Advertisement
Operation
Model 8902A
R F
Frequency Resolution
FUNCTIONS
Special Function 7 (RF Frequency Resolution)
DESCRIPTION
When making R F measurements, the frequency resolution can be manually set using Special
Function 7.
When R F frequency measurements are made, the Measuring Receiver normally updates the display
five times each second. The instrument automatically selects 10
H z
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. Use the
numeric keyboard and the SPCL key to set the frequency resolution to either 1000. 100, or 10
H z .
(A resolution of 0.1
H z
or
1
H z
can be selected for R F frequency measurements.)
Special Function 7
sets
the measurement resolution for RF Input Frequency, RF Frequency Error,
I F Frequency, and
LO
Frequency Measurements.
PROCEDURE
To set the fieqiiency 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 I kHz.
7.4
(Applies to RF Frequency measiirements 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 MHt. (When measuring frequencies as high as 1300 MHz, measurement
time with this resolution is approximately 20 seconds.)
COMMENTS
Change Resolution Any Time.
The Measuring Receiver 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 spccial function is not availablc with firmwarc datc codcs 234.1985 and below. (To display the firmwarc datc codc. sclcct
42.0
SPCL.)
To order
a
ROM
set that contains this spcdal runction. contact thc ncarest HP salcs orficc.
3-157
Advertisement
Chapters
