C H A P T E R 1 4 - A T E D I T OR
AT5600 User Manual 98-119 issue 14 Page 348
14.6.23. IR - Insulation Resistance
The insulation resistance may be measured between any number of windings. A
DC voltage is applied across two groups of windings, with the windings in each
group being shorted together. The voltage and current are measured; dividing
the voltage by the current gives the insulation resistance.
On selecting ‘IR - Insulation Resistance’ from the available tests window, a form
fill-in dialogue box will be displayed:
To program the test:
1. Enter the test voltage.
2. Select (mouse click the button) the integration time you require.
'Medium' is the default setting. 'Long' will give more stable readings (for
tighter limits) at the expense of an increased test time, and 'Short' will test
at the maximum speed, but may give a slightly noisier reading. See 7.3
Explanation of Integration.
3. Enter the terminal names for the High and Low Terminals.
Click with the mouse to select a terminal from the Available list; then click
the ‘Add > ‘button to transfer it to the Used list.
(To correct a mistake, click with the mouse to select a terminal from the
Used list; then click the ‘< Remove’ button to transfer it back to the
Available list.)
4. Enter the minimum insulation resistance value in the bottom section.
Note: The combination of test voltage and minimum resistance must be
equivalent to a test current less than 1 mA.
The Measure button may be used here as outlined in section 14.5.9.
5. Select OK. The test specification will then be displayed in the program
window.
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