Model 8901B Operation
PROCEDURE
To cause the instrument
to
run through
its
internal checks and reset the instrument
to
its
default
state,
turn the instrument
off,
then on again.
To reset the Modulation Analyzer
to
its default state but bypass the internal power-up checks, select
INSTR PRESET (Blue Key, AUTOMATIC OPERATION),
or
issue a device clear command from an
HP-IB controller.
To initiate the internal power-up checks, select
40.0
SPCL.
HP-IB PROGRAM CODES
INSTR PRESET (Device Clear)
=
IP
SPCL
=
SP
The instrument can also be preset using the device clear bus command. (Refer
to
the
Remote
section
on page
3-24.)
COMMENTS
Setting the Instrument to a Known State
The Instrument Preset feature
is
a very simple means of setting the instrument
to
a
known
state
when
writing
test
procedures involving the Modulation Analyzer.
Losing Instrument States with a New Controller Assembly
After plugging in a new controller Assembly, some or
all
of the instrument
states
stored through
power-down may be non-existent.
If
this information
is
lost
a. The Recall function reverts to the Instrument Preset
state.
b. The RF Power measurement
will:
(1)
display Error
15,
(2)
light the UNCAL and RECAL
annunciators, and
(3)
use the default zero and calibration factors. (The
RF
power calibration
factors must be re-entered.)
c.
AM and FM calibration factors will be
100%
when enabled (using Special Function
16
or
17).
Instrument Preset Clears Pending Require Service Messages
When the instrument is preset, any pending Require Service Message
is
cleared. (For more details,
refer
to
Receiving the Clear Message, in Remote Operation.)
CLEAR Key
The HP-IB Clear message should not be confused with the front-panel CLEAR key or
its
CL HP-IB
code. The HP-IB Clear message presets the instrument. The CLEAR key clears the display and returns
the instrument to
its
previous
state.
Alternative to Turning the Instrument
Off
and then On
Use special function
40.0
to cause the Modulation Analyzer
to
pass
through
its
internal checks. (Special
function
40.0
is not accessible from the HP-IB.)
Instrument Preset 3-21
1
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