HT instruments HT701 - Manual (Page 19)

HT701
EN - 18
4.4.9. Insulation resistance measurement
CAUTION
 Check that no voltage is present at the ends of the circuit to be tested
before carrying out an insulation measurement.
 During the whole test, make sure that the applied voltage cannot be
accessed by third parties and adequately arrange the system by
disconnecting everything that must not be included in the test.
Fig. 10: Use of the instrument for Insulation measurement
1. Select the INSULATION position.
2. Press the RANGE key for manually selecting test voltage (see § 4.2.6).
3. If necessary, press the MODE key for selecting the “SMOOTH” mode (see § 4.3.5).
The message “SMOOTH” is shown on the display.
4. If necessary, press the HOLD/LOCK key for selecting the “LOCK” mode (see § 4.2.1).
The symbols “ ” and “LOCK” appear on the display.
5. Insert the red remote probe into input lead “
” and the black cable into input lead “ ”
(see Fig. 10).
6. Position the leads at the ends of the circuit to be tested, respecting positive and negative
polarity (see Fig. 10). If necessary, use the alligator clips.
7. Press and hold the TEST key (with “LOCK” function deactivated) on the instrument or
on the remote probe to start measuring. The symbols “TEST” and “ ”, further to the
indication of test voltage, are shown on the display. Release the TEST key to stop
measuring. The result, expressed in M
, is shown on the display
8. The message “> full scale M
” indicates that the measured value exceeds the full
scale relevant to the selected test voltage.
9. To save the result, see § 4.2.5