Table 6-1.Description of Front Panel Controls, Indicators, and Connectors
This knob controls the brightness of the CRT trace and the CRT readout display.
The focus is electronically adjusted.
This push button switches the readout display on and off. All spectrum analyzer
parameters are displayed except TIME/DIV. The brightness for this display is
proportional to the trace brightness and can be readjusted on internal controls only
by a qualified technician.
This push button switches the graticule light on and off.
This push button, when activated, clips (subdues) the intensity at the baseline.
This area allows one of four triggering modes to be selected by push buttons that
illuminate when active. When any of these four are selected, the others are
When activated, the sweep is free-running without regard to trigger signals.
When activated, the sweep is triggered by any signal at the left edge of the display
with an amplitude of 1.0 divisions of the graticule or more.
When activated, a sample of the ac power line voltage is used to trigger the sweep.
When selected, the sweep is triggered by an external signal (applied through the
back panel IN HORZ/TRIG connector) between a minimum and maximum of 0.5
and 50 volt peak.
This push button, plus a ready indicator (No. 7), provides the single sweep
operation. When this operation is selected, one sweep is initiated after the sweep
circuit has been triggered. Pushing this button does not cancel the other trigger
modes. When single sweep is first selected, the present sweep is aborted, but the
sweep circuit is not yet armed. An additional push is required to initially arm the
sweep. The button must be pushed again to rearm the sweep circuit each time the
sweep has run. To cancel single sweep, you must select one of the four trigger
When single sweep is selected, this indicator lights while the sweep circuit is
armed and ready for a trigger signal. The indicator stays lit until the sweep is
When the TIME/DIV (No. 9c) selector is in the MNL position, this control will
manually vary the CRT beam across the full horizontal axis of the display.
Is used to select sweep rates from 5 VHF GLY WR VHF GLY 7KLV VZLWFK DOVR
selects AUTO, EXT, and MNL modes.
In this position, the sweep rate is selected by the microcomputer to maintain a
calibrated display for any FREQ SPAN/DIV, RESOLUTION, and VIDEO
When selected, this control allows an external input source to be used with the
When selected, this control is used in conjunction with No. 8 (see MANUAL
SCAN, No. 8).
This control is manually turned to allow you to tune to the center frequency.
These two push buttons are used to shift the center frequency up or down.
Frequency range on the band is displayed on the CRT readout.
This control is used for measuring the frequency difference between signals. When
selected, the frequency readout goes to zero. It will then read out the deviation
from this reference to the next frequency desired as the FREQUENCY knob is