GENERAL RADIO COMPANY 1650-B Instruction Manual page 5

Impendance bridge
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BIAS jack.
Voltage bias for capacitors: Apply biasonly if PARAMETER switch is in
Cs position. For Cp,.refer to Section 2. Max voltage is 600V dc. Add a
resistor as a current l ~ m ~ t e r
to prevent short circuit.
Current bias for inductors: Apply bias only if PARAMETER switch is in
GENERATOR switch.
Lp position. For L , ,
refer to Section 2.
Turns bridge on, selects internal or external
\
/
generator, ac or dc, checks battery.
\
Internal OSCillator LEVEL control.
/
UNKNOWN terminals.
PARAMETER switch.
OPP ARM jack.
Connect external
decade capacitor
for reactive bal-
ance of resistors.
external amplifier
or earphones for
additional sensiti-
Ground.
- / . d
MULTIPLIER switch.
-
Multiply CGRL dial setting by
switch range for result.
'
DETector SENSitivity control.
accuracy, choose MULTIPLIER
ting for balance between 1 and
set-
10.
vity or selectivity.
DO dial.
OR THO NULL^
switch.
When set to IN, clutch engaged between
/
EXTernal DO jack.
Useful for extending DO range with
a decade box.
EXTernal GENerator jack.
Max power: 0.05 W .
Max voltage: 500 V dc; or f- V ac rms where f is in Hz, or 100 V ac rms,
5
two main dials, false nulls are avoided and
balance is faster for high D and low Q
measurements. Switch to I N when CGR L
and DO dials are both in white sectors.
-
whichever is smaller.
Frequency range for L and C: 20 Hz to 20 kHz.
Figure
1
-
1.
Type 1650-B Impedance Bridge.

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