Protecting Against Overpowering; Instrument Maintenance - Keysight Technologies UXA N9040B Getting Started And Troubleshooting Manual

Quick Start
Instrument Information
If this prod uct is not used as specified, the protection provided by the
equipment could be impaired. This prod uct must be used in a normal cond ition
(in which all means for protection are intact) only.
Install the instrument so that the detachable power cord is read ily identifiable
and easily reached by the operator. The detachable power cord is the
instrument d isconnecting device. It d isconnects the mains circuits from the
mains supply before other parts of the instrument. The front panel switch is only
a stand by switch and is not a LINE switch. Alternatively, an externally installed
switch or circuit breaker (which is read ily identifiable and is easily reached by
the operator) may be used as a d isconnecting device.

Protecting Against Overpowering

The input circuitry of the analyzer can be damaged by applying signals that
exceed the maximum safe input level of +30 dBm average total power or +/-
0.2 Vdc (when DC coupled) or +/- 70 Vdc (when AC coupled). Refer to the
analyzer's specification guide for more details regarding the Maximum Safe
Input Level. Repairing damage to the input circuitry can be expensive.
If the analyzer will be used to measure signals which might be near the
maximum safe input level, use external attenuators and/or limiters to help
protect the analyzer input. The External Gain, amplitude Corrections, and/or
Ref Lvl Offset features may be used to compensate for the gains and losses of
external devices. External Gain and Corrections are under the Input/Output
menu and Ref Lvl Offset is under the AMPTD Y-Scale menu.

Instrument Maintenance

Cleaning the instrument
To prevent electrical shock, d isconnect the signal 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.
18 X-Series Signal Analyzers Getting Started and Troubleshooting Guide