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18
-
Check that the
output amplitude
is
4 V
p
_
p.
-
Set SK3 to position "'.
- Check the calibration of
attenuator
R2
at
a frequency of 1 kHz.
- Check the
amp litude
respo
nse of the
output signa
l
at
10,
30
and
JOO Hz
(SK2
in
positi
on
X
l)
and
at JO, 30
and
JOO kHz
(SK2
in position
X
lK). Tolerance:
::;
1%
of the output
amplitude
at 1
kHz.
E. SQUARE WAVE VOLTAGE
- Set SK3 to position
'L
.
- Check
that the
mark/
space
ratio
at 2
kHz
is 1:
l
(see
Fig.
4).
If
necessary, adjust
with R20.
-
Set attenuator R2 to position
2.0
V.
-
Check
that the
output vo ltage
is
4 V
p _
±
5%
.
p
- Check
that the
sag at 50
Hz
and
4 V
p _
is
::;
10
mY.
p
z
x : y
=
mark/space ratio
z
=
sag
PEM 1515
E
1
320
Fig
.
4.
Square wave
vo/tage shape
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