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Section III
Model 654A
o
re
654A TEST OSCILLATOR
NE TTTTT • INICII•RD
N
ON
12
13
IN
14
16
—FREQUENCY
RANGE
15
e
Ell(
RICO
RIO
VERNIER
SIN
—
AMPLITUDE
IMPEDANCE
0
-) ._„
OUT
IT LEVEL de.
•-/
UN41.
11
10
o
5/
0 .100•0/
115/2300010% •••••
3000 NY
I
I
COUNTER OUTPUT
o
o
FREQUENCY
dial (C1A/B/C):
Varies
test
frequency continuously within each frequency
range. Dial reading multiplied by range setting
gives the output frequency in Hz of the 654A.
FREQUENCY RANGE switch ( S2): Selects one of
six frequency multipliers from X10 to X1M.
Output Meter (M1): Monitors amplitude of 654A
output prior to OUTPUT LEVEL attenuators.
Algebraic sum of meter indication and OUTPUT
LEVEL attenuator setting gives output power into
rated load.
Mechanical Zero Adjust: Allows meter to be
mechanically zeroed, when instrument is off.
OUTPUT LEVEL (S4): Attenuates 654A output
signal in nine steps of 1 dBm each.
OUTPUT LEVEL (S4): Attenuates 654A output
signal in nine steps of 10 dBm each.
UNBAL output (J4): BNC connector provides an
unbalanced output signal, at impedances of 50
ohms and 75 ohms.
BAL output (J3 and J4): BNC connectors provide
a balanced output signal at impedances of 135
ohms, 150 ohms and 600 ohms.
IMPEDANCE switch (A4S1):
Selects required
output impedance of instrument; pushbuttons are
interlocked so that when one is pressed the others
spring out.
AMPLITUDE control ( R3): Allows adjustment of
+/-1 dBm of output signal amplitude.
FREQUENCY
VERNIER:
Provides
a fine
frequency adjustment for FREQUENCY dial.
LINE ON switch ( Si) and Pilot Lamp (DSO:
Switch applies primary power to instrument; pilot
lamp glows to indicate application of primary
power.
115 V or 230 V Slide Switch (S3): Sets instrument
to operate from a primary power source of either
115 Vac or 230 Vac, 48 Hz to 440 Hz.
FUSE (F1): 0.4 amp slow blow fuse protects
instrument from overloads.
COUNTER
OUTPUT (J2):
BNC
connector
provides signal output of greater than 0.1 V rms
into a 50 ohm load, at same frequency as front
panel outputs.
Primary Power Connector (J1): Connects primary
power to instrument.
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