Stanford Research Systems DS345, Manual

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Troubleshooting
4-5
Offset Cal Err2 4 The dc output offset control gain calibration did not converge, or went out of
range.
Offset Cal Err3 5 The ASIC amplitude DAC (U412A) offset calibration did not converge.
Offset Cal Err4 5 The system amplitude DAC(U109B) offset calibration did not converge.
Sine DC G Er 6 The sine wave path DC gain is outside of -40% to +25% from nominal, or the
calibration did not converge after the maximum allowed number of iterations.
Sqr DC G Err 6 The square wave path DC gain is outside of -40% to +25% from nominal, or
the calibration did not converge after the maximum allowed number of itera-
tions.
GPIB PROBLEMS
First, make sure that the GPIB interface is enabled. Press [SHIFT][GPIB] to
display the enable status line. GPIB should be "ON". If not, turn GPIB on us-
ing the MODIFY keys. Second, the GPIB address of the DS345 must be set
to match that expected by the controlling computer. The default GPIB ad-
dress is 19, and so it is a good idea to use this address when writing pro-
grams for the DS345. Any address from 0 to 30 may be set in the GPIB
menu. To check the GPIB address, press [SHIFT][GPIB] twice to view the
GPIB address. The entry keys or MODIFY keys may be used to set the GPIB
address.
The DS345 will ignore its front panel key pad when Remote Enable (REN)
has been asserted by the GPIB. This "REMOTE" state is indicated by the
REM LED. To return to LOCAL operation (ie. to enable the front panel) press
[STEP SIZE]. Controlling programs may inhibit the ability to return to LOCAL
operation by asserting the Local-Lockout state (LLO).
A linefeed character is sent with and End or Identify (EOI) to terminate strings
from the DS345. Be certain that your GPIB controller has been configured to
accept this sequence.
RS-232 PROBLEMS
First, make sure that the RS232 interface is enabled. Press [SHIFT][RS232]
to display the enable status line. RS232 should be "ON". If not, turn RS232
on using the MODIFY keys. Second, the RS-232 baud rate must be set to
match that expected by the controlling computer. The default baud rate is
9600 baud. The DS345 always sends two stop bits, 8 data bits, and no parity,
and will correctly receive data sent with either one or two stop bits.
When connecting to a PC, use a standard PC serial cable, not a "null-
modem" cable. The DS345 is a DCE (Data Communications Equipment) de-
vice, and so should be connected with a "straight" cable to a DTE device
(Data Terminal Equipment). The "minimum" cable will pass pins 2,3 and 7.
For hardware handshaking, pins 5 and 20 (CTS and DTR) should be passed.
Occasionally, pins 6 and 8 (DSR and CD) will be needed: these lines are al-
ways asserted by the DS345.