Measurement ±320 mV

ELM334x

Measurement mode

±320 mV

Measuring range, nominal

-320…+320 mV

Measuring range, end value (FSV)

320 mV

Measuring range, technically usable

-343.6…+343.6 mV

PDO resolution (including sign)

24 bit

16 bit 2)

PDO LSB (Extended Range)

40.96 nV

10.48576 µV

PDO LSB (Legacy Range)

38.14.. nV

9.765.. µV

Basic accuracy: Measuring deviation at 23°C, with averaging 6)

< ±0.015 %, < ±150 ppmFSV typ.

< ±48 µV typ.

Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 6)

< ±0.0225 %, < ±225 ppmFSV typ.

< ±72 µV typ.

Offset/Zero point deviation (at 23°C)

EOffset

< 40 ppmFSV

Gain/scale/amplification deviation (at 23°C)

EGain

< 140 ppm

Non-linearity over the whole measuring range

ELin

< 40 ppmFSV

Repeatability, over 24 h, with averaging

ERep

< 10 ppmFSV

Temperature coefficient

TcGain

< 5 ppm/K typ.

TcOffset

< 1 ppmFSV/K typ.

< 0.32 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 ±320 mV 1:

Noise (with 50/60 Hz FIR filter 5))

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

50/60 Hz: > tbd. dB

1 kHz: > tbd. dB

Common-mode rejection ratio (with 50/60 Hz FIR filter 5)), typ.

DC: > tbd. dB

50/60 Hz: > tbd. dB

1 kHz: > tbd. dB

ELM3348 (1 ksps)

Noise (without filtering)

ENoise, PtP

< 137 ppmFSV

< 1070 digits

< 43.84 µV

ENoise, RMS

< 23 ppmFSV

< 180 digits

< 7.36 µV

Max. SNR

> 92.8 dB

Noisedensity@1kHz

< 104.09 Measurement ±320 mV 2:

Noise (with 50/60 Hz FIR filter 5))

ENoise, PtP

< 33 ppmFSV

< 258 digits

< 10.56 µV

ENoise, RMS

< 5 ppmFSV

< 39 digits

< 1.6 µV

Max. SNR

> 106 dB

Common-mode rejection ratio (without filter), typ.

DC: > 115 dB

50/60 Hz: > 45 dB

1 kHz: > 50 dB

Common-mode rejection ratio (with 50/60 Hz FIR filter 5)), typ.

DC: > 115 dB

50/60 Hz: > 115 dB

1 kHz: > 50 dB

5) the 50/60 Hz filter setting must be selected via the settings in the CoE depending on the local mains frequency (50 or 60 Hz); the respective nominal mains frequency then applies as the measuring point for common mode rejection or crosstalk

Measurement ±320 mV 3:Fig.16: Representation ±320 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.