A&D AS2503, Инструкция по эксплуатации

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４－１４
Measured value at point B={ } x Set CAL value
(1) Measurement with strain gauges
Set CAL value: 500

m/m
Deflection of CAL waveform: 10 mm
Deflection at point B: 22 mm
Amount of strain at point B =
｛
22/10
｝
x 500

m/m
=1100 x

m/m
Where the measurement is based on the quarter-bridge configuration with a gauge factor
of 2.00.
(2) Measurement with various types of transducers
This calibration voltage value is linked with the bridge supply voltage, and the amount of
calibration can always be applied with any panel-indicated value (1

m/m to 9,999

m/m).
Example:
If a load cell with a rated capacity and a rated output of 1 ton and
１
mV/V is used, to
convert the rated output of
１
mV/V into an amount of strain, the rated output is given by:
1
ｍＶ
/
Ｖ
x 2
Ｖ
= 2m
Ｖ
Where the load cell is used with the bridge voltage (E) = 2V.
If the measurement is based on the quarter-bridge configuration with a gate factor (K) of
2.00, the relationship between the amount of strain (

) to be applied to the bridge and the
output voltage (e) is given by:
e = 1/4 x
Ｋ
x
Ｅ
x

= 1/4 x 2 x 2 x

=

That is, 1

m/m strain corresponds to 1

V and 1000

m/m to 1 mV. The rated output of 2 mV
corresponds to 2000

m/m. As a result, the relationship between calibration values and the
physical amount is as follows irrespective of the bridge supply voltage:
Strain calibration value Physical value calibration value
2000×10
ｰ
6
strain 1ton× 1 =1ton
1000×10
ｰ
6
strain 1ton×1/2 =500
㎏
500×10
ｰ 6
strain 1ton×1/4 =250
㎏
200×10
ｰ 6
strain 1ton×1/10 =100
㎏
Table 4-8
b (Amplitude at point B)
a (Amplitude of calibration value)