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Turn-On Checkout - 4
43
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