4-18 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting N5230C
Checking the SERIAL (RS-232), PARALLEL (1284-C), or VGA Port
To verify the proper operation of the SERIAL, PARALLEL, or VGA port:
• Connect a known good serial, parallel, or VGA peripheral device.
• Wait 15 seconds for the analyzer to verify the device connection, and then check the operation of the
peripheral device.
• If the peripheral device performs correctly, the port is functioning properly.
• If the peripheral device does not function properly, the A15 CPU board is faulty. Refer to “Removing and
Replacing the A15 CPU Board” on page 7-20.
Checking the GPIB Port
The network analyzer uses a National Instruments 488.2 GPIB controller and associated driver software.
This software includes a test utility that scans the GPIB bus and returns the status of all the connected
peripherals.
To run the test utility software and check the GPIB status:
1. Connect a known good peripheral to the analyzer using a known good GPIB cable.
2. On the
System menu, point to Configure, and then click SCPI/GPIB. A SCPI/GPIB dialog box is displayed.
3. In the
GPIB block, click System Controller to establish the analyzer as a controller. Wait for the analyzer to
configure, and then click
OK.
4. On the
System menu, click Windows Taskbar to open the Start Menu window.
5. On the
Start Menu window, point to Programs, National Instruments NI-488.2, and then click Explore GPIB to
open the
Measurement & Automation window.
6. On the left side of the
Measurement & Automation window under folders:
a. Click the plus sign to expand the
Measurement & Automation folder.
b. Click the plus sign to expand the
Devices and Interfaces folder.
c. Right click
GPIB0 (AT-GPIB/TNT) to open a submenu.
7. On the submenu, click
Scan for Instruments to run the test.
8. The state of all the peripherals found on the bus is returned.
9. If problems are detected, check the connections of all GPIB cables, and check all the GPIB addresses of
the instruments on the bus.
NOTE Address Information
• Each device must have its own unique address.
• The network analyzer’s default GPIB address in the controller mode is 21.
• The address set on each device must match the one recognized by the analyzer (and
displayed).
Refer to the manual of the peripheral to read or change its address.
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