Measurement ±20 mV
Measurement mode | ±20 mV | |
---|---|---|
Measuring range, nominal | -20…+20 mV | |
Measuring range, end value (FSV) | 20 mV | |
Measuring range, technically usable | -21.474…+21.474 mV | |
PDO resolution (including sign) | 24 bit | 16 bit 2) |
PDO LSB (Extended Range) | 2.56 nV | 655.36 nV |
PDO LSB (Legacy Range) | 2.384.. nV | 610.37.. nV |
Input impedance ±Input 1 (internal resistance) | Differential typ. 4.12 MΩ || 11 nF CommonMode typ. 40 nF against SGND |
2) The analog measurement is always done with 24 bits, in 16-bit mode the eight least significant bits are cut off. For further information see chapter “Commissioning”/ “Process data overview”
Specific data
Measurement mode |
±20 mV |
Data preliminary = X | |||
---|---|---|---|---|---|
Basic accuracy: Measuring deviation at 23°C, with averaging 3) |
< ±0.04 %, < ±400 ppmFSV typ. < ±8.0 µV typ. |
| |||
Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 3) 6) |
< ±0.077 %, < ±770 ppmFSV typ. < ±15.4 µV typ. |
| |||
Offset/Zero point deviation (at 23°C) 3) |
EOffset |
< 380 ppmFSV |
| ||
Gain/scale/amplification deviation (at 23°C) 3) |
EGain |
< 60 ppm |
| ||
Non-linearity over the whole measuring range 3) |
ELin |
< 100 ppmFSV |
| ||
Repeatability, over 24 h, with averaging 3) |
ERep |
< 25.0 ppmFSV |
| ||
Temperature coefficient 3) |
TcGain |
< 4 ppm/K typ. |
| ||
TcOffset |
< 20.0 ppmFSV/K typ. < 0.40 µV/K typ. |
| |||
Noise (without filtering) |
ENoise, PtP |
< 540 ppm FSV |
< 4219 digits |
< 10.80 µV |
|
ENoise, RMS |
< 90 ppm FSV |
< 703 digits |
< 1.80 µV |
| |
Max. SNR |
> 80.9 dB |
| |||
Noisedensity@1kHz |
< 0.03 |
| |||
Noise (with 50 Hz FIR filter) |
ENoise, PtP |
< 80 ppm FSV |
< 625 digits |
< 1.60 µV |
|
ENoise, RMS |
< 13.0 ppm FSV |
< 102 digits |
< 0.26 µV |
| |
Max. SNR |
> 97.7 dB |
| |||
Common-mode rejection ratio (without filter) |
DC: >115 dB typ. |
50 Hz: >105 dB typ. |
1 kHz: >80 dB typ. |
X | |
Common-mode rejection ratio (with 50 Hz FIR filter) |
DC: >115 dB typ. |
50 Hz: >115 dB typ. |
1 kHz: >115 dB typ. |
X | |
Largest short-term deviation during a specified electrical interference test |
Value to follow |
X |
3) Valid for ELM3702-00x0 and ELM3704-00x0 from HW01; Valid for ELM3704-10x1 from HW01 except 20 mA, 0‑5 V and 0‑10 V measuring ranges. Specifications of predecessor-HW on request.
6) Calculated value according to equation in chapter "General information on measuring accuracy/measurement uncertainty" for quick estimation of usability over the specified ambient temperature range in operation (Tambient). In real use, for example at a relatively constant ambient temperature Tambient, a lower (better) achievable uncertainty is attained. A specific calculation according to chapter "General information on measuring accuracy/measurement uncertainty" is recommended, especially if the instrument allows a wider ambient temperature range in operation than 0...55 °C.

Note: In Extended Range Mode the Underrange/Overrange display in the PDO status has the character of an information/warning when the nominal measuring range is exceeded, i.e. no Error is displayed in the PDO status and LED. If the technical measuring range is also exceeded, Error = TRUE is also displayed. The detection limit for Underrange/Overrange Error can be set in the CoE. In Legacy Range mode, an Underrange/Overrange event also leads to an Error in the PDO status. |