Operation Model 8901B
15. Time Base Check.
Use this special function
to
check the status of the time base being used by
the Modulation Analyzer. (More information about the time base
is
on page 3-3.)
15.0 Display whether the internal, Option 002 time base oven
is
warm enough
to
create
a
stable
15.1 Display whether the internal
or
external time base
is
being used;
0
=
internal and
source;
0
=
warm. Error 12
is
displayed
if
the time base
is
cold.
1
=
external.
16. AM Calibration Factor.
This special function enables you
to
disable, enable,
or
display the current
AM calibration factor. F'ront-panel keys SAVE CAL (Blue Key, CALIBRATE) and
%
CAL FACTOR
(Blue Key, MHz) can also be used
to
enable and display the calibration factor. (For
a
complete procedure
for AM calibration, refer
to
AM
Calibration
on page 3-141.)
16.0 Disable the AM calibration factor.
16.1 Enable the AM calibration factor.
16.2 Display the AM calibration factor. (Displays
0
if
not enabled.)
17.
FM Calibration Factor.
This special function enables you
to
disable, enable,
or
display the current
FM calibration factor. Front-panel keys SAVE CAL (Blue Key, CALIBRATE) and
%
CAL FACTOR
(Blue Key, MHz) can also be used to enable and display the calibration factor. (For a complete procedure
for FM calibration, refer
to
FM
Calibration
on page 3-155.)
17.0 Disable the FM calibration factor.
17.1 Enable the FM calibration factor.
17.2 Display the FM calibration factor. (Displays
0
if
not enabled.)
18." Tone Burst Receiver.
Use this special function
to
measure the frequency of squelch tones.
A
time delay of NN ms
is
inserted between detection of
a
carrier and unsquelching of the output
at
the
MODULATION OUTPUT connector. The range of NN
is
1
to
99
ms.
If
NN
is
0,
the delay
is
99 ms.
(Refer
to
Tone Burst Receiver
on page 3-165 for more information about this function.)
21.
HP-IB
Address.
Use this special function
to
display the HP-IB address in the form:
AAAAAAA.TLS., where:
AAAAAAA
is
the address in binary,
T
=
1
=
talk only,
L
=
1
=
listen only, and
S
=
1
=
requesting service.
22. Service Request.
Use this special function
to
set up
a
service request mask.
A
value of NN from
0
to
63 sums the weighted conditions below
to
set up a service request
mask.
The summed, weighted
conditions are displayed when NN
is
64. Refer to page 3-29 for more information about this service
request mask.
1
Data ready
2
HP-IB error (cannot be disabled)
4
Instrument error
8
Limit exceeded
16 Frequency Offset mode
state
change
32 RECAL
or
UNCAL
64 read back SRQ mask
3-244
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