Maintenance—
DM 5010
Fig. 7*9.
Over-voltage protection and function switching
waveform.
Fig. 7-10. DCV
Signal Conditioner and Charge-Balancing
Converter
waveform.
If the measured voltage is correct, troubleshoot
the
next
stage, according
to
part 7b.
If incorrect, check the compo
nents
listed
in Table 7-11
for the indicated symptoms.
If no error is
found, check the final stage of the converter
in
part
7c. If
an error is detected, check the components
listed
in Table 7-12 for the DM 5010 symptoms.
Table
7-12
RMS
CONVERTER FAULTS
Table
7-11
RMS
CONVERTER FAULTS
Symptom
Component
Error occurs
in ACV mode but
not
in ACV
+DCV mode
C1621
Error
occurs
in ACV+DCV
mode with
a de or low
fre
quency ac input
K1621,
R1621
Error
occurs
in all ranges
R1603,
R1501, K1621,
U1500, C1605,
C1607,
C1609,
C1503, C1505,
+
and
-12 V supplies
Error occurs in 200 mV,
2 V
ranges
R1501,
C1505, C1503
Error occurs
in 20 V range
R1403,
R1401, C1403,
C1504
Error
occurs in
200, 700 V
ranges
R1309,
C1311
Symptom
Error occurs
in all ranges
Error
occurs
in 200 mV,
200 V ranges
Error occurs in
2 V, 20 V,
700 V
ranges
Component
R1307,
R1201,
U1200,
+
and — 12 V supplies
R1201
R1211,
K1201
c.
To
check the
final converter stage, move the digital
multimeter high
lead to U1100-8 (low lead remains at
TP1701).
Check that the measured de voltage is equal to
the
rms value
of the
applied input, scaled to
a maximum
of
2 V for a full
scale input. If an error is detected, check
U1100,
Cl 101, C1103, C1001, and R1101. if no
error is
found, check Q1217 on the ADC
board (diagram
1). If
Q1217
is
good,
make
sure the A/D Converter is functioning
properly by measuring a
de input in the DCV mode.
If not,
refer to the A/D
Converter and De Voltage Measuring Cir
cuits
troubleshooting information.
b. To
check the second stage of the RMS Converter,
move
the
digital multimeter high
lead to TP1201 (low lead
remains
at TP1701).
Set the applied input voltage to a full
scale
value for the DM 5010
range being checked. Check
that
the nominal ac voltage measured is as listed below for
the
DM
5010
range.
DM 5010 Range
200
mV
—200 V
700 V
Nominal Ac Voltage
2 V
0.7 V
9. OHMS CONVERTER, RMS
Board, Diagram 3
To
troubleshoot the Ohms Converter, place the RMS
board
on an extender board and set the DM 5010 to the
OHMS
mode,
with the
range
(in STEP mode) and input con
dition as
listed
in Table 7-13.
Measure the voltage between
the component
listed
in the table and ohms ground. If the
voltage is outside
the limits
listed,
check the designated
component.
ADD
JAN
1982
7-17
Summary of Contents for DM 5010
Page 14: ...DM 5010 2994 00 DM 5010 Programmable Digital Multimeter xii ADD JUL 1986...
Page 27: ...Operating Instructions DM 5010 2994 03 Fig 2 3 DM 5010 front panel controls and connectors 2 3...
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Page 251: ...Section 8 DM 5010 OPTIONS No options are available 8 1...
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Page 272: ...DM 5010 2994 37 Fig 10 2 Location of DM 5010 adjustments and test points...
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Page 276: ...DM 5010 2994 112 DM 5010 BLOCK DIAGRAM...
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Page 337: ...63 REV JUN 1986...
Page 338: ...FIG 1 EXPLODED DM 5010...
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