Stanford Research Systems DS345, Manual

Page: 60 / 139

Programming Commands
3-10
Hardware Test and Calibration Commands
NOTE:
These commands are primarily intended for factory calibration use and should never be needed dur-
ing normal operation.
Incorrect use of some of these commands can destroy the calibration of the
DS345.
*CAL?
The *CAL? common query initiates the DS345's self calibration routines.
When the calibration is complete the status of the calibration is returned.
The status may have the following values (see
TROUBLESHOOTING
sec-
tion for more detail): Status value
Meaning
0 No Error
1 DS345 not warmed up. At least 2 minutes must elapse
between power on and calibration.
2 Self-Test Fail. The DS345 must pass its self tests be-
fore calibration.
3 A/D Cal Error. The DS345's A to D converter could not
be calibrated.
4 DC Offset Fail. The DS345 was unable to calibrate its
DC offset.
5 Amplitude Cal Fail. The DS345 was unable to calibrate
its amplitude control circuitry.
6 Doubler Cal Fail. The DS345 was unable to calibrate
the doubler offset or the gain of the doubler/square wave
signal path.
*TST?
The *TST? common query runs the DS345 internal self-tests. After the tests
are complete the test status is returned. The status may have the following
values (see the
TROUBLESHOOTING
section for more details):
Status value Meaning
0 No Error
1 CPU Error. The DS345 has detected a problem in its
CPU.
2 Code Error. The DS345's ROM firmware has a check-
sum error.
3 Sys RAM Error. The system RAM failed its test.
4 Cal Data Error. The DS345's calibration data has be-
come corrupt.
5 Function Data Error. The waveform RAM failed its test.
6 Program Data Error. The modulation program RAM
failed its test.
7 Trigger Error. The trigger detection circuits failed their
test.
8 A/D D/A Error. Either the A/D or one of the D/A's failed
its test. The front panel message is more specific.
9 Signal Error. Either the waveform DAC, amplitude con-
trol, or the output amplifier has failed.
10 Sync Error. The sync signal generator has failed.
11 Doubler Error. The frequency doubler has failed.
$ATD? i,j
The $ATD? query uses the DS345 A/D converter to measure the voltage on
analog channel i. The parameter j = 0 returns the raw data value, j=1 returns
the value corrected for the A/D's offset, and j=2 returns the value corrected
for the A/D's offset and gain errors.