Troubleshooting - Stanford Research Systems DS360 Operating Manual And Programming Reference

Troubleshooting

Nothing Happens on Power On
Make sure that the power entry module on the rear panel is set for the correct line
voltage, that the correct fuse is installed and that the line cord is inserted all the way into
the power entry module. The selected line voltage should be visible through the clear
window in the power entry module, just below the fuse, when the power cord is
removed.
Reset
If the unit becomes "hung" or inoperative, or displays no sensible message, a full reset
may fix the problem. To perform a full reset, hold down the [CLR] key while turning the
power on. This procedure initializes the RAM and recalls all factory calibration values. It
also distroys any stored settings. If you only want to return the instrument to it's default
state, press [RCL][0], which doesn't clear all stored data.
Unable to Set Parameters
Be certain that the unit is set for the correct mode (analog or digital) for the parameters
being adjusted (i.e. number of bits cannot be set in analog mode). This is true for both
front panel and computer operation. The output mode is indicated by the LED's in the
OUTPUT section.
GPIB Problems
Make certain that the GPIB address of the DS360 matches what the controller expects.
The address can set to any address from 0 to 30, however the default address is 8. If
possible it is a good idea to use this address, unless you are otherwise constrained. To
display the address, press [GPIB], and use the keypad or spin knob to modify it.
The DS360 will ignore its front panel keypad when Remote Enable (REN) is asserted by
the GPIB. This "REMOTE" state is indicated by the REM LED. To return to LOCAL
operation (ie to return control to the front panel) press the [LOCAL] key. Controlling
programs may inhibit the ability to return to LOCAL operation by asserting the Local-
Lockout state (LLO). The only way to return from this state is to release it over the GPIB
or by performing a total reset.
A linefeed character is sent with an End Or Identify (EOI), to terminate strings from the
DS360. Be certain that your controller has been configured to accept this sequence.
RS-232 Problems
Make certain that the baud rate of the controller and the DS360 agree. The baud rate can
be set from 300 to 19.2 k; the default is 9600. If it is practical, it is a good idea to use this
value. To display the baud rate press [RS232], and use the keypad or knob to modify the
DS360 Ultra Low Distortion Function Generator
Operation 3-21