Agilent Technologies PNA Series User Manual

4-24 Service Guide E8361-90001
Troubleshooting PNA Series Microwave Network Analyzers
Rear Panel Troubleshooting E8361A
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.
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.
• First: you should ping from the analyzer to the local area network.
• Second: you should ping from the local area network to the analyzer.
NOTE 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 from the Analyzer to the Local Area Network (LAN)
Follow the steps below to verify proper LAN operation (assuming you have a functioning
LAN). If no network LAN is available, see “Testing Between Two Analyzers” on page 4-26.
1. Make sure the IP address on the analyzer is set properly and that it is unique. If unsure
how to check the IP address, refer to the embedded help in the analyzer.
2. Make sure the subnet mask is 0.0.0.0. If not, note the current setting (to allow setting
it back later) and then set it to 0.0.0.0.
3. Find and note the IP address of another working LAN device on the same network.
Make sure this device is turned on, connected, and is functioning properly.
4. To ping the network device:
a. On the
System menu, click Windows Taskbar.
b. On the
Windows Taskbar menu, point to Programs, Accessories, and then click
Command Prompt.
c. The command prompt window is displayed.
d. At the prompt, type ping xxx.xxx.xxx.xxx
1
and press Enter on the front panel or
keyboard. Refer to Step 5 for the results of a successful ping.
1. The letters x represent the IP address of the other device on the network.

Agilent Technologies PNA Series Specifications

General

Number of Ports	2 or 4, model dependent
Calibration	SOLT, TRL
Impedance	50 Ohm
IF Bandwidth	1 Hz
Power Requirements	100 to 240 VAC, 50/60 Hz

Summary

Safety and Regulatory Information

General Safety Considerations

A list of safety points to consider when servicing your network analyzer.

Electrostatic Discharge Protection

A discussion of electrostatic discharge (ESD) and related recommendations and requirements for ESD protection.

Tests and Adjustments

About System Verification and Performance Tests

Details on system specifications, instrument specifications, verification procedures, and performance tests.

ANSI/NCSL Z540–1–1994 Verification

The ANSI/NCSL Z540-1-1994 process of verifying your analyzer.

System Verification

Procedure to verify system-level, error-corrected uncertainty limits for network analyzer measurements.

Performance Tests (Agilent N2721A Software Package)

Verifies electrical performance of the analyzer using the N2721A software package.

Adjustments

Firmware-driven tests to fine-tune your analyzer for optimum response.

Troubleshooting

Protect Against Electrostatic Discharge (ESD)

Important precautions against electrostatic discharge to prevent analyzer damage.

Getting Started with Troubleshooting

Guidance on how to begin the troubleshooting process based on failure symptoms.

Power Up Troubleshooting

Procedures to diagnose and resolve issues related to analyzer power-up.

Front Panel Troubleshooting

Procedures to verify and troubleshoot the front panel assembly components.

Rear Panel Troubleshooting

Procedures to troubleshoot issues related to rear panel connectors and associated hardware.

Measurement System Troubleshooting

Procedures to isolate faulty functional groups within the measurement portion of the analyzer.

Theory of Operation

Network Analyzer System Operation

A general description of the operating theory for the PNA series microwave network analyzer.

Synthesized Source Group

Theory of operation for the synthesized source group, including frequency range and output power.

Signal Separation Group Operation

Theory of operation for signal separation, including assemblies like the switch and couplers.

Receiver Group Operation

Theory of operation for the receiver group, covering mixers, modules, and motherboard.

Frequency Offset Group Operation (Option 080)

Theory of operation for the frequency offset group, enabling different source and receiver tuning.

Digital Processor and Digital Control Group Operation

Theory of operation for digital control, covering front panel and data acquisition subgroups.

Power Supply Group Operation

Theory of operation for the power supply assembly, detailing its DC output voltages.

Replaceable Parts

Assembly Replacement Sequence

The correct sequence for replacing an assembly in the network analyzer.

Repair and Replacement Procedures

Before Starting the Removal and Replacement Procedures

Warnings, cautions, and the assembly replacement sequence before starting repairs.

Removal and Replacement Procedures

Detailed procedures for removing and replacing major assemblies in the analyzer.

Post-Repair Procedures

Tests, verifications, and adjustments to perform after repairing an assembly.

Removing the Covers

Procedure for removing the outer and inner covers of the analyzer.

Raising and Removing the Receiver Deck

Procedure for raising, lowering, removing, and replacing the receiver deck.

Removing and Replacing the Front Panel Assembly

Procedure for removing and replacing the front panel assembly.

Removing and Replacing Front Panel Subassemblies

Procedures for removing and replacing subassemblies within the front panel.

Removing and Replacing the Display Inverter Board and the Display Lamp

Procedures for removing and replacing the display inverter board and the display lamp.

Removing and Replacing the A4 Power Supply Assembly

Procedure for removing and replacing the A4 power supply assembly.

Removing and Replacing the A6, A8, A9, and A10 Boards

Removing and Replacing the A11 Phase Lock Board

Removing and Replacing the A12 Source 20

Removing and Replacing the A13 Frequency Offset Receiver Assembly

Removing and Replacing the A14 System Motherboard

Removing and Replacing the A15 CPU Board

Removing and Replacing the A16 Test Set Motherboard

Removing and Replacing the A17 LOMA 12

Removing and Replacing the A18 MA 24

Removing and Replacing the A19 Splitter

Removing and Replacing the A20 LODA

Removing and Replacing the A21 SOMA 50

Removing and Replacing the A22 Switch

Removing and Replacing the A23 and A24 SOMA 70s

Removing and Replacing the A25 and A26 Test Port Couplers

Removing and Replacing the A27, A28, A29, and A30 First Converters (Mixers) and Mixer Bias Board

Removing and Replacing the A31, A32, A33, and A34 Receiver Modules and LO Reject Filter Board

Removing and Replacing the A35 Receiver Motherboard

Removing and Replacing the A40 Floppy Disk Drive

Removing and Replacing the A41 Hard Disk Drive

Disassembling the HDDA

Installing the New A41 Hard Disk Drive

Removing and Replacing the Midweb and the B1 Fan

Removing the Midweb

Removing the Fan

Removing and Replacing the USB Hub

Error Terms

Using Error Terms as a Diagnostic Tool

Directivity (EDF and EDR)

Source Match (ESF and ESR)

Load Match (ELF and ELR)

Reflection Tracking (ERF and ERR)

Transmission Tracking (ETF and ETR)

Isolation (EXF and EXR)

C Firmware Upgrades

D Operating System Recovery

System Recovery Procedure

Step-by-step instructions to restore the operating system to factory condition.

If the Operating System Does Not Boot From the Hard Disk Drive

Procedure to follow if the analyzer cannot boot from the hard disk drive.

If the Operating System Does Not Boot From the Floppy Disk Drive

Procedure to follow if the analyzer cannot boot from the floppy disk drive.