HT instruments М75 - Manual (Page 17)

M72 - M73 - M74 - M75
EN - 15
4.9.  : RESISTANCE MEASUREMENT AND CONTINUITY TEST
CAUTION
Before taking resistance measurements make sure that the circuit under test is
not powered and that eventual condensers are discharged.
Fig. 5: Connection of the instrument’s terminals
1. Turn on the instrument
2. Press the arrow keys to select 
3. If the measuring cables being used have not been calibrated, first calibrate them as
described in § 4.9.1
4. Insert the black and green cables in the
corresponding input terminals of the
instrument
Resistance value
5. Position the test probes on the desired
points of the circuit under test (see Fig. 5)
6. Example of display of resistance value. If
such value is lower than 40  the
instrument emits an acoustic signal
7. To block the detected value on the display press FUNC/HOLD for less than 1 second
(see § 4.6.1)
8. To detect maximum, minimum and average values press FUNC/HOLD for more than 1
second (see § 4.6.2)
9. The measured value is out of accuracy if an input voltage is present
4.9.1. "CAL" mode
1. Any addition or replacement of cables, extensions and croco clips nullify the previous
calibration and make necessary a new calibration before performing further
measurements. Therefore the instrument must be calibrated in the same conditions at
which it will operate during measurements
2. Short-circuit the cable ends with each other as shown in Fig. 6 making sure that the
metallic parts of test probes and crocodiles are in good touch