Model 8901B Operation
Instrument Preset
FUNCTIONS
Includes all Power-Up and Default Conditions and HP-IB Clear
DESCRIPTION
When first turned on (during power-up), the Modulation Analyzer passes through
a
sequence of internal
checks before
it
is
ready to make measurements. The results of these checks are indicated internally
as
a service aid. (Refer
to
Section
8.)
The 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.
The Modulation Analyzer contains
a
battery back-up
to
its
internal memory, which makes part of the
memory non-volatile after the power has been switched
off
(powered-down)-even
if
the power cord
is
unplugged.
Information retained after power-down:
0
The
8
instrument
states
stored in the Store/Recall registers.
0
For RF Power:
a.
One set of zero and calibration (SAVE CAL)
data.
b. One table 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
or
32.1
(dB
and frequency resolution).
with RF power sensors.
with microwave power sensors in the Frequency Offset mode.
0
For AM and FM:
An AM calibration factor and an FM calibration factor (both in disabled mode).
Instrument Preset
3-209
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