Model 6960 A
Section
V
an ohmmeter,
e.g.
iFiJ
Model
412A,
to make
certoin
the
negative
output
terminal,
the
pasitive
output
terminal,
and
the
collectors
of
Q 1 and Q 2
are
nat
grounded.
Now switch the Model 6960A
on.
Vary
the
output
voltage
in both
voltage
ranges
with the VOLTAGE ADJUST to be sure
that
the
voltage
control
is
operative.
a) Meter Zero
Set.
When the instrument
is
at
normal
operating
temperature
and
then
switched
off,
the meter pointers must rest on
the
zero
calibration
mark
af
the
meter
scale.
If
they
are
outside
the
zero
mark,
adjust
the
them as
follaws:
After turning off the instrument
wait
two minutes for
power
supply
capacitors
to discharge
completely.
Rotate adjustment
screw below
the
meter
scale
clockwise
until
the
meter
pointer
is
to the left
of
zero
and
farther
clockwise
rotation
will move
the
pointer
upscale
towards
zero.
Turn
the
adjustment screw
clockwise
until
the
pointer
is
exactly
over
the
zero
mark on
the
scale.
If
the
screw is turned too far
repeat
the
procedure.
Turn meter adjustment screw
sl
ightly
counterclockwise
ta
break
contact
between adjustment screw
and
pointer
mounting
yake,
but not far enough to move
the
pointer
downscale.
If
screw
is
turned
tao
far, as shown
by
needle
movement,
repeat
the
procedure.
b)
Volt Meter and Ammeter
Calibration.
Set the
output
to
exactly
36 V
controlled
by
an
external
dc
valtmeter
which
has
better
than 1 % full
scale
errar,
i.g.
iFiJ
Model
412A.
Adjust
the
built-
in
valtmeter
to
exactly
36 V
by
means
of
variable
resistor R
20.
Switch
the
Model 6960A under test into
the
18
V-0.6
A
range
and
bring
the
output
current
to
exactly
600 mA,
controlled
by
an
external
dc ammeter like
the
~~
Model
412A.
Adjust
variable
resistor R
21
so
the
front panel ammeter
reads
exactly
600 mA.
c) Maximum Short
Circuit
Current.
The
short
circuit
current
can be measured
either
by measuring
the
voltage
drop acrass a 1
()
precision resistor
between
the
autput
terminals
or
by
switching
aff
the
instrument and
connecting
the
current
leads
of
the
ma-
del 412A across the
autput
terminals
and
turning
an
the
Model
6960A.
The
CURRENT
LIMIT
canrrol must be
set
fully
clackwise.
The
maxium rating
of
shart
circuit
current
shauld be 360
mA
ar
720
mA
respectively;
the
minimum ratings
are
330
mA
or
660
mAo
The naminal
and
factary
adjusted
values
are
340
mA
and
680
mAo
These ratings should be
adjusted as follaws, if
the
shart
circuit
current
turns
aut
ta
be too high
ar
taa
law.
5-6
,';.,'-,-
;.,';;;
;;;.;.:
•••
; ••
;;;
••
;.;.;.;;;;;;;
••
;;.;;:.;;;;;;;;;:;;;;;;:;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;:;;;;;;;;;:;;;:;;;:::;::;;:;:::::::::::::;;;Hi
To Next Page
Loading...
