Instruction manual

4-11. Cleaning
CAUTION
Do not use aromatic hydrocarbons or
chlorinated solvents for cleaning. These
solutions will react with the plastic materials of
the instrument.
4-12. Clean the front panel and case with denatured
alcohol
or a mild solution of detergent and water. Clean
-dust from the interior
of the instrument with dry, low
pressure air
(20 psi). Contaminants can be washed from
the circuit board with demineralized water and a soft
brush (avoid getting excessive amounts of water on the
switches).
4-13. Fuse Replacement
4-14. The 8922A has one replaceable fuse located on the
rear panel which may be replaced with a l / 8 amp,
slo-bl~
fuse (Metric uses 5x20 mm, l / 8 amp slow acting).
4-15. PERFORMANCE TEST
NOTE
In the following procedures the instrument
(8922A) which
is being either checked or
calibrated
is referred to as the UUT (Unit
Under Test).
4-16. The following paragraphs comprise a
performance verification test which compares the
instrument's performance to the specifications given in
8922A
Section 1 of this manual. The test is recommended as an
acceptance test when the instrument is first received and
later as a calibration procedure to verify instrument
accuracy at the scheduled calibration periods (90-days).
It
can also be used as an aid in troubleshooting. Test
equipment required for the performance test
is listed in
Table
4-1. If the recommended test equipment is not
available, equivalent test equipment may be substituted.
To insure optimum results, the test must be performed
at
an ambient temperature between 18 and 28 degrees
Celsius with a relative humidity
of 80%. Allow the
instrument to warmup
at least 30 minutes, with the case
cover in place, before attempting the performance test.
4-17.
If the instrument fails to meeet the performance
test limits, calibration adjustment,
troubleshooting,
and/ or repairs are indicated. Procedures for calibration
adjustments and troubleshooting are given later in this
section
of this manual.
NOTE
In all of the procedures in this section,
precautions should be taken to minimize
ground currents, stray fields, etc.
4-18. Low and Midband Performance
Check (Volts Display Mode}
4-19. This procedure will verify tha~ the UUT's low and
midband performance is within the limits specified in
Section
I. Set up the test equipment as shown in Figure
4-1, and select the required function and input signal as
indicated
in Table 4-3. Note any deviation between the
UUT performance and the specified limits.
LINEAR
ANALOG
OUTPUT
8922A (REAR)
SHIELDED
CABLE
POWER AMP
(5205)
\
8922A (FRONT)
NOTE:
WHEN TESTING THE 8922A A BANANA TO
BNC ADAPTER MUST BE USED (POMONA 1296)
Figure 4-1. Low and Midband Performance Test Set-Up
DVM
(8600A)
4-3