HP (Hewlett-Packard) 22A 用户手册

The synthesizer has five frequency markers that can be used as fixed
frequency “landmarks,” or as variable frequency pointers on a CRT
display. To view the marker features of the synthesizer on a CRT,
connect the synthesizer as shown in Figure 1-8.

Refer to menu map 2, FREQUENCY.
Press [PRESET).
Press (START) 

 

Press (STOP) 

 

Press [MARKER).

Select Marker Ml and enter 

 

The synthesizer is sweeping from 3 to 7 

 with a 100 ms sweep

speed. A frequency marker is set at 4 

 which causes an

intensified dot to appear on the CRT. To obtain an amplitude spike

at that frequency, select 

 Markers . Notice that you can set the

amplitude of the spike with the rotary knob or entry keys. To return
to the intensified dot representation, select 

 Markers (asterisk

off).

Amplitude markers increase the output power at the marker
frequency. Provide protection to devices that could be damaged.

For a second marker, select Marker 

 and enter 

 

 

 

This process can be continued for all five markers. Note that the
marker displayed in the active entry area is “active” and can be
controlled by the rotary knob, arrow keys, and numeric entry keys.

Once the Ml and 

 markers are established, the marker sweep

function, 

 

 

Sweep, 

temporarily changes the original

start/stop frequencies to those of markers Ml and 

 Select

 Sweep. Notice that the synthesizer now is sweeping from

4 to 5.5 

 Use this function to focus in on a selected portion

of the frequency sweep. Select 

 Sweep again. This turns

the function off and returns the synthesizer to its original sweep
parameters. To change the start/stop frequencies for the synthesizer,

not just temporarily, use the 

 

 

 .

As an example of the delta marker function:

Select Marker 

 and enter 

 

 

 

Select Delta Marker.

The frequency difference between marker 3 and marker 1 is displayed,
and the CRT trace is intensified between the two markers. The active
entry area displays:

 DELTA MKR 

 : 2700.000000 MHz