Ac Voltage Test - Fluke II Series Service Manual

Maintenance
PERFORMANCE
TESTS
1.
Set the
UUT
function switch
to
VDC,
and connect
the
DC
Voltage
Calibrator output
to
the
vn-*+-
and
COM
input terminals of
the
UUT.
2.
Referring
to
Table
3-2, set the
DC
Voltage
Calibrator for the output indicated
in
steps
1
through 4
only.
Verify
that the
UUT
display reading
is
within the
limits
shown.
Table
3-2.
DC
Voltage Test
STEP
DC
INPUT
DISPLAY READING
VOLTAGE
70
73/75/21 77/23
1
2.685
to
2.715 2.688
to
2.712
2.691
to
2.709
V
DC
2
26.85
to
27.15 26.88
to
27.12
26.91
to
27.09
V
DC
3
+270V
268.5
to
271.5
268.8 to 271.2 269.1
to
270.9
V
DC
4 +1000V
993
to
1007 995
to
1005 995
to
1005
V
DC
*5
+300
mV
298.4
to
301.6 298.7
to
301.3 299.0
to
301.0
V
DC
*300
mV
function only
3.
Set the
DC
Voltage
Calibrator for an output of
+300
mV,
and switch
the
UUT
to
the
300
mV
function. Verify
that
the
UUT
display reading
is
within the limits
shown
in
Table
3-2
(step
5).
AC
Voltage Test 3-9.
WARNING
CONNECT
THE GROUND/COMMON/LOW
SIDE
OF THE AC
CAL-
IBRATOR TO
COM
ON THE
UUT.
1.
Set the
UUT
function switch
to
VAC,
and connect
the
AC
Voltage
Calibrator
to the
vn-++ and
COM
input terminals.
2.
Set the
AC
Voltage
Calibrator for the
output given
in
Table
3-3,
and
verify
that
the
UUT
display reading
is
within the limits
shown.
NOTE
When
the input
is
open
in
the
VAC
function,
it
is
normal
for the
70
Series
II
meters
to
read some
counts
on
the display. This
is
due
to
ac pickup
in
the
ac
amplifier
when
the
ac
amplifier
is
unterminated.
Table
3-3.
AC
Voltage Test
INPUT
DISPLAY
READING
70, 73, 75/21
and
77/23 STEP VOLTAGE
FREQ.
1
2.7V 100
Hz
2.644
to
2.756
V
AC
2
2.7V
500 Hz
2.644
to
2.756
V
AC
3 750V
100
Hz
733
to
767
V
AC
4 750
V
1000 Hz 733
to
767
V
AC
3-7