Operation Model 8901B
6.
Automatic Level Control.
Use this special function
to
speed up the ALC response time
or
to
disable
the ALC. (The faster ALC response time degrades
AM
accuracy at
rates
less than
1
kHz.) Disabling
the
AX,
in conjunction with the rear-panel AM Output connector, can be used
to
measure
AM
at
very low modulation rates. Disabling the ALC
also
permits measurement of absolute changes in AM
depth without regard
to
changes in carrier level.
6.0 Slow ALC (for
AM
rates
greater than 20 Hz).
6.1
Fast
ALC (for AM rates greater than
1
kHz).
6.2 ALC
off.
7.
RF
Frequency Resolution.
Use this special function
to
manually set the display resolution during
frequency measurements (including RF,
IF,
and LO frequencies). Note
that
with finer resolution,
measurement time increases
.
7.0 Automatic selection.
7.1 Resolution of 10 Hz.
7.2 Resolution of 100 Hz. (When using an external LO value greater than 20 GHz, 7.1 SPCL
7.3 Resolution of
1
kHz.
7.4
selects 100 Hz resolution.)
(Applies
to
RF F’requency measurements only; other measurements treat 7.4
as
7.1.)
Resolution of
0.1
Hz for input
signals
less than 10.1 MHz; resolution of
1
Hz for
signals
from 10.1 MHz through 1300 MHz. (When measuring frequencies
as
high
as
1300 MHz,
measurement time with this resolution
is
approximately 20 seconds.)
8.Error
Message Disable Control.
Most combinations of Errors 01 through 04 can be disabled
.
or enabled
to
customize the behaviour of the instrument
to
meet a particular
set
of measurement
requirements. When the Modulation Analyzer uses automatic selection of error messages, these
messages are selectively enabled, depending on the measurement being made,
to
assure the broadest
range of calibrated measurements.
Error Message Disable Control
on page 3-233
has
a table that lists
the errors
8.0
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
that are automatically disabled during each measurement.
Automatic selection of disabled error messages.
Disables Error 01.
Disables
Errors
02 and 03.
Disables Errors 01, 02, and 03.
Disables Error
04.
Disables Errors 01 and 04.
Disables Errors 02, 03, and
04.
Disables Errors 01,02,03, and
04.
Performs the same function as
DISABLE
ERROR (Blue
Key, RANGE HOLD).
Enables Errors 01,02,03, and 04. This ensures
that
the output from MODULATION OUT-
PUT
is
safeguarded for most measurements. Some tuned, non-modulation measurement
modes (such as frequency) do not completely safeguard the signal fidelity
at
this output
since accurate demodulation
is
not the primary goal of that measurement mode.
This
special
function
is
not
available
with
firmware
date
codes
234.1985
and
below.
(To
display
the
firmware
date
code,
select
42.0
SPCL.)
To
order
a
ROM
set
that
contains
this
special
function,
contact
the
nearest
HP
sales
office.
3-242
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