7
Insulation Tester
The Tester
Table 3. Display Features (cont.)
Item Description
11
Possible hazardous voltage is at the test terminals (L to E and V to COM)
12
Battery Status
13
Delete/Delete All
14
Save
15
Bar graph display of insulation resistance
16
V ac or V dc voltage indicator
17
Insulation and resistance measurement indicator
18
Text display; shows voltage, test current, capacitance, programmable
test voltages, and menu options
19
Memory Status
20
Pass/Fail
Guard Terminal Use
Note
Insulation resistance is measured between the Earth terminal (E) and
Live terminal (L) output connections. The Guard terminal (G) is at the
same potential as the E terminal but is not in the measurement path.
For most tests, use only two test leads. Connect the E and L test leads to the
corresponding inputs on the Tester. Connect the test lead probes to the circuit
under test. The Guard (G) terminal is left unconnected.
For the best accuracy when you measure very high resistances, use three-wire
measurements including G. G is at the same potential as E, and can be used to
prevent surface leakage or other unwanted leakage currents from degrading the
accuracy of the insulation resistance measurement.
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