Maintenance
—DM 5010
Table 7-8
ATTENUATOR FAULTS
Symptom
Diagram
Components
Voltage *
applied
input
(any range)
1
R1637
* applied input in 200 mV through
20 V ranges. Checks good
in 200 and 1000 V
ranges
1,2
R1521,
K1527, and its drive circuit, Function and
Range
Register
(U1500-12) output
Voltage # applied input in 200 or 1000 V
ranges.
Checks good in 200 mV-20 V ranges
1,2
R1429, K1525, and K1425, and their drive circuits.
Function
and Range Register (U1500-5, 7) outputs
Voltage
> one-half the applied input in 200 mV
through
20 V ranges
1,2
K1425 and its drive circuit, Function and Range
Register
(U1500-7) output
Voltage > applied input
in 200 and 1000
V
ranges
1,2
K1527
and its drive circuit, Function and Range
Register, (U1500-12)
output
waveform
matches that shown in Fig. 7-10. If it does not,
check
U1210,
R1101, R1102,
Q1105, Q1106, Q1112,
Q1114 (diagram
1), and their gate drive circuits (diagram 2);
also check
the output of the Function and
Range
Register
(U1300-5,
4,
7,
6, on diagram 2). See Tables 10-2 and 10-5
in the pullout pages.
Connect
the oscilloscope
between
U1110-2 and the iso
lated ground. Set the oscilloscope to 100
mV/cm and
apply
100 mV
to the DM5010 input. Check that
displayed
waveform matches
that shown
in Fig. 7-10. If it does not,
check
the
components listed
in Table 7-9 for the indicated
symptoms.
Table
7-9
DCV
SIGNAL
CONDITIONER FAULTS
Symptom
Components
<$>
U1
110-2
at the
+ or — rail
U1110, U1210,
Q1101,
Q1111, Q1017, and
Q1021
U1
110-2
oscillating
C1017,
C1019
DM
5010
display is
correct
but varies
at
least ± 3 least
significant
digits
U1210
Charge-Balancing
Converter
Connect the
oscilloscope between the input end of
R1229
and
the
isolated ground. Set the oscilloscope to
1
V/cm and 50 ms/cm and apply 100 mV to the DM 5010
input.
If
the displayed waveform does not
match that
in Fig.
7-10,
check R1121, CR1123, CR1125, VR1124, VR1126.
and U1120.
Compare
the DM
5010 display to
the symptoms
listed in
Table
7-10 and check the indicated components
on diagram
1.
Table
7-10
CHARGE-BALANCING CONVERTER FAULTS
Symptom
Components
Display indicates
311
error code when
a
500 V or greater
transient is applied
to the
DM
5010 input
CR1123,
CR1125,
VR1124, and
VR1126
Display
indicates
311
error code when
the DM 5010 is
in a fixed
range and the
applied
input
is more negative
than the
negative full scale
value
CR1129,
VR1129
8.
RMS CONVERTER,
RMS
Board, Diagram 3
a.
To check the first stage of the converter, apply a sig
nal that reflects the problem
to the DM 5010
input connec
tors.
Be
sure the DM 5010 is set to the ACV or
ACV
+
DCV
mode, and to the appropriate
range (or autorange). Connect
a digital multimeter to TP1701 (low) and TP1503
(high).
Check
that
the nominal
ac
voltage measured is as listed
below
for the DM 5010 range:
DM
5010 Range Nominal
Ac
Voltage
200 mV or
2 V same as applied input
20 V
0.1
times the applied input
200 or
700 V 0.001
times applied input
ADD
JAN 1982
7-15
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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