Measurement ±5 V, 0...5 V

Measurement mode

±5 V

0…5 V

Measuring range, nominal

-5…+5 V

0…5 V

Measuring range, end value (FSV)

5 V

Measuring range, technically usable

-5.368…+5.368 V

0… 5.368 V

PDO resolution (including sign)

24 bit

16 bit 2)

24 bit

16 bit 2)

PDO LSB (Extended Range)

640 nV

163.84 µV

640 nV

163.84 µV

PDO LSB (Legacy Range)

596.. nV

152.59.. µV

596.. nV

152.59.. µV

Input impedance ±Input 1

(internal resistance)

Differential typ. 4.12 MΩ || 11 nF

CommonMode typ. 40 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”

Specific data (not valid for ELM3704-1001 within measuring range 0…5 V)

Measurement mode

±5 V, 0…5 V

Data preliminary = X

Basic accuracy: Measuring deviation at 23°C, with averaging 3)

< ±0.005 %, < ±50 ppmFSV typ.

< ±0.25 mV typ.

 

Extended basic accuracy: Measuring deviation at 0…55°C, with averaging 3) 6)

< ±0.009 %, < ±90 ppmFSV typ.

< ±0.45 mV typ.

 

Offset/Zero point deviation (at 23°C) 3)

EOffset

< 15 ppmFSV

 

Gain/scale/amplification deviation (at 23°C) 3)

EGain

< 40 ppm

 

Non-linearity over the whole measuring range 3)

ELin

< 25 ppmFSV

 

Repeatability, over 24 h, with averaging 3)

ERep

< 2.5 ppmFSV

 

Temperature coefficient 3)

TcGain

< 2 ppm/K typ.

 

TcOffset

< 1.0 ppmFSV/K typ.

< 5 µV/K typ.

 

Noise (without filtering)

ENoise, PtP

< 70 ppm FSV

< 547 digits

< 0.35 mV

 

ENoise, RMS

< 12 ppm FSV

< 94 digits

< 60.00 µV

 

Max. SNR

> 98.4 dB

 

Noisedensity@1kHz

< 0.85 Measurement ±5 V, 0...5 V 1:

 

Noise (with 50 Hz FIR filter)

ENoise, PtP

< 12 ppm FSV

< 94 digits

< 60.00 µV

 

ENoise, RMS

< 2.0 ppm FSV

< 16 digits

< 10.00 µV

 

Max. SNR

> 114.0 dB

 

Common-mode rejection ratio (without filter)

DC: >115 dB typ.

50 Hz: >105 dB typ.

1 kHz: >80 dB typ.

X

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

DC: >115 dB typ.

50 Hz: >115 dB typ.

1 kHz: >115 dB typ.

X

Largest short-term deviation during a specified electrical interference test

±0.03% = 300 ppm FSV typ.

X

3) Valid for ELM3702-00x0 and ELM3704-00x0 from HW01; Valid for ELM3704-10x1 from HW01 except 20 mA, 0‑5 V and 0‑10 V measuring ranges. 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 ±5 V, 0...5 V 2:Fig.11: Representation ±5 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 ±5 V, 0...5 V 3:Fig.12: Representation 0…5 V measurement range

Note: The channel also works in electrically bipolar mode and records negative values in the unipolar measuring ranges (measurement from 0 V, 0 mA, 4 mA, 0 Ω). This enables the channel to provide a precise diagnosis even with signals < 0. In these measuring ranges the limit value for the "Underrange Error" in Extended Mode is -1% of the full scale value (FSV). The limit value can be set in CoE object 0x80n0:32. This avoids irritating error messages if the channel is not wired (e.g. without sensor) or the electrical signal fluctuates slightly around zero. The process data value of 0x00000000 is not undershot.

If the "UnderrangeError" detection is to be set even less sensitive, the magnitude of the negative limit value in the CoE object referred to above can be set even higher.