Measurement IEPE ±10 V

Measurement mode

±10 V

Measuring range, nominal

-10…+10 V 3)

Measuring range, end value (FSV)

10 V

Measuring range, technically usable

-10.737…+10.737 V

PDO resolution (including sign)

24 bit

16 bit 2)

PDO LSB (Extended Range)

1.28 µV

327.68 µV

PDO LSB (Legacy Range)

1.192.. µV

305.18.. µV

Input impedance ±Input 1

(internal resistance)

Differential typ. 2 MΩ || 1 nF

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”

3) For IEPE measurement applies: The input voltage must not fall below -5 V with respect to GND, the measuring accuracy is then no longer given. This means a measurement down to -10 V with respect to GND is only possible if at the same time an offset of at least +5 V is applied, as is usual with IEPE supply.

Preliminary specifications in cursive format

Measurement mode

±10 V

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

< ±0.01 % = 100 ppm FSV typ.
< ±tbd. typ.

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

< ±tbd. % = tbd. ppm FSV typ.
< ±tbd. typ.

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

EOffset

< 70 ppmFSV

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

EGain

< 60 ppm

Non-linearity over the whole measuring range 1)

ELin

< 25 ppmFSV

Repeatability, over 24 h, with averaging 1)

ERep

< 20 ppmFSV

Noise (without filtering)

ENoise, PtP

< 650 ppmFSV

< 5078 digits

< 6.5 mV

ENoise, RMS

< 110 ppmFSV

< 859 digits

< 1.1 mV

Max. SNR

> 79.2 dB

Noisedensity@1kHz

< 15.56 Measurement IEPE ±10 V 1:

Noise (with 50 Hz FIR filter)

ENoise, PtP

< 400 ppmFSV

< 3125 digits

< 4 mV

ENoise, RMS

< 75 ppmFSV

< 586 digits

< 750 µV

Max. SNR

> 82.5 dB

Temperature coefficient 1)

TcGain

< 8 ppm/K typ.

TcOffset

< 5 ppmFSV /K typ.
< tbd. typ.

Crosstalk (without filter)

DC: >115 dB typ.

50 Hz: >105 dB typ.

1 kHz: >80 dB typ.

Crosstalk (with 50 Hz FIR filter)

DC: >115 dB typ.

50 Hz: >115 dB typ.

1 kHz: >115 dB typ.

Largest short-term deviation during a specified electrical interference test

±0.03 % = 300 ppmFSV typ.

1) Valid for ELM3704-00x1 from HW00, ELM370x-00x0 from HW01; specifications of predecessor-HW on request

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 IEPE ±10 V 2:Fig.9: Representation ±10 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.