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Turn-On Checkout - 4
41
Procedure
Display
Explanation
23. Connect a jumper wire
across the + and -
terminals of output 2.
Shorts output 2 of the unit.
24. Press
Output On/Off
.
2
0.004V 1.520A
The
CC
annunciator is on, indicating that output 2 is in
constant current mode. Output 2 is sourcing current at
its maximum rating, which is the default current limit
setting.
25. Press
Current,
Enter Number,
<1>, Enter
.
2
CURR <1>
Programs the output 2 current to 1 ampere.
26. Press
Shift, OCP
2
0.001V 0.0003A
You enabled the overcurrent protection circuit. The
circuit then tripped because output 2 was operating in
constant current mode. The
CC
annunciator turns off,
and the
OCP
and
Prot
annunciators turn on.
27. Press
Shift, OCP
2
0.001V 0.0003A
You have disabled the overcurrent protection circuit.
The
OCP
annunciator turns off.
28. Press
Shift, Prot Clear
2
0.004V 0.998A
Restores output 2. The
Prot
annunciator turns off. The
CC
annunciator turns on.
29. Turn the unit off and
remove the shorting wire
from the output terminals.
The next time the unit turns on it will be restored to the
*RST or factory default state.
In Case of Trouble
Dc source failure may occur during power-on selftest or during operation. In either case, the display may
show an error message that indicates the reason for the failure.
Selftest Error Messages
Pressing the
Shift, Error
keys will show the error number. Selftest error messages appear as: ERROR
<n> where "n" is a number listed in the following table. If this occurs, turn the power off and then back
on to see if the error persists. If the error message persists, the dc source requires service.
Table 4-1. Power-On Selftest Errors
Error No.
Failed Test
Error 0
No error
Error 1
Non-volatile RAM RD0 section checksum failed
Error 2
Non-volatile RAM CONFIG section checksum failed
Error 3
Non-volatile RAM CAL section checksum failed
Error 4
Non-volatile RAM STATE section checksum failed
Error 5
Non-volatile RST section checksum failed
Error 10
RAM selftest
Error 11 to 14
VDAC/IDAC selftest 1 to 4
Error 15
OVDAC selftest
Error 80
Digital I/O selftest error