B&B Electronics 4 Channel Input Buffer Board SDAIBB User Manual
Page 21
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B-2
SDAIBB3599Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
Example: Calculate the error budget for a 350
Ω
, 100mV load cell with a
common mode voltage of 2.5V using a gain of 22.28.
From Equation 15:
ppm
mV
V
V
V
OS
2449
100
28
.
22
500
200
=
+
=
µ
µ
From Equation 16:
ppm
mV
nA
I
OS
7
100
2
50
3
=
×
Ω
=
From Equation 17:
ppm
3500
Error
Gain
=
From Equation 18:
ppm
mV
V
ppm
100
100
5
.
2
4
Error
CMR
=
×
=
From Equation 19:
ppm
50
ty
Nonlineari
Gain
=
From Equation 20:
ppm
mV
nV
3
100
3000
noise
10Hz
-
0.1Hz
=
=
Total Unadjusted Error = 6109ppm
Error After Calibration = 53ppm
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