
Troubleshooting and Block Diagrams 8712ET/ES and 8714ET/ES
Category 4 Failures: Peripheral Device Problems RF Network Analyzers
4-40 Service Guide
General Checks for GPIB Systems
If the analyzer does not respond to an external controller, verify that the analyzer is in
talker/listener mode by pressing . The analyzer cannot
respond if it is in system-controller mode.
Make sure the controller is using the proper select code and addresses.
Be sure GPIB cable length limits are not exceeded. See your analyzer's User's Guide for
more detailed information.
Refer to the “GPIB Programming” chapter of the Programmer's Guide to troubleshoot
programming problems. Replace the CPU board if the analyzer appears to have a GPIB
problem.
LAN Troubleshooting
Problems with the LAN network can be difficult to solve. Software and protocol problems
can make it difficult to determine if the analyzer's hardware is working properly, or if there
is some 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.
Ping Command
The analyzer has the built-in capability of performing a “ping” operation. Ping will request
the analyzer to send a few bytes of information to a specific LAN device. That device will
then signal the analyzer that it has received the information. The analyzer computes the
approximate round trip time of the communication cycle and displays it. For a full test of
two-way communications, a ping test should be performed in two directions. The first
should be from the analyzer to the network. The second should be from the network to
the analyzer. In the second case, any other network device capable of sending a ping
command could be used, assuming it is connected to the same network. This could be a
computer or even another analyzer.
How to Ping
Follow the steps below to verify proper LAN operation (assuming you have a functioning
LAN). If no LAN is available, see “Testing between Two Analyzers” on page 4-42.
1. Make sure the IP address on the analyzer is set properly and that it is unique. Press
. The IP address of the analyzer should be
displayed. If it reads
0.0.0.0, then it has not yet been programmed. To program the IP
address, press and use the keypad to enter the new address.
2. Make sure the subnet mask is 0.0.0.0. If not, note the current setting and then set it to
0.0.0.0. This mask can be set by pressing
.
SYSTEM OPTIONS
SYSTEM OPTIONS
SYSTEM OPTIONS
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