Measurement ±20 mV
ELM300x
|
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 | |
|
Basic accuracy: Measuring deviation at 23°C, with averaging 1) |
< ±0.04 %, < ±400 ppmFSV typ. < ±8.0 µV typ. | ||
|
Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 1) 6) |
< ±0.077 %, < ±770 ppmFSV typ. < ±15.4 µV typ. | ||
|
Offset/Zero point deviation (at 23°C) 1) |
EOffset |
< 380 ppmFSV | |
|
Gain/scale/amplification deviation (at 23°C) 1) |
EGain |
< 60 ppm | |
|
Non-linearity over the whole measuring range 1) |
ELin |
< 100 ppmFSV | |
|
Repeatability, over 24 h, with averaging 1) |
ERep |
< 25.0 ppmFSV | |
|
Temperature coefficient 1) |
TcGain |
< 4 ppm/K typ. | |
|
TcOffset |
< 20.0 ppmFSV/K typ. < 0.40 µV/K typ. | ||
|
Largest short-term deviation during a specified electrical interference test |
< ±0.04% = 400 ppmFSV typ. | ||
|
Input impedance ±Input 1 (internal resistance)
|
Differential typ. 4.1 MΩ || 11 nF CommonMode typ. 40 nF against SGND | ||
1) Valid for ELM3002 from HW04, ELM3004 from HW05, production since mid of 2021; specifications of predecessor-HW on request
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”
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.
ELM3002 (20 ksps)
|
Noise (without filtering) |
ENoise, PtP |
< 700 ppmFSV |
< 5469 digits |
< 14.00 µV |
|
ENoise, RMS |
< 120 ppmFSV |
< 938 digits |
< 2.40 µV | |
|
Max. SNR |
> 78.4 dB | |||
|
Noisedensity@1kHz |
< 24.0 | |||
|
Noise (with 50 Hz FIR filter) |
ENoise, PtP |
< 80 ppmFSV |
< 625 digits |
< 1.60 µV |
|
ENoise, RMS |
< 16.0 ppmFSV |
< 125 digits |
< 0.32 µV | |
|
Max. SNR |
> 95.9 dB | |||
|
Common-mode rejection ratio (without filter), typ. |
DC: >115 dB |
50 Hz: >105 dB |
1 kHz: >80 dB | |
|
Common-mode rejection ratio (with 50 Hz FIR filter), typ. |
DC: >115 dB |
50 Hz: >115 dB |
1 kHz: >115 dB | |
ELM3004 (10 ksps)
|
Noise (without filtering) |
ENoise, PtP |
< 560 ppmFSV |
< 4375 digits |
< 11.20 µV |
|
ENoise, RMS |
< 100 ppmFSV |
< 781 digits |
< 2.0 µV | |
|
Max. SNR |
> 80.0 dB | |||
|
Noisedensity@1kHz |
< 28.28 | |||
|
Noise (with 50 Hz FIR filter) |
ENoise, PtP |
< 70 ppmFSV |
547 |
< 1.40 µV |
|
ENoise, RMS |
< 14.0 ppmFSV |
< 109 digits |
< 0.28 µV | |
|
Max. SNR |
> 97.1 dB | |||
|
Common-mode rejection ratio (without filter), typ. |
DC: >115 dB |
50 Hz: >105 dB |
1 kHz: >80 dB | |
|
Common-mode rejection ratio (with 50 Hz FIR filter), typ. |
DC: >115 dB |
50 Hz: >115 dB |
1 kHz: >115 dB | |
|
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. |