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 6)

< ±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

Common Mode typ. 500 kΩ || 0.2 nF against AGND

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 the equation for estimating usability at the given ambient temperature point or estimating usability over the specified ambient temperature range in operation (Tambient) as stated in chapter "General information on measuring accuracy/measurement uncertainty". 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. Measurement ±20 mV 1:

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. Measurement ±20 mV 2:

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

Measurement ±20 mV 3:Fig.20: Representation ±20 mV measurement range

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.