1 .
DESCRIPTION
This
Manual
is
for use
in
conjunction with
the
Valve
Chart
published
separately.
1/1
GENERAL
The
Model
45C
Valve Tester
caters for
practically
every known
type
of electronic
valve except
the
larger
transmitting types.
Any
normal
fault can be
quickly
detected
and
the
general
condition
of a valve
is
precisely
measured
by
the Mutual
Conductance Test.
The
instrument is
self-contained
and A.C.
operated.
1
/
2
MAINS ADJUSTMENT
A
3
-pin plug
should be fitted
to
suit the
sockets
available.
Red
—
Line
Black
—
Neutral
Green
—
Earth
If a
2
-pin
plug is used
the green wire is preferably
connected
to a separate
earth.
The
instrument
is
designed to operate
from
supplies of
105-125
or
200-250
volts
40-100
cycles. The
voltage
adjustment
panel
will be
found on the left
hand
side of
the
instrument; the bakelite-hecded
plug
should
be
plugged firmly
into
the
socket
most
nearly
corresponding to the actual voltage, i.e.:
—
For
105-125
volts use
the
115V. socket
„
200-224
,,
•
,, fl
210V.
„
,,
225-250
240V.
„
The consumption
is approximately 30 watts
.
1
/3
CONTROLS
The Main Selector
at top
right-hand side
of panel enables
the required
type of test
to
be
selected.
Below this is the Grid Volts control, calibrated
in volts
0-15.
Op the left-hand
side
are the
selectors for Anode and Screen voltages,
and for
filament
voltage
.
Below
the
meter are
the ABC selectors
by
means
of which the
correct pin
connections
are
made.
The right-hand
push button and the knobs
marked
A
and
B
are used on Mutual Con-
ductance Tests.
Tests for
Gas are
made with the left-hand
push button.
The fuse
(mains circuit) is
fitted inside
the
instrument immediately
above
the
mains
adjust panel. The
mains
ON/OFF
switch
is
at the
front of the
instrument.
1
/4
METER
SCALES
The
outer scale
is
calibrated direct in mA/V,
the two
sets of figures referring to
the
two ranges
available
on
the Main Selector.
The
arc marked
“
Replace—
?
—Good
”
is used
on
Rectifier
and Diode Tests only.
3
To Next Page
Loading...