DS335 Synthesized Function Generator

4-2 Troubleshooting
Syn Err
UART Error
The command syntax is invalid. See PROGRAMMING section for correct
command syntax.
The DS335 has detected an error on its computer interface option board.
Uni Err The units set with AMPL command are not V pp , or V rms .
Self-Test Errors
These errors may occur during the DS335's self- test. In general, these
messages indicate DS335 hardware problems. If the errors occur repeatedly
the unit may have an electrical problem. The messages are listed
alphabetically, also listed is the status value returned by the *TST
command.
Message Status Value Meaning
Cald Err 4 The RAM calibration data has become corrupt. The factory values will be
reloaded from ROM. This message is not a problem unless it occurs
frequently, which could indicate a problem with the battery backup circuits.
Code Err XX 2 The DS335's ROM has a checksum error. XX is the checksum value.
CPU Error 1 The DS335 has detected a problem in its Z80 CPU.
Prgd Err 6 Read/write test of modulation RAM (U400) failed. Can be bad RAM, ASIC,
or bus problem.
Sysd Err 3 CPU RAM (U206) failed read/write test.
Cal Dly Err 7 The DS335 is not warmed up. Wait until warmed up for at least two minutes
before starting autocal.
GPIB PROBLEMS
First, make sure that the GPIB interface is enabled. Press [SHIFT][1] to
display the enable status line. GPIB should be "ON". If not, turn GPIB on
using the UP/DOWN ARROW keys. Second, the GPIB address of the DS335
must be set to match that expected by the controlling computer. The default
GPIB address is 22, and so it is a good idea to use this address when writing
programs for the DS335. Any address from 0 to 30 may be set in the GPIB
menu. To check the GPIB address, press [SHIFT][1] twice to view the GPIB
address. The entry keys or the UP/DOWN ARROW keys may be used to set
the GPIB address.
The DS335 will ignore its front panel key pad when Remote Enable (REN)
has been asserted by the GPIB. This "REMOTE" state is indicated by the
REMOTE LED. To return to LOCAL operation (ie. to enable the front panel)
press [3]. 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 DS335. 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][2] to
display the enable status line. RS232 should be "ON". If not, turn RS232 on
using the UP/DOWN ARROW keys. Second, the RS-232 baud rate must be
set to match that expected by the controlling computer. The default baud
DS335 Synthesized Function Generator