NOTE: When an optional Model 10CJB-2 Bridge Completion Card is
used with the 4077, see Appendix F, below, for special calibration
considerations.
1. "Computed" Calibration: MVV
This is generally a faster, more convenient, and inherently more
accurate alternative to either "TWO-POINT (DEADWEIGHT)" or
"SIMULATED (SHUNT)" CALIBRATION—though final accuracy of
calibration will depend, of course, on the accuracy of the transdu-
cer manufacturer's specifications.
To calibrate the 4077's ANALOG INPUT CHANNEL (No.1),
a. Command
MVV 1 = i, u [CR]
For "i," enter the manufacturer-supplied
transducer sensitivity
rating
in "mV/V, full scale." For "u," enter the transducer's
nominal full-scale rating
in whatever engineering units are
desired. (PLEASE NOTE: In the answer returned in response
to an MVV x [CR] interrogation, the displayed "i" and "u"
values will have been automatically
rescaled
to reflect the
current "mV/V range" setting (see Appendix D, above). Thus,
for example, if the "3 mV/V" range is in effect and the com-
mand MVV 1 = 2.500, 5000 [CR] has been entered, an
answer of "3.000, 6000" will be given to a subsequent query
of MVV 1 [CR] (since 3.000/2.500 = 6000/ 5000)).
b. Then "zero" the channel by commanding
ZRO 1 = 0 [CR]
A channel calibrated by the MVV and ZRO commands will
report measurement data to a precision matching that of the
entered "u" value. If, for example, you're measuring "psi," and
enter a "u" of "500," then all subsequent channel readings will
be rounded to the nearest psi. If the entry is "500.0," then all
readings will be rounded to the nearest
tenth
of a psi.
E.1
App. E "Computed" and "Simulated" Calibration
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