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Performing the Interlock Circuit Test
To confirm that interlock circuit test, do as follows:
1. Connect the Intlk terminal of HP 4155/4156 to your interlock circuit.
2. Press
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System
front-panel key, then select
SYSTEM: SELF-CALIBRATION/DIAGNOSTICS page.
3. In the CALIB/DIAG field, select
4. In the CATEGORY field, select
5. Move pointer to the 403 (INT.) Interlock & LED field.
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EXECUTE secondary softkey.
6. Select
7. Confirm the following:
LED turns on within 1 sec from when interlock circuit is shorted.
LED turns off within 1 sec from when interlock circuit is open.
8. To stop the interlock test, select
Servicing the Test Fixture
This section provides information for trained service personnel to repair the test fixture.
"Replaceable Parts" provides the HP part numbers of replaceable parts. When a part needs
to be replaced, order the parts from the nearest HP Sales and Service Office.
Warning
High voltages may be present in the test fixture when voltage or current is
added to the test fixture. Dangerous voltage may be generated on wires or
parts and the danger of electric shock exists.
Make sure that terminals are not connected to the instruments before you repair the
test fixture. When you remove the bottom cover, loosen the four flathead screws using a
screwdriver, as shown in Figure 1-4.
12 HP 16442A User's Gude
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CALIB/DIAG primary softkey to display the
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DIAG secondary softkey.
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I/O & PERIPH secondary softkey.
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STOP secondary softkey.
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