Theory
of
Operation—
DM 5010
B.
MEASUREMENT,
OVERRIDE,
AND AUTO-ZERO PERIODS.
2994-U
Fig. 4-6. U/D control for the measurement, override, and auto-zero periods.
age.
It is stored on C1139 by opening
the switch associated
with R1227
at the
end of the Auto-Zero period. The Integra
tor
output
is disconnected from the Auto-Zero Buffer and
the
zero-reference voltage is
buffered to the Comparator.
Measurement
The Measurement
period, like the Auto-Zero period, is
based
on
timing signals developed by the Timing Logic.
After the Auto-Zero
period is complete, the Measurement
period
begins with TO of the next measurement interval. As
shown
in Figs. 4-6 and 4-8, the Integrator's output always
charges
positive during TO and negative during T17. The
charge direction for
the entire T1 -T16 period
depends on the
polarity of the Comparators output at the end of time
TO.
As the
measurement begins, the input current l
OT is
switched into
the summing node along with the negative
reference
current l
re/ou(. After a short time, the comparators
output ICOMP
(isolated
comparator) goes high, indicating
that
the Integrator output is more positive than the zero
reference voltage set during
Auto-Zero. At
the next
TO, the
control
Logic sets
the I U/D
(isolated up-down) low to
4-10
ADD
JAN
1982
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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