Through the Sigma-Delta conversion method of the analog signals on the TM5SEAISG, there is, in principal, an effective resolution of the displayed value.
If the ADC of the TM5SEAISG always outputs a 24 bit value, the attainable resolution according to calculation is always smaller than the 24 bit converter resolution. The effective resolution depends on the data rate and the bridge factor defined in the ConfiguOutput00 ADC configuration register.
For example, a data rate of 2.5 Hz and a bridge factor of 2 mV/Vdc result in an effective resolution of 18.7 bits. Therefore, the amount of information in the low-order bits (marked in gray) is only natural in theory and is subject to heavy disturbances.
The AnalogInput00 channel contains the raw value of the ADC for the full-bridge strain gauge with 24 bit resolution.
The tables below provides the effective resolution (in bits) of the full-bridge strain gauge value depending on the electronic module configuration (data rate, bridge factor). Refer to ADC Configuration Register.
|
|
Bridge factor |
|||
|---|---|---|---|---|
|
± 16 mV/Vdc |
± 8 mV/Vdc |
± 4 mV/Vdc |
± 2 mV/Vdc |
|
|
Data rate (Hz) |
Bits |
Bits |
Bits |
Bits |
|
2.5 |
21.3 |
20.8 |
19.7 |
18.7 |
|
5 |
20.7 |
20.3 |
19.3 |
18.3 |
|
10 |
20.4 |
19.9 |
18.9 |
17.9 |
|
15 |
20.1 |
19.3 |
18.7 |
17.7 |
|
25 |
19.7 |
19.2 |
18.5 |
17.5 |
|
30 |
19.6 |
19.0 |
18.1 |
17.1 |
|
50 |
19.4 |
18.8 |
17.9 |
16.9 |
|
60 |
19.3 |
18.8 |
17.8 |
16.8 |
|
100 |
19.1 |
18.5 |
17.4 |
16.4 |
|
500 |
18.0 |
17.3 |
16.3 |
15.3 |
|
1000 |
17.2 |
16.5 |
15.6 |
14.6 |
|
2000 |
16.6 |
16.1 |
15.3 |
14.3 |
|
3750 |
16.2 |
15.7 |
14.7 |
13.7 |
|
7500 |
15.8 |
15.3 |
14.4 |
13.4 |
|
|
Bridge factor |
|||
|---|---|---|---|---|
|
± 256 mV/Vdc |
± 128 mV/Vdc |
± 64 mV/Vdc |
± 32 mV/Vdc |
|
|
Data rate (Hz) |
Bits |
Bits |
Bits |
Bits |
|
2.5 |
23 |
22.6 |
22.1 |
21.7 |
|
5 |
22.3 |
22.4 |
21.9 |
21.3 |
|
10 |
22.3 |
22 |
21.6 |
21 |
|
15 |
22 |
21.7 |
21.3 |
20.7 |
|
25 |
21.8 |
21.4 |
21.1 |
20.5 |
|
30 |
21.7 |
21.3 |
20.8 |
20.4 |
|
50 |
21.3 |
21.1 |
20.5 |
19.9 |
|
60 |
21.3 |
20.9 |
20.4 |
19.8 |
|
100 |
20.9 |
20.7 |
20.2 |
19.6 |
|
500 |
20.1 |
19.6 |
19.1 |
18.6 |
|
1000 |
19 |
18.6 |
18.1 |
17.5 |
|
2000 |
18.5 |
18.1 |
17.8 |
17 |
|
3750 |
18.1 |
17.8 |
17.3 |
16.6 |
|
7500 |
17.7 |
17.3 |
16.9 |
16.2 |
