Operation
Model
8901B
NOTE
The CLEAR key (CL) does not perform any of the functions
of
the Clear
message (DCL or SDC).
Clear
The Modulation Analyzer responds to the Clear message (DCL and SDC) the same way
it
responds
to Instrument Preset (IP). The Clear message clears
any
pending Service Request message
and
clears
the
SRQ
Mask
(22.0SP).
The settings the instrument will assume
after
receiving the Clear message
are listed below in Table
3-8.
Refer to “Instrument Preset”
in
Detailed Operating Instructions
on
page
3-209
for more information on the Instrument Preset default conditions.
The Clear message
also
clears any incomplete message
or
entries.
For
example,
“M5100”
(RF
Frequency
Measurement,
100,
no terminator) would be cleared because
no
units terminator
has
been entered.
!&Me
3-8.
Response to a Clear Message
Parameter
High-Pass Filters
Low-Pass Filters
FM
De-emphasis
Pre-display
Calibration
Measurement
Detectors
Ratio
Limit
Lower Limit Reference
Upper
Limit
Reference
Limit
Measurement Mode
Automatic Operation
Manual Operation
MHz
Input
Frequency
fi
and
JJ
Step Size
SPCL
Modulation Output
Service Request Mask
Status Byte
Trigger Mode
Setting
All
Off
All
Off
Off
Off
Off
Frequency
Peak
+
Off
Not Enabled
150
kHz
1300
MHz
Frequency
On
Automatic
Tuning
0
kHz
Special Functions prefixed
1
through
10
in
zero-
suffix
mode; all others off
FM
(least sensitive range)
HP-IB
code error enabled only
(22.2SP)
Cleared
Free-run
(TO)
If
MHz (code
MZ)
is selected immediately after the Clear message
is
received
or after power-up, the Modulation Analyzer will tune
to
100
MHz.
3-24
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