 10 00A 0 01A 1 0 rdg 2dgt 2V max Fuse 10A 1000V AC TRMS Current Range Resolution Accuracy 50 500Hz Output voltage Overload protection 400 0µA 0 1µA 4000µA 1µA 1 2 rdg 5dgt 5mV µA 750Vrms 10 00A 0 01A 1 5 rdg 5dgt 50 3...

Page 22: ...0 0MHz 0 1MHz Not declared 2VACrms 5VACrms 600Vrms Minimum pulse duration 25ns 30 Duty Cycle 70 Capacitance Range Resolution Accuracy Overload protection 4 000nF 0 001nF 40 00nF 0 01nF Not declared 400 0nF 0 1nF 4 000µF 0 001µF 40 00µF 0 01µF 400 0µF 0 1µF 2 0 rdg 8dgt 4 000mF 0 001mF 40 00mF 0 01mF 5 0 rdg 20dgt 600Vrms Temperature Use T10 adapter and K type probe only TM 88 Range Resolution Accu...

Page 23: ...8 C NMRR Normal Mode Rejection Ratio 50dB for DC parameters and 50 60Hz CMRR Common Mode Rejection Ratio 100dB from DC up to 60Hz on DCV 60dB from DC up to 60Hz on ACV 6 1 2 Safety The instrument complies to EN 61010 1 Insulation Class 2 Double insulation Pollution degree 2 Overvoltage category CAT IV 600V CAT III 1000V V Ω µA Max height 2000m 22 ...

Page 24: ...9 counts symbol decimal point sign and bargraph Out of range indications OL or OL 6 2 ENVIRONMENT 6 2 1 Environmental conditions Reference temperature 23 5 C Working temperature 0 30 C Relative humidity 80 HR Storage temperature 20 60 C Storage humidity 80 HR 6 2 2 EMC and LVD This meter is designed and tested in compliance to the requirements of the European EMC Directive 89 336 EEC modified with...

Page 25: ... Repairs made necessary by previous attempts for repair carried out by unskilled or unauthorized personnel Instruments for whatever reason modified by the customer himself without explicit authorization of our Technical Dept The contents of this manual may not be reproduced in any form whatsoever without the manufacturer s authorization Our products are patented and our logotypes registered We res...

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Page 28: ...TENMARS ELECTRONICS CO LTD 6F 586 RUI GUANG ROAD NEIHU TAIPEI 114 TAIWAN E mail service tenmars com http www tenmars com ...

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