R&S FS300, Operating Manual, Page: 101 / 248

R&S FS300 Spectrum Analyzer
Operating manual, 02/2006 6-101 E-1007.9900.15
6.2.3.1.2 Frequency Measurements using the Frequency Counter
Use
The normal marker indicates the frequency represented by the pixel on which
it is placed. The measurement uncertainty is relatively large because the
number of pixels is limited to 250.
When a measurement is made with the frequency counter, the sweep is
stopped at the frequency indicated by marker 1, the frequency is counted
using the required resolution (
1 KHz
,
100 Hz
,
10 Hz
,
1 Hz
) and then the
sweep is restarted. There must be a periodic signal at the marker position if
the measurement is to be successful.
Setting the
resolution 1.
Position marker 1 on the trace ( 6-98).
The current M1 marker values are displayed in the parameter field.
2.
Press the
function key
in the
submenu.
A selection field containing the available settings is displayed. The de-
fault setting is 100 Hz.
3.
Select a resolution for the internal frequency counter with
rotary
knob
[10], e.
g. 1 Hz.
The new setting is saved.
Measuring the
signal frequency
4.
Press the
function key
in the
submenu.
The frequency is counted with the internal counter. The result is dis-
played in the parameter field instead of the marker frequency (M1).
De-activating the
measurement
•
Press the
function key
in the
submenu.
The internal counter is turned off. The current M1 marker values are
again displayed in the parameter field.
NOTE
The absolute accuracy of the frequency measurement depends on the
frequency stability of the reference-oscillator. When the internal reference is
used, the accuracy is given according to the values specified in the data
sheet. ( 0-11).