HP 8591C Manual do Utilizador descarregar pdf (Página 170)

100

101

Increasing

the

Frequency

Readout

Resolution

Using

the

Marker

Counter

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. 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. 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 (MHz),

100 (MHz), and

SPEAK

SEARCH].)

Press

(MKR],

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.

3. Increase the counter resolution by pressing More

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

IkHz).

The

marker counter readout is in the upper-right corner of the screen. The

resolution can be set from 10 Hz to 100

kHz.

4. The marker counter remains on until turned off. Turn off the marker

counter by pressing

(MKR],

then MK COUNT ON OFF (until OFF is

underlined). (MARKER ALL OFF

also

turns the marker counter off.)

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