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H
52 005-3
OlD
WORKING VOLTAGES
17.
The voltages given (Table 1) are representative of those to be expected on an a, c. operated
instrument if measurements are made with
a
multi-range
meter
having a sensitrvity of 20 kQ./V
using the lowest range suitable for each reading with a supply voltage at the mean of the range
for which the instrument is set.
When checking these voltages, allowance should be made for
permissible
variations
in semiconductor performance and component values which may be found
on an individual instrument.
It
is
assumed that the stabilized
d.
c. supply voltage is correctly
set at 55
V
(para. 19).
TABLE 1
Working voltages
Unit
Transistor
Base (V)
Emitter (V)
Collector (V)
Voltage
datum
Oscillator
VTl
-36
-36
-56
l
VT2
-56
-56
-87
Positive
d.
c.
VT3
-56
-56
-87
supply
line
VT4
-56
-56
-87
VT5
2.6
2
17
VT6
2.2
2
29
VT7
35
33.5
55
VT8
29.2
28.8
55
Negative
d.c.
VT9
28.6
28
55
supply line
VT10
28
27.5
53.2
VTll
2.4
1.9
26.7
,J
Voltmeter
VT1
-4.5
-4.55
-8
Positi\·e d. c.
VT2
-4.55
-4.3
-8
supply
line
PRESETS
-OSCILLATOR
18.
Although
small adjustments can be made
to
any of
the presets
RVl and RV3 to RV5
a
lone,
it is
preferable to
check and, if necessary, adjust
them
all
in
the order
RV1, RV4
,
RV3
and
RV5.
Resistor RVl
19.
This control
determines the voltage of the stabilized
d.
c
.
supply feeding the amplifier.
Chap.
5
Page 4
N
ov
.
79
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