User Manual

FLIR IM75 USER MANUAL Document Identifier: IM75-en-US_AB

5.8 Earth Bond Resistance Measurements (ZERO Ω)

1. Move the function dial to the Earth-bond resistance position (ZERO Ω); the Earth-bond

resistance icon will appear.

2. Insert the black probe lead into the COM terminal and red probe lead into the

ZERO/Ohm/Insulation terminal.

3. Before testing, short the ends of the probes and press the MODE button. The ZERO icon will

appear on the display and the offset value will be stored. If the test leads are not shorted or if

there is residual resistance, the display will show the > 2.00 ohms (this indication could be due

to faulty leads, improper test lead insertion, or meter problem. Tests should not be attempted

until root cause of the high resistance is determined.

4. Connect the test leads to the Device under test.

5. Press TEST OK to run a test.

6. To lock the test ON, press the HOLD/LOCK button (the LOCK icon will appear) and then

press TEST OK to test continuously.

7. Press TEST OK again to stop the test.

8. Note that the Earth Bond Resistance Measurement mode can also be used to measure

standard resistance to 40kohms

NOTE: The 99-point Data Record memory function cannot be activated in the usual way while

using the Earth Bond Resistance function (since the TEST OK button is used for testing in this

case and not for saving readings). The last reading, however, is held on the display and can then

be saved as described in the Extended Functionality section below under Section 5.12.7 Data

Recording Mode.

5.9 Continuity Test

Warning: Do not do diode, resistance or continuity tests before removing the power from

capacitors and other devices under test during a measurement. Injury to persons can occur.

9. Set the function switch to the position.

10. Insert the black probe lead into the COM terminal and red probe lead into the V terminal.

11. Use the MODE button to select continuity measurement. The indicator will be displayed.

12. Insert the black probe lead into the COM (negative) terminal and the red probe lead into the

positive terminal.

13. Touch the tips of the probe across the circuit or component under test.

14. If the resistance is 30 ± 5 Ω (nominal) or less, the meter will beep.

Note: This threshold is user selectable in the SET UP menu under the Cntin (continuity) setting:

Range: 10-50 Ω; Increment: 1; Default: 30 Ω.