Amprobe AMB-35 Insulation-Tester - Manual (Page 6)

Please remove the voltage from the circuit under test before
proceeding with the next step. 2). Connect the red test lead to “VΩ” jack and black test lead to
“COM” jack.
9 10
5). Press and hold the TEST key until a stable reading is displayed
on the main display.
3). Connect the probes to the circuit to be measured, if there is a
voltage measured by the probes, the voltage will be displayed.
A repetitive beep and the flashing high voltage symbol “ ” on
the LCD will be present to warn the user when the voltage is
over 30V. Please remove the voltage from the circuit under test
before preceding the next step.
6). Release the TEST button. The upper right display holds the
resistance reading until a new test is started or a different
function is selected.
7). Exchange the red (+) and black (-) probes on the circuit and
repeat steps 5 and 6 to reverse the polarity of the test current.
The reading should be the same as the previous. This test is
useful to detect corroded connections, which can cause different
reading for both polarities.
4). The display will show “-----“ until the TEST button is pressed.
Press and hold the TEST key. The upper right display shows
the test voltage applied to the circuit under test. The main
display shows the resistance until a stable resistance reading is
displayed on the main display.
7-2 Using the LOCK Function to Measure Resistance
5). After releasing the TEST key the upper right display shows the
measured resistance and the circuit discharges through the
meter. The main display indicates the decreasing voltage.
Assure the probes remain in contact with the circuit until it is
completely discharged and “-----“ again appears on the main
display. The upper right display holds the resistance reading
until a new test is performed or a different function is selected.
The LOCK function is used to continuously supply the test
current to the circuit to be tested. This is useful for making
several measurements in succession, don’t need to push and
hold the TEST key for each measurement.
1). Press and hold the TEST button, then press the LOCK key to
enter LOCK mode.
2). Connect the probes to the desired test location in succession.
3). Press LOCK or TEST to disable the lock function. 8-2 Using the LOCK Function to Measure Insulation Resistance
4). The meter cannot indicate if the circuit is live in this mode.
Ensure that the circuit is deenergized before connecting the test
probes or the fuse may blow.
For long duration tests use the LOCK mode. This eliminates the
need to hold the TEST button for long periods.
1). Press and hold the TEST button, then press the LOCK key to
enter LOCK mode. In this mode, a potentially dangerous
voltage is continuously applied to the probes.
8. M Ω INSULATION RESISTANCE MEASUREMENTS
In this mode, if the probes are disconnected from the circuit, the
meter cannot discharge any potentially dangerous capacitive
voltages left on the circuit.
8-1 Measuring Insulation Resistance
Measuring insulation resistance requires the application of
potentially dangerous voltages to the circuit. This may include
exposed metal surfaces. In this mode the meter cannot indicate whether or not there is a
voltage present.
Ensure that the circuit is de-energized before connecting the test
probes.
Before proceeding, ensure that the installation is correctly wired
and no personnel are endangered by any test.
2). Press the LOCK or TEST key again to disable the Lock mode.
1). Set the function switch to the desired MΩ test voltage position.