HITEC D2414, Manual

Page: 71 / 81

Hitec Luxembourg S.A. |
5, Rue de l’Église, L-1458 Luxembourg
www.hitec.lu | info@hitec.lu | Tel.: (+352) 49 84 78 - 1 | Fax. (+352) 401303
File Name: HTCA_003-DADS-UserManual.docx
Document Type: End User Manual | Version date: 01/05/2010 | Last Printed: 15/02/2011 Page 71/81
Strain-gauge Linearity
There is also the possibility to verify the linearity of the strain-
gauge easily on an Excel sheet, adding different weights and
so see if it retrieves values on a straight line.
To make this linearity, you have to proceed as described on
Torque Calibration for the Type H
– Machine Calibration helped
in additional by a Torque Calibration Kit. This Torque
Calibration Kit can be supplied by Hitec as additional part; its
part number is
DABS-CKTQ .
In case of need you can ask for the excel sheet by email.
Figure 17
– Torque
Calibration Kit
Material list
Wei
gh
ts
Model Q. Weight [g] Comment
DABS-0128 1 112 / 114
Weight support block. Mass
value stamped on block
DABS-CKTQ 5 1.680 ± 2
Torque calibration Kit, Mass
values are stamped on the
blocks
10 kg weight 1 10.000 Typical laboratory 10 kg weight
At Hitec we have a 10Kg weight with which we do all the adjustments
, but in case you don’t
have it, you can take a least a 5Kg and calculate its ADC value with the functions below:
For Strain-gauge Model 10 kg (15 Nm): X = (0,382417 x Y) + 100
For Strain-gauge Model 15 kg (20 Nm): X = (0,262757 x Y) + 100
For example with a 5Kg you get: X = (0,382417 x 5000) + 100 = 2012
The Procedure is now to put the weights one after the other on the strain-gauge and note at
each step the ADC value displayed by the Figure 15.
Make sure that the weights do not touch
other components than the weight
support!
In the excel sheet you will find a table where you can enter the weights and ADC values. The
table below will show the ADC values,
more or less, according with the
functions, in the excel sheet if an error
is found, it will be marked in red.
Weight Load [g] DAC [bit]
A 0 100
B 112 142
C 1860 854
D 1861 1566
E 1860 2277
F 1861 2988
G 1861 3700
H 10112 3967