Agilent Technologies 8935 Series, Руководство пользователя

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Chapter 4 95
Preventative Maintenance
Hardware Maintenance
• Real Time Clock
The Test Set operates with a real-time clock that is user set. The
real-time clock consists of both a numerical date and a time-of-day
setting which may require changing due to repair (such as a battery
or hardware repair) or shipping to a different time zone. The clock
and date should be checked as part of routine maintenance. Incorrect
settings may be an indication of faulty battery backup.
The date and time settings are entered by using the INSTRUMENT
CONFIGURE screen. The
Date
field is a numerical number using
the MMDDYY format. The
Time
field is a numerical number using a
24-hour military standard (example: 3:00 pm is 15.00 in military
time). The date and time are maintained as part of RAM memory
with battery backup.
Cleaning
• The Test Set contains an internal air filter. The filter requires
periodic cleaning to remove dust and debris. Refer to “Cleaning the
Air Filter” on page 97 .
• RF assemblies A2A20 through A2A25 (see Figure 5-8 on page 113 )
should be removed and the bottom edges of the metal case cleaned
with isopropyl alcohol or a mild cleaner. Cleaning the metal edges
will insure that RF leakage protection is maintained.
Functionality
The Test Set has the capability to perform self tests for hardware
failure and functionality. The self test diagnostics should be run
whenever preventive maintenance, calibration, or repair has been
performed. Self test diagnostics will help to insure that the instrument
is performing reliably.
There are three diagnostic routines located in ROM of the Test Set:
Functional Diagnostics, AF Diagnostics, and RF Diagnostics. Run these
programs and follow the instructions listed on the screen. For
instructions on running these diagnostics routines, see
“Accessing the
Diagnostic Tests” on page 62 .