Advertisement
IX.
X.
B.
CH
1.
2
Rotate
the
VARIABLE
fully
CCW
and
check
for
2.5:1
attenuation.
(no more
than
1.6 cm of deflection).
Return
the
VARIABLE
to
the
CALIBRATED
position
(fully
CW).
Repeat
the
steps
outlined
in A for
CH
2.
GRID
CURRENT
AND
MICROPHONICS
I.
A.
CH
B.
CH
ADD
2
Set
the
INPUT
COUPLING
from
DC
to
GND
and
check
for
1 mm or
less
of trace
shift
(5 nanoamps
of grid
current).
With
the
input
grounded,
rap
lightly
on
side
of
scope
and
check
for
less
than
2 mm
of
microphonics.
Repeat
the
steps
outlined
in A for
CH
1.
A.
ADDED
ALGEBRAICALLY
I.
Set
the
MODE
sw
to ADD,
both
INPUT
COUPLINGS
TO AC,
and
apply
.lv
from
the
calibrator
to
both
input
connectors.
Check
for
4
cm
of
deflection
within
+.8
mm.
'a.
Only the CH 1 POSITION control should operate in
the
ADD
mode.
B.
LOW
FREQUENCY
COMMON
MODE
REJECTION
1.
Pull
out
the
CH
1 PULL
TO
INVERT
sw and
apply
.5v
from
the
calibrator.
Check
for
less
than
.5 cm
of
deflection.
Push
in
the
CH
1 PULL
TO
INVERT
sw and
pull
out
the
CH
2 PULL
TO
INVERT
sw.
. Check
for
less
than
.5 cm
of
deflection.
a.
With
both
INPUT
G@UPLINGS
set
to AC,
20:1
rejection
of a signal
of 20 X the VOLTS/CM
setting
(lv)
is
obtaineo
with
most
of
the
early
phase
C
instruments.
Advertisement
Need help?
Do you have a question about the 1A2 and is the answer not in the manual?