HP 8901B Operation And Calibration Manual page 240

Model 8901B
Operation
RF Frequency Resolution
FUNCTIONS
Special b c t i o n 7 (RF Frequency Resolution)
DESCRIPTION
When making
RF
measurements, the frequency resolution can be manually set using Special h c t i o n 7.
When
RF
frequency measurements are made, the Modulation Analyzer normally updates the display
five times each second. The instrument automatically selects 10 Hz resolution for frequencies below
approximately 2.5 MHz; 100 Hz resolution for frequencies from approximately 2.5
to
approximately 320
MHz; and 1000
H z
resolution for frequencies greater than approximately 320 MHz.
U s e
the numeric
keyboard and the SPCL key
to
set the frequency resolution
to
either 1000,100, or 10 Hz.
(A
resolution
of 0.1 Hz or 1 Hz can be selected for RF frequency measurements.)
Special finction 7 sets the measurement resolution for
RF Input Frequency, RF Frequency Error, IF
Frequency, and
LO
Frequency Measurements.
PROCEDURE
To
set the frequency resolution
to
a selected range or
to
re-enter the automatic selection mode, key in
the corresponding Special Function code, then SPCL (Note that with finer resolution, measurement
time increases.)
7.0 Automatic selection.
7.1 Resolution of 10 Hz.
7.2 Resolution of 100 Hz.
7.3 Resolution of 1 kHz.
7.4
(Applies to RF Frequency 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
H z
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.)
COMMENTS
Change Resolution Any Time
The Modulation Analyzer need not be making RF frequency measurements in order
to
change
resolution modes; however, the resolution mode only affects RF frequency-related measurements.
Counter accuracy is the reference accuracy +3 counts.
RF Frequency Measurements Greater Than 20 GHz
When making RF frequency measurements greater than 20 GHz, 7.1 SPCL selects 100 Hz resolution.
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.
RF Frequency Resolution 3-131