HP 3585A Service Manual page 51

Model 3585A
Offset Function
OFFSET
The
function allows you to quickly and easily measure the relative frequency and
0
amplitude between two signals of interest or between any two points within the measurement
range of the instrument. It can be used in conjunction with the
make relative measurements at the Marker or Manual frequency; it will operate with
tU
COUNTER
the function to count the frequency difference between two signals; and it will also
operate in conjunction with the
For example, to measure the frequency and amplitude of a harmonic relative to th e fun­
damental:
Set the Marker to the peak of the fundamental
a .
response with
and then press
Set the Marker to the peak of the harmonic
b.
r e s p o n s e w i t h
" OFFSET" reading.
( Offset amplitude
displayed only in "dB" . A sta­
tionary marker
point on
represents the Offset reference
frequency. )
NOISE LVL
function to measure signal-to-noise ratio .
0
0
, activate
OFFSET
MARK["
0 0
0
o b s e r v e t h e
readings are
remains at the
the CRT trace that
MARKER
or
0
REF . 0 dBm OFFSET . 0 Hz
10 dB/D I V
RANGE . 0 dBm
, ,
t
- - - - - - - -
START 1 50 000. 0 Hz
RBW 30 KHz V�W 3 KHz
REF . 0 dBm OFFSET
10 dB/D I V RANGE . 0 dBm
, . ,
,
, ,
----t----
, ,
:
START 1 50 000. 0 Hz
RBW 30 KHz VBW 3 KHz
Operation Overview
IMN SWEEP
function to
0
. 0 dB
STOP 40 000 000. 0 Hz
ST 1 . 4 SEC
1 0 998 600. 0 Hz
-64. 5 dB
STOP 40 000 000. 0 Hz
ST 1 . 4 SEC
3-19