Table 6-1.Description of Front Panel Controls, Indicators, and ConnectorsContinued
When this is activated, the frequency readout can be calibrated to center the center
frequency by adjusting the FREQUENCY control for the correct reading. When
accomplished, you should deactivate the CAL mode.
When this button is pressed, current through the local oscillator system is reduced
to zero in order to minimize magnetism build-up around the LOs. This is done to
enhance the center frequency display and amplitude accuracy. You should do this
after every significant frequency change and before calibrating the center
IDENTIFY 500 kHz
The signal identify feature can become functional only when the FREQ SPAN/DIV
is set to 500 kHz. When activated (button lit), true signals will change in amplitude
on every sweep. Images and spurious response signals will shift horizontally or go
completely off the CRT display. To ensure that the signal is changing amplitude
every sweep, you should decrease the sweep rate so that each sweep can be
When this control is activated (button lit), it will reduce residual FM when narrow
spans are selected. In narrow spans, the phase lock can be turned off or back on by
pressing the button. Switching the PHASE LOCK off may cause the signal to shift
position. In narrow spans, the signal could shift off the display; however, it will
usually return to its phase locked position after a few moments. The
microcomputer automatically selects PHASE LOCK for a span/division of 50 kHz
or below in bands 1 through 3, 100 kHz or below for band 3, and 200 kHz for
bands 5 and above.
This push button, when activated, will automatically select the bandwidth for
FREQ SPAN/DIV, TIME/DIV, and VIDEO FILTER. The internal microcomputer
selects the bandwidth to maintain a calibrated display. This can be checked by
changing the FREQ SPAN/DIV and observing the bandwidth change on the
This is a continuous detent control that selects the frequency span/div. The
span/div currently selected is displayed on the CRT. The range of the span/div
selection is dependent on the frequency band selected:
Two additional bands are provided: full band (max span) and 0 Hz span. When
max span is selected, the span displayed is the full band. When zero span is
selected, time/div is read out instead of span/div.
This is also a continuous detent control that selects the resolution bandwidth. The
bandwidth is shown on the CRT display. The range of adjustment is from 1 kHz to
1 MHz in decade steps. When you change the resolution bandwidth with this
control, it will deactivate the AUTO RESOLUTION.
These four push buttons select the display mode. The scale factor can be seen on
the CRT display.
When this is activated, the dynamic range of the display is calibrated to 80 dB,
with each major graticule representing 10 dB.