Signal Output

HP-IL loopback test

Figure 5-12

 

 

ACTUAL

SETPOINT

 

 

 

 

HPIL

LOOPBACK

TEST

 

 

 

ACTUAL

SETPOINT

 

 

 

PASSED SELF

TEST

 

 

 

ACTUAL

SETPOINT

 

 

 

 

FAILED

SELF

TEST

 

HPIL LOOPBACK TEST Displays

The message PASSED SELF TEST indicates INET, at least with respect to the HP 5890, is performing satisfactorily. If FAILED SELF-TESTis displayed, a bad cable may be indicated; install a different INET cable and repeat the test. If FAILED SELF-TESTis displayed again for a second cable, electronic problems within the HP 5890 are indicated.

Note: The loopback test may be used to check for continuity in an INET cable; an open cable causes test failure. Verify that the cable is at fault (rather than the HP 5890) by testing a second cable.

If an intermittent cable problem is suspected, the test may be repeated as necessary while flexing the cable (particularly at its plugs). An ohmmeter should also be used to test for problems; it is a reliable method for testing continuity.

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