Set the switches as indicated in Figure
(dark side of switch is depressed). The
address
switch is on the test set rear panel. The HP-IB address switch is easy to access but need not be
changed unless HP 8510 bus error messages are visible on the CRT. This switch is set to the binary
number 20 at the factory.
1
2
16
Figure 5-1.
Default
Switch Setting for All Test
Sets (20,
Binary)
If the ACTIVE LED on the front panel does not light within two seconds of turn on, or lights immediately,
the test set has not passed its self-test. You can determine what part of the self-test failed by
determining which HP-IB
on the A4 assembly are lit. The table below shows the possible self-test
failures:
Self-test
Indication
PWON
Fail ROM Test
Pass ROM Test
Fail RAM Test
Pass RAM Test
ON
OFF
OFF
OFF
OFF
A4 HP-18
TLK
SRQ
ON
ON
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
REM
ON
ON
ON
ON
OFF
Elapsed lime
After Turn-on
(in seconds)
0 to 0.5
on briefly
0.52 to 2.0
after 2
Two seconds after turn-on all four HP-IB
should go off, and the front panel ACTIVE LED should
light simultaneously. After going out briefly, the HP-IB
will light according to the state of the test
set. If you are using multiple test sets, the first test set in line will be the active test set until another is
chosen.
If the portion of memory which contains the self-test programming is faulty, the self-test will not run
properly. The following conditions indicate that the self-test ROMs are faulty:
all
flash briefly and go off
l
all
flash briefly and stay on
l
ACTIVE LED goes on before HP-IB
go out
l
ACTIVE LED does not go on at all (check LED operation before proceeding)
HP
Test Sets
Test Set Troubleshooting
5-3