Fluke 415B - Page 53

415B
c.
Set the
POWER
and HIGH
VOLTAGE
switches to
ON.
Set the
500
volt
OUTPUT VOLTAGE
dial to
each
setting
and
measure the
rectifier output.
(Differential
voltmeter
indications are via the
ten-
to-one divider).
DIAL POSITION
VOLTS
DC
(±10%)
0
500
1000
1500
2500
1700
2300
2700
3500
4800
4-50.
DC OUTPUT
RIPPLE. This
procedure
meas-
ures
and displays
the ac ripple
superimposed
on the
dc
output.
a. Set
the controls
of the
Model 41
5B
as
follows:
POWER
POLARITY
OUTPUT
VOLTAGE
dials
OFF
Negative
First
dial to
2500;
second dial
to
500;
others to zero
b. Connect
a 0. 05
microfarad,
5000 volt,
capacitor
and
the protection
circuit shown in
Figure
4-2
in
series
between the OUTPUT
connector
and the
input
of a
preamplifier
(Gain
=
100). Connect
the
pre-
amplifier
output to
the input
of
an
oscilloscope.
c. Set the
POWER
and HIGH VOLTAGE
switches
to
ON
and observe
the ripple. The ripple
should
be
less than 1.0
millivolt
peak-to-peak
(see
Figure
4-5).
(Oscilloscope
display
should indicate
less
than 100
millivolts
peak-to-peak, and are
typically
20 to 40 millivolts
peak-to-peak).
4-8
Rev. 1