Sealey TM103 User Manual download pdf (Page 6)

4.9. RESISTANCE MEASUREMENTS

 WARNING! To avoid electric shock, disconnect power to the unit under test and discharge all

capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords.

4.9.1. Set the function switch to the Ω position.

4.9.2. Insert the black test lead banana plug into the negative (COM) jack. Insert the red test lead banana plug into the positive Ω

jack.

4.9.3. Touch the test probe tips across the circuit or component under test. It is best to disconnect one side of the component

under test so the rest of the circuit will not interfere with the resistance

reading.

4.9.4. Read the resistance in the display The display will indicate the proper decimal point and value.

4.10. CONTINUITY CHECK

 WARNING! To avoid electric shock, never measure continuity on circuits or wires that have voltage on them.

4.10.1. Set the function switch to the / •))) position.

4.10.2. Insert the black lead banana plug into the negative (COM) jack. Insert the red test lead banana plug into the positive (Ω)

jack.

4.10.3. Press the Mode button until the •))) symbol appears in the display.

4.10.4. Touch the test probe tips to the circuit or wire you wish to check.

4.10.5. Touch the test probe tips to the circuit or wire you wish to check.

4.10.6. If the resistance is less than approximately 30Ω, the audible signal will sound and the display will show the reading.

If the circuit is open, the display will indicate “OL”.

4.11. DIODE TEST

 WARNING! To avoid electric shock, do not test any diode that has voltage on it.

4.11.1. Set the function switch to position.

4.11.2. Press the Mode button until the symbol appears in the display.

4.11.3. Insert the black test lead banana plug into the negative (-) jack (COM) and the red test lead banana plug into the positive

(+) jack (Ω).

4.11.4. Touch the test probe tips to the diode or semiconductor junction you wish to test. Note the meter reading.

4.11.5. Reverse the probe polarity by switching probe position. Note this reading.

4.7. DC CURRENT MEASUREMENTS

CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds.

Exceeding 30 seconds may cause damage to the meter and/or the test leads.

4.7.1. Insert the black test lead banana plug into the negative (COM) jack.

4.7.2. For current measurements up to 4000µA DC, set the function switch to the µA range and insert the red test lead banana

plug into the (µA) jack.

4.7.3. For current measurements up to 400mA DC, set the function switch to the mA range and insert the red test lead banana

plug into the (mA) jack.

4.7.4. For current measurements up to 10A DC, set the function switch to the 10A range and insert the red test lead banana plug

into the (10A) jack.

4.7.5. Press the Mode button until DC shows in the display.

4.7.6. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.

4.7.7. Connect test leads in series with the circuit under measurement.

4.7.8. Apply power to the circuit.

4.7.9. Read the current in the display. For mA DC measurements, reset the function switch to successively lower mA DC positions

to obtain a higher resolution reading. The display will indicate the proper decimal point and value.

4.8. AC CURRENT MEASUREMENTS

 WARNING! To avoid electric shock, do not measure AC current on any circuit whose voltage exceeds 250V AC.

CAUTION: Do not make current measurements on the 10A scale for longer than 30 seconds. Exceeding 30 seconds may

cause damage to the meter and/or the test leads

4.8.1. Insert the black test lead banana plug into the negative (COM) jack.

4.8.2. For current measurements up to 4000µA AC, set the function switch to the µA range and insert the red test lead banana

plug into the (µA) jack.

4.8.3. For current measurements up to 400mA AC, set the function switch to the mA range and insert the red test lead banana

plug into the (mA) jack.

4.8.4. For current measurements up to 10A AC, set the function switch to the 10A range and insert the red test lead banana

plug into the (10A) jack.

4.8.5. Press the Mode button until AC shows in the display.

4.8.6. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.

4.8.7. Connect test leads in series with the circuit under measurement.

4.8.8. Apply power to the circuit.

4.8.9. Read the current in the display. For mA DC measurements, reset the function switch to successively lower mA DC positions

to obtain a higher resolution reading. The display will indicate the proper decimal point and value.

TM103 Issue No: 2(I) - 18/06/14

Original Language Version

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Sealey TM103 User Manual Page 6

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