Measurement ±20 mA, 0…20 mA, 4…20 mA, NE43

ELM310x

Measurement mode	±20 mA		0…20 mA		4…20 mA		3.6…21 mA (NAMUR NE43)
Measuring range, nominal	‑20…+20 mA		0…20 mA		4…20 mA		4…20 mA
Measuring range, end value (FSV)	20 mA
Measuring range, technically usable	‑21.474…+21.474 mA, overcurrent-protected		0 …21.474 mA, overcurrent-protected		0…21.179 mA, overcurrent-protected		3.6…21 mA, overcurrent-protected
Fuse protection	Internal overload limiting, continuous current resistant
PDO resolution (including sign)	24 bit	16 bit ²⁾	24 bit	16 bit ²⁾	24 bit	16 bit ²⁾	24 bit	16 bit ²⁾
PDO LSB (Extended Range)	2.56 nA	655.36 nA	2.56 nA	655.36 nA	2.048 nA	524.288 nA	2.048 nA	524.288 nA
PDO LSB (Legacy Range)	2.384.. nA	610.37.. nA	2.384.. nA	610.37.. nA	1.907.. nA	488.29.. nA	n.a.
Common-mode voltage U_cm	max. ±10V related to –Uv (internal ground)
Input impedance ±Input 1 (internal resistance)	Differential typ. approx. 150 Ω \|\| 11 nF CommonMode typ. approx. 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:

Measurement mode		±20 mA, 0…20 mA, 4…20 mA, NE43
Basic accuracy: Measuring deviation at 23°C, with averaging ³⁾		< ± 0.008 %, < ± 80 ppm_FSV typ. < ±1.6 µA typ.
Extended basic accuracy: Measuring deviation at 0…55°C, with averaging ^{3) 6)}		< ±0.0135 %, < ±135 ppm_FSV typ. < ± 2.7 µA typ.
Offset/Zero point deviation (at 23°C) ³⁾	E_Offset	< 25 ppm_FSV
Gain/scale/amplification deviation (at 23°C) ³⁾	E_Gain	< 60 ppm
Non-linearity over the whole measuring range ³⁾	E_Lin	< 45 ppm_FSV
Repeatability, over 24 h, with averaging ³⁾	E_Rep	< 10 ppm_FSV
Temperature coefficient ³⁾	Tc_Gain	< 3 ppm/K typ.
Temperature coefficient ³⁾	Tc_Offset	< 1.5 ppm_FSV/K typ. < 0.03 nA/K typ.
Largest short-term deviation during a specified electrical interference test		Value to follow… ppm_FSV typ.

³) Valid for ELM3102-00x0 since HW02; valid for ELM3104-00x0 since HW04; 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 (T_ambient). In real use, for example at a relatively constant ambient temperature T_ambient, 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.

ELM3102 (20 ksps)

Noise (without filtering)	E_{Noise, PtP}	< 150 ppm_FSV	< 1172 [digits]	< 3.00 µA
	E_{Noise, RMS}	< 25 ppm_FSV	< 195 [digits]	< 0.50 µA
	Max. SNR	> 92.0 dB
	Noisedensity@1kHz	< 5.0
Noise (with 50 Hz FIR filter)	E_{Noise, PtP}	< 12 ppm_FSV	< 94 [digits]	< 0.24 µA
	E_{Noise, RMS}	< 2.0 ppm_FSV	< 16 [digits]	< 40.0 nA
	Max. SNR	> 114.0 dB
Common-mode rejection ratio (without filter), typ.		DC: < 5.5 nA/V	50 Hz: < 70 nA/V	1 kHz: < 2 µA/V
Common-mode rejection ratio (with 50 Hz FIR filter), typ.		DC: < 5.5 nA/V	50 Hz: < 20 nA/V	1 kHz: < 20 nA/V

ELM3104 (10 ksps)

Noise (without filtering)	E_{Noise, PtP}	< 118 ppm_FSV	< 922 [digits]	< 2.36 µA
	E_{Noise, RMS}	< 19 ppm_FSV	< 148 [digits]	< 0.38 µA
	Max. SNR	> 94.4 dB
	Noisedensity@1kHz	< 5.37
Noise (with 50 Hz FIR filter)	E_{Noise, PtP}	< 12 ppm_FSV	< 94 [digits]	< 0.24 µA
	E_{Noise, RMS}	< 2.0 ppm_FSV	< 16 [digits]	< 40.0 nA
	Max. SNR	> 114.0 dB
Common-mode rejection ratio (without filter), typ.		DC: < 5.5 nA/V	50 Hz: < 70 nA/V	1 kHz: < 2 µA/V
Common-mode rejection ratio (with 50 Hz FIR filter), typ.		DC: < 5.5 nA/V	50 Hz: < 20 nA/V	1 kHz: < 20 nA/V

Current measurement range ±20 mA

Measurement ±20 mA, 0…20 mA, 4…20 mA, NE43 3: — Representation current measurement range ±20 mA

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.

Current measurement range 0…20 mA

Measurement ±20 mA, 0…20 mA, 4…20 mA, NE43 4: — Representation current measurement range 0…20 mA

Current measurement range 4…20 mA

Measurement ±20 mA, 0…20 mA, 4…20 mA, NE43 5: — Representation current measurement range 4…20 mA

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.

Current measuring range 3.6…21 mA (NAMUR)

Measurement ±20 mA, 0…20 mA, 4…20 mA, NE43 6: — Chart: current measuring range 3.6…21 mA (NAMUR)

	Only Extended Range mode for measuring range 4 mA NAMUR Legacy Range mode is not available for this measurement range. The Extended Range Mode will be set automatically and although a corresponding write access to the CoE Object 0x8000:2E (Scaler) is not declined, the parameter is not changed.