DayTronic System 10, User Manual Book

Page: 399 / 414

C
ONFIGURATION AND
C
ALIBRATION
OF
A
NALOG
I
NPUT
C
HANNELS
1.G
4C and 10A78), when the manufacturer-supplied transducer sensitivity (in mV/V,
full-scale) is known. This method involves sending appropriate
MILLIVOLT/VOLT
CALIBRATION (MVV) and ZERO (ZRO) commands to the System 10. It is gen-
erally faster, more convenient, and inherently more accurate alternative to “Two-
Point (Deadweight)” calibration of a strain gage input channel—although final
accuracy of calibration will depend, of course, on the accuracy of the transducer
manufacturer’s specifications.
For complete instructions, refer to the subsection of Section 1.E.2 of this Guide-
book that treats the channel’s “source” Strain Gage Conditioner Card (10A70-2,
10A72-2C, 10A73-4, or AA72-2 / AA72-4).
c. O
THER
C
HANNEL
T
YPES
“CALCULATED” CALIBRATION may also be employed with a channel originating
from a Model 10A74-4C Quad Strain Gage Track-Hold Conditioner, Model 10A43
Dwell Angle Conditioner, Model 10A48 Modulated Carrier Flow Conditioner,
Model 10A76 Vibration Conditioner, or Model 10A96 Amplified Accelerometer
Vibration Conditioner Card.
The precise commands sent to the System 10 will vary with the conditioner card
that sources the channel. See the respective subsection of
Section 1.E.2 for
complete instructions.
1.G.5
T
WO
-P
OINT
(D
EADWEIGHT
)
C
ALIBRATION
: ZRO
AND
FRC
This is a conventional “zero and span” technique accomplished by the ZERO
(ZRO) and FORCE (FRC) commands. It may be used for most types of “real”
channel when the application of one or more accurately known transducer loads
is possible. It can even be used with temperature-measuring channels (in place
of standard “Absolute (CPU)” calibration, when it is desirable to force multiple
temperature readings to the same exactly known temperature. The only Condi-
tioner Cards to which it is not normally applicable (in its standard form) are the
Models 10A43, 10A48, 10A74-4C, 10A76, and 10A96.
A TUTORIAL OVERVIEW of this calibration method is given in Section 10 (“Data
Channel Calibration”) of the “On the Air” book for your mainframe type (“A-sized”
or “B-sized”), located in the front of this Guidebook. If you have not already done
so, you should study this section to familiarize yourself with the procedure, which
is given in slightly more detail below.
1. Provide “Live” Channel Data Display
Using the guidelines given in Section 5 of the “On the Air” book, you should
first arrange for a “live” display of the channel to be calibrated.
NOTE: If your System 10 does not have LCD/VFD or CRT video capability,
you can “display” the channel to be calibrated by transmitting its data reading
from the Computer Interface Port to a receiving CRT terminal. You can use
the
STREAM (STR) command for this purpose, along with a special HEADER
or TAILER that allows nonscrolling CRT display of the system’s “datastream”
output (see Sections 1.H.2(d) and 1.H.3 of this Guidebook for details).
1-37 1.G.5 T
WO
-P
OINT
(D
EADWEIGHT
) C
ALIBRATION