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PS081 Datasheet(PDF) 147 Page - ams AG

Part # PS081
Description  Single Chip Solution for Strain Gauges
PDF  155 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

PS081 Datasheet(HTML) 147 Page - ams AG

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acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de
8-2
1
PSØ81
8
Appendix
8.1
High-Resolution Investigations
To investigate the highest possible resolution of the converter we picked a high quality load cell from
HBM and recorded the noise figures. The set up was as follows:
• HBM-SP4C3 load cell, modified to Picostrain wiring
• Only 1 Rspan was used, the other one shortened
• The supply voltage was 4.5 V
• The PCB was the high resolution plug-in module of the evaluation kit
• Median filter was used
Two figures were determined, the noise behavior and the stabilization time. Please see the following
table for an overview:
Table 8.1 Resolution
Divisions
peak-peak
internal
(eff.)
eff. Bits
Upate rate
Stabilization
time
RMS-noise
[nV]
250.000
1.370.000
20.3
5 Hz
1.0 sec.
6.5 nV
150.000
1.040.000
19.9
7.5 Hz
0.6 sec.
9 nV
100.000
680.000
19.3
12 Hz
0.35 sec.
13 nV
80.000
595.000
19.1
16.6 Hz
0.27 sec.
15 nV
60.000
385.000
18.5
30 Hz
0.15 sec.
24 nV
The following 3 noise diagrams show the noise behavior within 1 scale division. In the diagram title
you can see the number of stable scale divisons set, in all cases the noise is deeply within 1 division.
Figure 8.1 Achievable Resolution
Annotations:
PS081 Noise:
250.000 Div. @ 5Hz
Peak-Peak Noise: 0.94 Div. = 265.000 Peak-Peak Div.
rms-Noise: 6.5 nV = 1.37 Mio. eff. Div.
Stabilization time electronic: 1.0 sec.
-1
-0,5
0
0,5
1
1
101
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401
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801
901
#measurement
Member of the ams Group



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