18 Keysight NFA Series Noise Figure Analyzers Service Guide
Overview
Before You Start Troubleshooting
Before You Start Troubleshooting
Before troubleshooting, complete the following tasks:
— Familiarize yourself with the safety symbols marked on the instrument and
read the general safety considerations in the front of this guide.
— Read the ESD information below.
— Familiarize yourself with the troubleshooting information in Chapter 2,
“Boot Up and Initialization Troubleshooting,” and how it relates to
information on troubleshooting the other assemblies.
These servicing instructions are for use by qualified personnel only.
To avoid electrical shock, do not perform any servicing unless you
are qualified to do so.
The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the product from all voltage
sources while it is being opened.
The power cord is connected to internal capacitors that may remain
live for 5 seconds after disconnecting the plug from it’s power
supply.
The detachable power cord is the instrument disconnecting device.
It disconnects the mains circuits from the mains supply before other
parts of the instrument. The front panel switch is only a standby
switch and is not a LINE switch (disconnecting device).
Always position the instrument for easy access to the disconnecting
device (detachable power cord).
To prevent electrical shock, disconnect the analyzer from mains
before cleaning. Use a dry cloth or one slightly dampened with
water to clean the external case parts. Do not attempt to clean
internally.
This is a Safety Class 1 Product (provided with a protective earthing
ground incorporated in the power cord). The mains plug shall only
be inserted in a socket outlet provided with a protective earth
contact. Any interruption of the protective conductor inside or
outside of the product is likely to make the product dangerous.
Intentional interruption is prohibited.
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