Measurement ±1.25 V

Measurement mode

±1.25 V

Measuring range, nominal

-1.25…+1.25 V

Measuring range, end value (FSV)

1.25 V

Measuring range, technically usable

-1.342…+1.342 V

PDO resolution

24 bit (including sign)

PDO LSB (Extended Range)

160 nV

PDO LSB (Legacy Range)

149.. nV

Basic accuracy: Measuring deviation at 23°C, with averaging 1)

< ±0.0055 %, < ±55 ppmFSV

< ±0.1 mV

Extended basic accuracy: Measuring deviation at 0…55°C, with averaging, typ. 1) 6)

< ±0.014 %, < ±140 ppmFSV

< ±0.2 mV

Offset/Zero point deviation (at 23°C) 1)

EOffset

< 15 ppmFSV

Gain/scale/amplification deviation (at 23°C) 1)

EGain

< 40 ppm

Non-linearity over the whole measuring range 1)

ELin

< 30 ppmFSV

Repeatability, over 24 h, with averaging 1)

ERep

< 5 ppmFSV

Temperature coefficient, typ.1)

TcGain

< 4 ppm/K

TcOffset

< 0.4 ppmFSV/K

< 0.50 µV/K

Common-mode rejection ratio (without filter) 2)

DC: >115 dB typ.

50 Hz: >105 dB typ.

1 kHz: >80 dB typ.

Common-mode rejection ratio (with 50 Hz FIR filter) 2)

DC: >115 dB typ.

50 Hz: >115 dB typ.

1 kHz: >115 dB typ.

Largest short-term deviation during a specified electrical interference test 2)

±0.05 % = 500 ppmFSV typ.

Input impedance ±Input 1

(internal resistance)

 

Differential typ. approx. 10 MΩ || 11 nF

CommonMode typ. approx. 40 nF against SGND

1) Valid for ELM3148-00x0 since HW05, ELM3146-00x0 since HW03, ELM3144-00x0 since HW03, ELM3142-00x0 since HW02; specifications of predecessor-HW on request

2) Preliminary data

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.

Measurement mode

±1.25 V

Noise (without filtering)

ENoise, PtP

< 100 ppmFSV

< 781 digits

< 0.13 mV

ENoise, RMS

< 16 ppmFSV

< 125 digits

< 0.02 mV

Max. SNR

> 95.9 dB

Noisedensity@1kHz

< 0.89 Measurement ±1.25 V 1:

Noise (with 50 Hz FIR filter)

ENoise, PtP

< 21 ppmFSV

< 164 digits

< 0.03 mV

ENoise, RMS

< 3.5 ppmFSV

< 27 digits

< 4.38 µV

Max. SNR

> 109.1 dB

Preliminary specifications:

Measurement mode

±1.25 V

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

< ±0.005% = 50 ppmFSV typ.

Extended basic accuracy: Measuring deviation at 0 to 60°C, with averaging

< ±0.01% = 100 ppmFSV typ.

Offset/Zero Point deviation (at 23°C)

EOffset

< 70 ppmFSV

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

EGain

< 55 ppm

Non-linearity over the whole measuring range

ELin

< 25 ppmFSV

Repeatability

ERep

< 20 ppmFSV

Temperature coefficient

TcGain

< 8 ppm/K typ.

TcOffset

< 5 ppmFSV/K typ.

Common-mode rejection ratio (without filtering)

DC: >115 dB typ.

50 Hz: >105 dB typ.

1 kHz: >80 dB typ.

Common-mode rejection ratio (with 50Hz FIR filtering)

DC: >115 dB typ.

50 Hz: >115 dB typ.

1 kHz: >115 dB typ.

Largest short-term deviation during a specified electrical interference test

±0.05% = 500 ppmFSV typ.

Measurement ±1.25 V 2:
Representation ±1.25 V 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.

Measurement ±1.25 V 3:
Frequency response of measuring range ±1.25 V, fsampling = 1 kHz, integrated filters 1/2 deactivated