User`s guide
Increasing the Frequency Readout Resolution Using the Marker
Counter
Note
This application cannot be performed using an HP
8590L
with Option 713 or an
HP 8592L with Option 713.
The marker counter increases the resolution and accuracy of frequency readout. When using
the marker count function, if the bandwidth to span ratio is too small (less than O.Ol), the
Reduce Span message appears on the display. If Widen RES BW is displayed, it indicates that the
resolution bandwidth is too narrow. Resolution bandwidths less than 300 Hz are not allowed if
you are using firmware with a revision date prior to 930506. If the signal being counted is the
largest signal within the 300 Hz bandwidth then the count will be correct. If there is another,
larger signal (even off the display), the count will be for the larger signal.
Example: Increase the resolution and accuracy of the frequency readout on the signal of
interest.
1.
2.
3.
4.
Place a marker on the signal of interest. (If you are using the CAL OUT signal, place the
marker on the 300 MHz calibration signal. Press
[FREQUENCY]
300
IIVIHz),
(SPAN]
100
m),
and
(PEAK
SEARCH].)
Press
(mFCTN),
then MK COUNT ON OFF (ON should be underlined) to turn the marker
counter on. COUNTER and the frequency and amplitude of the marker will appear in the
active function area.
Increase the counter resolution by pressing More 1 of 2 , CNT RES AUTO MAN and then
entering the desired resolution using the step keys or the number/units keypad. For
example, press 1
m.
The marker counter readout is in the upper-right corner of the
screen. The resolution can be set from 10 Hz to 100
kHz.
The marker counter remains on until turned off. Turn off the marker counter by pressing
(FCTNJ
then MK COUNT ON OFF (until OFF is underlined). (MARKER ALL OFF also turns
the marker counter off.)
43
CNTRCNTR 300 000300 000
MHzMHz
REF 0
d&r
REF 0
d&r
!iTTEld!iTTEld
1010
dBdB
-20
05
-20
05
dBrndBrn
PEAKPEAK
LOG
10
rlB/
Figure 3-6. Using the Marker Counter
3-6 Making Basic Measurements