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Model 8902A
Operation
Instrument Preset
FUNCTIONS
Includes all Power-Up and Default Conditions and HP-IB Clear
DESCRIPTION
When first turned on (during power-up), the Measuring Receiver passes through a sequence of
internal checks before it is ready
to
make measurements. T h e results of these checks are indicated
internally
as
a service aid. (Refer to Section 8.) T h e running of the power-up sequence is indicated
to the user by lighting all front-panel indicators (burned-out
LEDs
are evident at this time). After
approximately
10
seconds, this sequence is completed.
When the Instrument Preset key
is
pressed, the instrument configures itself the same as during
power-up, but bypasses the internal checks.
T h e Measuring Receiver contains a battery back-up to its internal memory, which makes part o f the
memory non-volatile afler the power has been switched off (powered-down)-even if the power cord
is unplugged.
Information retained after power-down:
0
T h e 8 instrument states stored in the Store/Recall registers.
0
For R F Power:
a. One set of zero and calibration (SAVE CAL) data.
b. One tdble of 16 frequency/calibration factor pairs and the reference calibration factor used
c. One table of 22 frequency/calibration factor pairs and the reference calibration factor used
d. The state of Special Function 32.0 o r 32.1 (dB and frequency resolution).
with R F power sensors.
with microwave power sensors in the Frequency Offset mode.
o
For
Tuned
RF
Level:
a. Four calibration factors.
b. T h e frequency at which the calibration factors are valid.
c. T h e state of the R F High-Pass Filter, Wide IF Filters, and Narrow IF Filters a t the time
d. T h e state of Special Function 1.0 o r 1.9 ( R F input attenuator and gain).
e. T h e state of Special Function 32.0 o r 32.1 (dB and frequency resolution).
of calibration (Special Function 3).
t
For AM and FM:
An A M calibration factor and an FM calibration factor (both in disabled mode).
3-239
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