Measurement ±20 mV
ELM334x
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 | < ±0.055 %, < ±550 ppmFSV typ. < ±11 µV typ. | ||
Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 6) | < ±0.0905 %, < ±905 ppmFSV typ. < ±18.1 µV typ. | ||
Offset/Zero point deviation (at 23°C) | EOffset | < 490 ppmFSV | |
Gain/scale/amplification deviation (at 23°C) | EGain | < 190 ppm | |
Non-linearity over the whole measuring range | ELin | < 150 ppmFSV | |
Repeatability, over 24 h, with averaging | ERep | < 50 ppmFSV | |
Temperature coefficient | TcGain | < 10 ppm/K typ. | |
TcOffset | < 20 ppmFSV/K typ. < 0.4 µV/K typ. | ||
Largest short-term deviation during a specified electrical interference test | < ±tbd. % = tbd. ppmFSV typ. | ||
Input impedance ±Input 1 (internal resistance)
| Differential typ. approx. 10 MΩ || 6 nF CommonMode typ. approx. 20 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”
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.
ELM3344 (1 ksps)
Noise (without filtering) | ENoise, PtP | < tbd. ppmFSV | < tbd. digits | < tbd. µV |
ENoise, RMS | < tbd. ppmFSV | < tbd. digits | < tbd. µV | |
Max. SNR | > tbd. dB | |||
Noisedensity@1kHz | < tbd. | |||
Noise (with 50 Hz FIR filter) | ENoise, PtP | < tbd. ppmFSV | < tbd. digits | < tbd. µV |
ENoise, RMS | < tbd. ppmFSV | < tbd. digits | < tbd. µV | |
Max. SNR | > tbd. dB | |||
Common-mode rejection ratio (without filter), typ. | DC: >tbd. dB | 50 Hz: >tbd. dB | 1 kHz: >tbd. dB | |
Common-mode rejection ratio (with 50 Hz FIR filter), typ. | DC: >tbd. dB | 50 Hz: >tbd. dB | 1 kHz: >tbd. dB |
ELM3348 (1 ksps)
Noise (without filtering) | ENoise, PtP | < tbd. ppmFSV | < tbd. digits | < tbd. µV |
ENoise, RMS | < tbd. ppmFSV | < tbd. digits | < tbd. µV | |
Max. SNR | > tbd. dB | |||
Noisedensity@1kHz | < tbd. | |||
Noise (with 50 Hz FIR filter) | ENoise, PtP | < tbd. ppmFSV | tbd. | < tbd. µV |
ENoise, RMS | < tbd. ppmFSV | < tbd. digits | < tbd. µV | |
Max. SNR | > tbd. dB | |||
Common-mode rejection ratio (without filter), typ. | DC: >tbd. dB | 50 Hz: >tbd. dB | 1 kHz: >tbd. dB | |
Common-mode rejection ratio (with 50 Hz FIR filter), typ. | DC: >tbd. dB | 50 Hz: >tbd. dB | 1 kHz: >tbd. dB |
![Measurement ±20 mV 3:](Images/png/1904226059__Web.png)
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. |