4
THE DATA BANK.
General information.
The data bank was generated using measurements made on a tensile test bench. For each wire rope
diameter stored in the memory, 5 similar wire ropes, but from different origin were selected amongst
the widely sold wire ropes on the market.
Each stored measurement is the average of these measurements made following a 120° rotation of
the sensor around the wire rope.
The measured strain is assumed to be equal to the strain generated by a suspended load.
The measurement wire rope is deemed to have a minimum length of 8 m, and assumed to be
tensioned between a fixed end and a “flexible” end (e.g. an aerial mast) in order to render negligible
the influence of placing the sensor on the cable. Placing the sensor on the wire rope causes a
“shorting” of the wire rope by approximately 1,5 mm.
To achieve increased accuracy, measurement of wire rope not having those specifications may be
carried out using the “Special Mode “
Corrections.
The “raw” signal supplied by the sensor is digitalised and corrected by means of a formula
corresponding to the specification of the measured wire rope.
Example of a 8 mm diameter, rigid wire rope (17 x 1)
1 = 250 daN
4 = 1000 daN
2 = 500 daN
5 = 1250 daN
3 = 750 daN
6 = 1500 daN
40
30
20
10
y = -0,8333x
5
+ 14,708x
4
- 96,583x
3
+ 287,79x
2
- 385,08x + 209
R
2
= 1
-30
-20
-10
0
1
2
3
4
5
6
Specific Calibration
The optional “Specific calibration” mentioned in the price list consist in including a new correction
formula in the data bank. (Don’t mistake it with a “Custom Calibration”)
