21
szzzzzz
represents the zero reading for the transducer being read,
sffffff
represents the multiplier
(calibration or gage factor) that will be applied to the reading to convert to engineering units and
soooooo
is the offset that will be applied to the gage reading. The zero reading, gage factor and
offset can be entered with a sign and decimal point. The maximum number of digits, including
sign and decimal point is 15. The entered value will display to a maximum of five places to the
right of the decimal point.
For all vibrating wire instruments (Gage Types 1-6), manufactured after November 2, 2011 and
for all dataloggers (8002-4-X) with a firmware revision of 3.1.X and up, the basic formula for
calculation of displayed and stored values is as follows:
Display
=
((CurrentReading - ZeroReading)
×
Multiplier) + Offset
Equation 1 - Displayed Gage Reading using Linear Conversion
NOTE: In Equation 1 (above), the “
CurrentReading
” is frequently referred to as
R
1
while the
“
ZeroReading
” is referred to as
R
0
Polynomial Conversion:
G
nn/c/tt/saaaaaa/sbbbbbb/scccccc
Where:
nn = Channel # (Valid entries are 1, 2, 3, and 4 for the LC-2x4)
c = Conversion Type(L/P)
t = Gage Type:
0: Channel Disabled (will display “---“)
1: VW Gage Type 1
2: VW Gage Type 2
3: VW Gage Type 3
4: VW Gage Type 4
5: VW Gage Type 5
6: VW Gage Type 6
saaaaaa = polynomial coefficient A with sign
sbbbbbb = polynomial coefficient B with sign
scccccc = polynomial coefficient C with sign
When using polynomial conversion (P), the G command is used to select the gage type and enter
the three polynomial coefficients, A, B and C.
Polynomial Conversion is described further as follows:
NOTE:
It is possible that a new datalogger might be used with an older sensor or vice versa and because of
equation differences the output might be negative. As of LogView version V2.1.1.X, an additional sensor
configuration parameter is now required, allowing LogView to compensate for old versus new
sensor/datalogger combinations. This new parameter:
Output Calculation
, determines whether the sensor
was calibrated using the formula:
G x (R
0
– R
1
)
or
G x (R
1
– R
0
).
As with the gage factor, this information is
available from the calibration certificate supplied with each sensor. Please see the LogView User’s Guide or
the online help section, “Sensor Settings” available while running LogView.