GENERAL RADIO COMPANY 1608-A Operating Instructions Manual page 7

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TABLE 1-1
TABLE OF CONTROLS AND CONNECTORS
CONTROLS
Fig.
1- 1 Ref Name
Type
Function
1
Function 5-pos rotary switch
Turn instrument on or off,
selects internal or external
ac or de operation.
2 BRIDGE SELECTOR 6-pos rotary switch Selects appropriate bridge
circuit for measurement of
C s ' C
p ,
G
p ,
R s ' L s ' and L
p .
3
FULL SCALE RANGE 7-pos rotary switch Selects measurement range,
indicates full-scale value
of CGRL indicator.
4 CGRL coaxial rotary controls Main balance control. Small
knob controls two right-hand
digits of indicator, large knob
controls three left-hand digits.
5 DQ
Continuous rotary control
DQ balance control, used for
C and L measurements
6 12-pos rotary switch Q balance controls, used in G
7
Q 11-pos rotary sWItch and R measurements.
8 Continuous rotary control
9 GEN LEV Continuous rotary control Controls output level of internal
generator,ac and dc.
10 DET SENS Continuous rotary control Controls sensitivity of internal
detector,ac and dc.
CONNECTORS
Fig
1-1 Ref
Name Type
Function
11 EXT GEN
Jack-top binding-post Connection to external gen-
pair erator, ac and dc.
12 DET OUT Jack-top binding-post Output connection from in-
pair
ternal detector. ac only.
13 UNKNOWN Jack-top binding-post Connection to unknown
pair component.
14 EXTDQ Jack-top binding-post Connection to external re-
pair sistance or capacitance to
extend DQ ranges.
15 BIAS Jack-top binding-post Connection to external
pair bias supply.
16 Power Three-terminal recessed Power input connector
male connector
17
3RD WIRE GROUND
Jack-top binding-post
Connection to ground wire
pair of three-wire power line.
18
EXT METER CON- Three jack-top binding Connection to external dc null
NECTIONS posts indicator.
J
2