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Section III
Model 651B
(T)
FREQUENCY Dial: Varies output frequency
within each frequency range.
Dial reading
multiplied by range setting is the output fre¬
quency of the instrument.
(T) FREQUENCY RANGE Switch (SI): Selects
one of six frequency ranges, from 10 Hz to
1 MHz.
Output Monitor (Ml): Monitors the amplitude
of the test oscillator output.
Mechanical Zero Adjust: Allows output moni¬
tor to be mechanically zeroed, when instru¬
ment is off.
(T) OUTPUT ATTENUATOR: Attenuates test os¬
cillator output in nine steps of 10 dB each.
Output Connectors (J2 and J3): Provides the
output signal, at impedance levels of 50fi and
600a
(75S2 and 600^ on Opt. 02).
(T) AMPLITUDE COARSE and FINE Controls:
Controls amplitude of signal applied to OUT¬
PUT ATTENUATOR.
FREQUENCY VERNIER: Provides a fine
frequency adjustment for FREQUENCY dial.
(?) LINE ON Switch (S3) and Pilot Lamp: Switch
applies primary power to instrument; pilot
lamp glows to indicate application of primary
power.
115/230 V Slide Switch (S4): Sets instrument
to operate from a primary power source of
either 115 Vac or 230 Vac.
FUSE (FI): 0,4 amp fuse protects instrument
from overloads.
Primary Power Connector (Jl): Connects
primary power to test oscillator.
Figure 3-1.
Location of Controls and Indicators
3-0
01810-1
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