Jensen JTM-105A, User Manual

Page 1: ...User s Guide True RMS Industrial Multimeter Model JTM 105A ...

Page 2: ...mbol indicates a potentially hazardous situation which if not avoided could result in death or serious injury CAUTION This CAUTION symbol indicates a potentially hazardous situation which if not avoided may result damage to the product MAX 1000V This symbol advises the user that the terminal s so marked must not be connected to a circuit point at which the voltage with respect to earth ground exce...

Page 3: ...s energy consuming equipment to be supplied from the fixed installation Note Examples include household office and laboratory appliances OVERVOLTAGE CATEGORY III Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations Note Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation OVERVOLTAGE CATEG...

Page 4: ...CAUTION when working with high voltages 3 DO NOT measure voltage if the voltage on the COM input jack exceeds 600V above earth ground 4 NEVER connect the meter leads across a voltage source while the function switch is in the current resistance or diode mode Doing so can damage the meter 5 ALWAYS discharge filter capacitors in power supplies and disconnect the power when making resistance or diode...

Page 5: ...3 Hz and button 4 Mode button 5 Function switch 6 mA µA and 10A input jacks 7 COM input jack 8 Positive input jack 9 HOLD and Backlight button 10 RELATIVE button 11 MAX MIN button Note Tilt stand and battery compartment are on rear of unit JTM 105a V3 0 10 07 5 ...

Page 6: ...cap m milli 10 3 volts amps A Amps k kilo 10 3 ohms F Farads capacitance M mega 10 6 ohms Ω Ohms Hz Hertz frequency V Volts Percent duty ratio REL Relative AC Alternating current AUTO Autoranging DC Direct current HOLD Display hold ºF Degrees Fahrenheit ºC Degrees Centigrade MAX Maximum MIN Minimum JTM 105a V3 0 10 07 6 ...

Page 7: ... range DC VOLTAGE MEASUREMENTS CAUTION Do not measure DC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the green VDC position 2 Insert the black test lead banana plug into the negative COM jack Insert the red test lead banana plug into the positive V jack 3 Touch the black test probe tip to the n...

Page 8: ...t measure AC voltages if a motor on the circuit is being switched ON or OFF Large voltage surges may occur that can damage the meter 1 Set the function switch to the green VAC Hz position 2 Insert the black test lead banana plug into the negative COM jack Insert red test lead banana plug into the positive V jack 3 Touch the black test probe tip to the neutral side of the circuit Touch the red test...

Page 9: ...function switch to the yellow mA position and insert the red test lead banana plug into the µA mA jack 4 For current measurements up to 20A DC set the function switch to the yellow 10A HZ position and insert the red test lead banana plug into the 10A jack 5 Press the MODE button to indicate DC on the display 6 Remove power from the circuit under test then open up the circuit at the point where you...

Page 10: ...µA mA jack 4 For current measurements up to 20A AC set the function switch to the yellow 10A HZ position and insert the red test lead banana plug into the 10A jack 5 Press the MODE button to indicate AC on the display 6 Remove power from the circuit under test then open up the circuit at the point where you wish to measure current 7 Touch the black test probe tip to the neutral side of the circuit...

Page 11: ...e side of the part under test so the rest of the circuit will not interfere with the resistance reading 5 Read the resistance in the display CONTINUITY CHECK WARNING To avoid electric shock never measure continuity on circuits or wires that have voltage on them 1 Set the function switch to the green Ω CAP position 2 Insert the black lead banana plug into the negative COM jack Insert the red test l...

Page 12: ...indicate OL in both polarities TEMPERATURE MEASUREMENTS 1 Set the function switch to the green Temp position 2 Insert the Temperature Probe into the input jacks making sure to observe the correct polarity 3 Press the MODE button to indicate ºF or ºC 4 Touch the Temperature Probe head to the part whose temperature you wish to measure Keep the probe touching the part under test until the reading sta...

Page 13: ...o the capacitor to be tested 5 The test may take up to 3 minutes or more for large capacitors to charge Wait until the readings settle before ending the test 6 Read the capacitance value in the display FREQUENCY DUTY CYCLE MEASUREMENTS ELECTRONIC 1 Set the rotary function switch to the green Hz position 2 Press the Hz button to indicate Hz in the display 3 Insert the black lead banana plug into th...

Page 14: ...ey for 2 seconds Note Manual ranging does not apply for the Capacitance and Frequency functions MAX MIN Note When using the MAX MIN function in Autoranging mode the meter will lock into the range that is displayed on the LCD when MAX MIN is activated If a MAX Min reading exceeds that range an OL will be displayed Select the desired range BEFORE entering MAX MIN mode 1 Press the MAX MIN key to acti...

Page 15: ...sured value 4 Press the REL button to exit the relative mode Note The Relative function does not operate in the Frequency function DISPLAY BACKLIGHT Press the HOLD key for 1 second to turn on or off the display backlight function The backlight will automatically turn off after 10 seconds HOLD The hold function freezes the reading in the display Press the HOLD key momentarily to activate or to exit...

Page 16: ...RY If it gets wet wipe it off 2 USE AND STORE THE METER IN NORMAL TEMPERATURES Temperature extremes can shorten the life of the electronic parts and distort or melt plastic parts 3 HANDLE THE METER GENTLY AND CAREFULLY Dropping it can damage the electronic parts or the case 4 KEEP THE METER CLEAN Wipe the case occasionally with a damp cloth DO NOT use chemicals cleaning solvents or detergents 5 US...

Page 17: ...g a Phillips head screwdriver 3 Insert the battery into battery holder observing the correct polarity 4 Put the battery cover back in place Secure with the screws WARNING To avoid electric shock do not operate the meter until the battery cover is in place and fastened securely NOTE If your meter does not work properly check the fuses and batteries to make sure that they are still good and that the...

Page 18: ...screws and the battery 4 Remove the six A screws securing the rear cover 5 Gently remove the old fuse and install the new fuse into the holder 6 Always use a fuse of the proper size and value 0 8A 1000V fast blow for the 600mA range SIBA 70 172 40 10A 1000V fast blow for the 20A range SIBA 50 199 06 7 Replace and secure the rear cover battery and battery cover WARNING To avoid electric shock do no...

Page 19: ...ranges are specified from 5 of range to 100 of range 600μA 0 1μA 6000μA 1μA 60mA 0 01mA 600mA 0 1mA 6A 0 001A 10A 0 01A 1 0 reading 3 digits DC Current 20A 30 sec max with reduced accuracy 40Hz to 1kHz 600μA 0 1μA 6000μA 1μA 60mA 0 01mA 600mA 0 1mA 6A 0 001A 10A 0 01A 1 5 reading 3 digits AC Current 20A 30 sec max with reduced accuracy All AC voltage ranges are specified from 5 of range to 100 of ...

Page 20: ...1Hz 99 99Hz 0 01Hz 999 9Hz 0 1Hz 9 999kHz 0 001kHz 99 99kHz 0 01kHz 999 9kHz 0 1kHz 9 999MHz 0 001MHz 40MHz 01MHz 0 1 reading 1 digits Frequency electronic Sensitivity 0 8V rms min 20 to 80 duty cycle and 100kHz 5Vrms min 20 to 80 duty cycle and 100kHz 10 00 400Hz 0 01Hz 0 5 reading Frequency electrical Sensitivity 15Vrms 0 1 to 99 9 0 1 1 2 reading 2 digits Duty Cycle Pulse width 100µs 100ms Freq...

Page 21: ...ale up to 500V decreasing linearly to 1 5 at 1000V Display 6 000 count backlit liquid crystal with bargraph Overrange indication OL is displayed Auto Power Off 15 minutes approximately with disable feature Polarity Automatic no indication for positive Minus sign for negative Measurement Rate 2 times per second nominal Low Battery Indication is displayed if battery voltage drops below operating vol...

Page 22: ...2 x 2 0 187 x 81 x 50mm includes holster Safety This meter is intended for origin of installation use and protected against the users by double insulation per EN61010 1 and IEC61010 1 2 nd Edition 2001 to Category IV 600V and Category III 1000V Pollution Degree 2 Approvals CE ...

Page 23: ...tion improper maintenance or repair or unauthorized modification Jensen specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential damages Jensen s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whethe...