Motorola R-2001D Operator's Manual page 26

TABLE 2-1. CONTROLS, INDICATORS, AND CONNECTORS
ITEM
OSCILLOSCOPE section:
DESCRIPTION
FRONT PANEL (figure 2-1)
FUNCTION
'----,
Horiz switch
Horiz vernier control
Ext Horiz
Trig Level
Position controls
Seven-position rotary
switch
Potentiometer
BNC connector
Stacked concentric
potentiometer and switch
Concentric
potentiometers
When in the oscilloscope mode, selects the horizontal
sweep rate or external horizontal input.
Horizontal sweep rate vernier or external horizontal input
gain vernier. Calibrated position is fully clockwise.
Allows external horizontal inputs for oscilloscope. High in-
put impedance.
Selects oscilloscope trigger level and trigger mode. Center
knob selects the level of trigger. Outside (largest) knob con-
trols the trigger mode. In Auto position, continuous sweep
with no vertical input signal, syncs on vertical input. Nor-
mal position, no sweep unless vertical input is present,
syncs on vertical input.
CAUTION
During Tone Sequence mode, entering a scope trigger delay
prevents normal operation of scope triggering.
Controls the posItIOn of the CRT display, when in the
oscilloscope mode.
'--.......-
• Vert
o
Horiz
Vert switch
Vert Vernier control
VertiSinad/Dist
DVM/Counter In
connector
Center (small) control knob Controls the vertical position of the CRT display
Outside (large) control Controls the horizontal position of the CRT display
knob
Four-position rotary switch Oscilloscope operation uses values marked to the right of
the switch, indicating volts per division on the CRT. Modu-
lation display mode uses values marked to the left of the
switch, indicating range for calibrated FM deviation. This
switch also controls Frequency Counter sensitivity.
Potentiometer Vernier gain control for vertical inputs to the CRT when in
the oscilloscope mode. Calibrated position is fully
clockwise.
BNC connector Signal input to the equipment for the following operations
(one megohm input impedance):
1. External vertical for oscilloscope operation
2. SINAD/Distortion Meter
3. Digital Voltmeter
4. Frequency Counter
2-8
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