T R O U B L E S H O O T I N G A N D M A I N T E N A N C E
Troubleshooting Guide
01_10
FPM-8200
69
C H A P T E R
5
GPIB Problems
Symptoms
Corrective Actions
No response from a GPIB command
(remote light OFF).
•
Check that a GPIB cable is connected between the FPM−8200 and
the system controller (your computer). This cable should be less
than 3 meters (10 feet) long.
•
Press
LOCAL/ADR
to display the GPIB address for three seconds.
If it is not correct, change it by pressing
UP
or
DOWN
until you see
the correct address.
•
Check that your controlling software is sending commands to the
correct GPIB address.
•
Check that no two devices are set to the same GPIB address.
•
Make sure that there are less than 15 devices on the bus.
•
Check that total GPIB cable length is less than 20 meters.
•
Check the configuration of your GPIB controller card. See
Configuring the GPIB Controller on page 24.
•
Remove all other instruments from the GPIB bus to isolate the
FPM−8200. If this corrects the problem, re−connect one instrument
at a time until the problem returns. Then check the other
instrument for address conflicts, and proper GPIB function.
Slow or unexpected response to GPIB
commands
•
Check that no two devices are set to the same GPIB address.
•
Make sure that there are less than 15 devices on the bus.
•
Check the configuration of your GPIB controller card. See
Configuring the GPIB Controller on page 24.
•
Check that total GPIB cable length is less than 20 meters.
•
Remove all other instruments from the GPIB bus to isolate the
FPM−8200. If this corrects the problem, re−connect one instrument
at a time until the problem returns. Then check the other
instrument for address conflicts, and proper GPIB function.
No response from a GPIB command
(remote light ON).
•
Read the error queue remotely (
ERR?).
The command syntax or
command structure may be in error.
•
Read the status byte (
*STB?
) and condition register (
COND?
) for
possible device problems.
•
Check the configuration of your GPIB controller card. See
Configuring the GPIB Controller on page 24.
Bus hangs at a particular GPIB
command
•
Place a software timeout around the command in question
•
Check the syntax of the command
•
Make sure the controlling software is not requesting information
from the 8200 without first sending a query command.
•
Turn off other programs in your control computer. With some
operating systems, interrupts from other programs can affect bus
command timing.
•
Check the configuration of your GPIB controller card. See
Configuring the GPIB Controller on page 24.
•
Check that no two devices are set to the same GPIB address.
•
Make sure that there are less than 15 devices on the bus.
•
Check the configuration of your GPIB controller card. See
Configuring the GPIB Controller on page 24.
Summary of Contents for FPM-8200
Page 2: ......
Page 8: ...L I S T O F FIG U R E S vi FPM 8200...
Page 10: ...L I S T O F TA B L E S viii FPM 8200...
Page 16: ...WA R R A N T Y xiv FPM 8200...
Page 36: ...FR O NT PA N E L O P E R A T I O N Operating Guidelines 20 FPM 8200 C H A P T E R 2...
Page 96: ...80 FPM 8200 A P P E N D I X A...
