Maintenance
—
DM 5010
Nonlinearity in
the 20
MΩ range is caused by a lowering
of
the insulation resistance between High and Low, High
and
Ω Out, and
Low, and chassis ground. Check the compo
nents
between these signal lines to find the fault.
Signal
ADC Board
1
RMS
Board
3
High
P1713-4A
P1711-4A
Low
P1713-2A
P1711-2A
ΩOut
P1713-8B
P1711-8A
10. GPIB, CPU
Board, Diagram 9
GPIB
circuit faults
may appear
in four places:
GPIB IC U1105
Data buffer U1100
Control
buffer U1110
Circuit
board
tions.
Place the CPU board on an extender board plugged
into
the
DM 5010 and apply power via a flexible extender
cable
to
the
power
module.
a.
Check that
the data on both
sides of data buffer
U1100 are the same.
b. Check that
the control lines are the same on both
sides
of
control buffer U1110. Check that
the lines are in a
valid state.
c.
To check
U1100, remove U1105, using proper static
handling procedures;
then force U1100-1 (TE) high or low.
Force the data
buffer
inputs (U1100-12 to 19) high
and low.
checking
its
outputs (pins 2 to 9). A similar procedure can be
used
on
U1110.
d. If U1100 and U1110 are not faulty, change U1105.
Visually
inspect
the circuit
board
paths and solder con
nections
in the GPIB circuit for damage and
poor connec
Table
7-15
Signature Versions
Assembly
ROM
1.0
A14,
CPU
670-6815-00
U1200
160-1329-00
|
U1300
160-1328-00
U1305
160-1327-00
U1400
160-1326-00
A15,
Isolation
670-6814-00
A16, RMS
670-6816-00
A17,
ADC
670-6817-00
ADD
JAN 1982
7-19
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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