Model 8640B TM 9-4935-601-14-7&P
FRONT PANEL FEATURES
20 MODULATION: vernier varies amplitude
modulation from 0 to 100% (as indicated on the
meter).
21 AUDIO OUTPUT LEVEL: control varies level of
signal from AM and/or FM OUTPUT jacks
(calibration gives voltage into 600Ω).
22 LINE: switch applies or removes AC power. The
button is lit when ON.
23 AM: selects amplitude modulation and source.
OFF: no AM.
INT: AM by internal oscillator.
AC: AM by external source through AM INPUT
jack (>20 Hz, ac + dc <5 Vpk).
DC: AM by external source through AM INPUT
jack (ac + dc <5 Vpk).
PULSE: when selected with no modulation, it
disables the RF output; a positive pulse at AM
INPUT pulses on the RF.
24 Mechanical Meter Zero: sets meter suspension so
that meter indicates zero when power is removed
from instrument and instrument is in normal
operating position.
Figure 3-2. Front Panel Controls, Indicators, and Connectors (4 of 4)
3-5
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