Front And Rear Panel Description - HP 333A Operating And Service Manual

Section TII Model
333A/334A
@LINE switch turns instrument ac power on.
Pilot lamp glows when instrument is turned ON.
@Meter indicates distortion or voltage level of
input.
@MODE switch selects MAIUUAL
or
AUTOMATIC
bridge tuning operation.
@FREQUENCY RANGE switch selects frequency
range which corresponds
to
fundamental of input
@COARSE BALANCE control provides coarse ad-
justment for balancing the Wien bridge circuit.
6 FINE BALANCE control provides a vernier ad-
'justment for balancing the Wien bridge circuit.
7 Frequency
dial tunes the Wien bridge circuit to
'fundamental of input signal.
@HJGH PASS FILTER switch inserts or bypasses
HIGH PASS FILTER
i n
SET LEVEL and D I S -
TORTION function. When inserted, filter pro-
vides > 40 dB attenuation
to
50
-
60 Hz hum
components but no attenuation to frequencies
over 1 kHz.
@OUTPUT connectors provide means of monitor-
ing output of meter circuit.
@Frequency vernier provides fine adjustment of
frequency dial.
@METER RANGE switch selects full scale range
of meter
in
percent, dB and r m s volts.
S i g n a l .
O S E N S I T M T Y selector provides
r)
-
50 dB atteau-
@SENSITIVITY VERNIER control provides fine
@Mechanical zero adjust provides mechanical
OFUNCTION switch selects type of operation of
@Shorting bar connects circuit ground to chassis
@INPUT terminals provide connections for input
ation of input signal in 10 dB steps in SET LEVEL
and DISTORTION functions.
adjustment of sensitivity setting.
zero adjustment of meter.
instrument.
ground.
stgnal.
@RF INPUT connector (Model 334A only) provides
input connection for
AM
RF carrier input signal.
20 FUSE provides current overload protection for
0
instrument circuits.
21 Line voltage switch sets inrrtrument to
'operate from 100 V/120 V/220 V/240 V.
@ )
Ac power connector provides input connectton
for ac power.
~~~
Figure 3-1. Front and Rear Panel Description
3- 0