A&D AS2503, Instruction Manual

Page: 61 / 90

４－１５
The formula is as follows:
Calibration value of physical amount = x Rated capacity
The physical amount can be calculated as follows:
Calibration value of physical amount: 250 kg (500

m/m
）
Deflection of CAL waveform: 10 mm
Deflection at point
Ｂ
: 22 mm
The physical amount can be calculated as follows:
Load at point
Ｂ
= x 250 kg = 550 kg
4.4.1 Correction of Calibration (CAL) Values
(1) Where gauge factors are not 2.00
In this amplifier unit, its gauge factor is set to 2.00. If strain gauges with a gauge factor other
than 2.00 are to be used, the following formula must be used.
True CAL value = x CAL value of unit
(2) Where bridge configurations are not quarter-bridge configuration
The calibration (CAL) values of this amplifier unit are equivalent voltage values based on the
2.00 gauge factor and the quarter-bridge configuration. The calibration values based on half- or
full-bridge configurations can thus be obtained by referring to the next table.
The relationship between the bridge supply voltage and bridge output voltage can be
represented by the following formula:
ｅ
= (K x

x
Ｅ
x Bridge configuration)/4
Where:
Ｋ
; gauge factor

; Amount of strain (10

m/m)
Ｅ
; bridge voltage
Gauge configuration Real calibration value
Two-gauge
One active one dummy Calibration value on panel ×
１
Two active Calibration value on panel ×1/2
Opposite arm two active Calibration value on panel ×1/2
Four-gauge Four active Calibration value on panel ×1/4
Transducer Four active Calibration value on panel ×
１
(*)
Table 4-9
Calibration value for 10
-6
strain of the amplifier
Rated output value (10
-6
strain)
2.00
Kc (Gauge factor of strain gauge)
22
10