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Calibration of U137, U235 & 237 Series Weight Indicators.
21
*=0 If fewer intervals in the highest range is wanted, Max
Possible ranges in the following table.
Max
Intervals n per range (except highest range) for e (Cs18) and number of ranges in (), (Cs19).
n-1
1(2)
=1
3000
3000
=2
4000
4000
=3
5000
5000
=4
6000
6000
=5
8000
8000
=6 10000
10000
=7 12000
=8 15000
=9 16000
=10 20000
=11 25000
=12 30000
=13 40000
=14 50000
=15 60000
22
*=0
+1 Not used.
+2 Not used.
+4 Not used.
+8 Not used.
Cs 23 to 25 each have three part steps: 1. Step number. 2. Calibration weight. 3. Corresponding AD-value.
23
First calibration point (lowest AD-value).
*00000
Display data 1. Must be an even number.
*008000 Internal AD-value 1. U137 and U235 only presents the 5 most significant digits for the AD-value.
24
Second calibration point.
*10000
Display data 2. Must be even number. One digit increase must be > 1.25 AD-units and < 5000 AD-units.
*945000 Internal AD-value 2. (100.00% = 937,000 units change in AD-value)
25
Third calibration point.
*00000
Display data 3. Must be even number.
*000000 Internal AD-value. Cs25 is not used, when this value is lower than that in Cs24.
Full AD-converter range is from 1480 to 980020, but only values between 7960 and 945060 are allowed (no mode
indicators on) at the calibration. Values above 700000 gradually increase the response time. Note! U137 and U235
only presents the 5 most significant digits for the AD-value.
Negative data (for temperature meters) may be entered in Cs23. However when one step shall be changed, all
three must be entered again in increasing order.
26
Gravity g at place of calibration in m/s . 9.8186 is g at our factory in Torsby.
*9.8186 May be changed: 6.5537
27
Gravity g at end user in m/s . If Cs26 = Cs 27, there is no correction.
*9.8186 May be changed: 6.5537
Variation of g due to latitude
The 1980 formula is recommended. It is based on WGS 84.
g = 9.780326777(1 + 0.0052790414 sin
The gravity g is changing most rapidly with latitude at 45° and is rather stable at the poles and equator.
Latitude:
0° Equator
g
9.7803
An common alternative for m/s is mgal or even µgal. gal is from Galileo. 1 mgal = 0.00001m/s .
Variation of g due to height.
When the formula above is used for calculation of g, the best average height correction value is:
2
g = - 0.003h m/s , where h is height in km.
There is also a variation due to density of the ground and the thickness of the light earth crust.
This is normally lower than 0,001m/s . It is called Bouguer anomaly when the height correction -0.002h is used.
See also B01150 and our catalogue.
1(3)
1(4)
2(2)
2(3)
5(2)
1500
600
2000
800
2500
1000
3000
1200
4000
1600
5000
2000
6000
2400
7500
3000
8000
3200
10000
4000
5000
6000
8000
10000
500 n 10000 Class
2
g
13.1071.
2
g
13.1071.
.
2
+0.0000232718 sin
30°
9.7932
2
2
is chosen here and Max in Cs24 or Cs25.
n-1
1
1(5)
1(6)
2(4)
2(5)
5(3)
5(4)
10(2)
10(3)
20(2)
300
150
400
200
500
250
600
300
800
400
1000
500
1200
600
1500
750
1600
800
2000
1000
2500
1250
3000
1500
4000
2000
5000
2500
6000
3000
100 n 1000 Class
is the latitude.
4
+0.0000001262 sin
45°
60°
9.8062
9.8192
Date:141027 B01950 4(10)
n
2(6)
5(5)
5(6)
10(4)
10(5)
20(3)
20(4)
50(2)
50(3)
100
120
160
200
100
240
120
300
150
320
160
400
200
500
250
600
300
800
400
1000
500
1200
600
6
2
) m/s
90° N pole
g, 0° to 90°
9.8322
0.0519
2
10(6)
20(5)
50(4)
100
125
150
200
250
300
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