4-18 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting N5227A
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.
Troubleshooting Systems with Controllers
Passing the preceding test indicates that the analyzer's peripheral functions are operating normally.
Therefore, if the analyzer has not been operating properly with an external controller, check the following:
• The GPIB interface hardware is incorrectly installed or not operational. (Refer to the embedded help in
your analyzer.)
• The programming syntax is incorrect. (Refer to the embedded help in your analyzer.)
LAN Troubleshooting
Problems with the Local Area Network (LAN) can be difficult to solve. Software and protocol problems can
make it difficult to determine whether the analyzer's hardware is working properly, or if there is a problem
with the LAN or cabling.
The purpose of this section is to determine if the analyzer's hardware is functioning properly. While the
turn-on self-test verifies some LAN hardware functionality, it is limited to internal testing only. Incorrect IP
addresses will prevent proper operation. Improper subnet masks may allow only one-way communication,
while improper gateway addresses may exclude outside LAN access.
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