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, typ. 1) 6) | < ±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 | |
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 from HW05, ELM3146-00x0 from HW03, ELM3144-00x0 from HW03, ELM3142-00x0 from HW02; specifications of predecessor-HW on request
2) Preliminary data
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.
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 | |||
Noise (with 50/60 Hz FIR filter 5)) | ENoise, PtP | < 21 ppmFSV | < 164 digits | < 0.03 mV |
ENoise, RMS | < 3.5 ppmFSV | < 27 digits | < 4.38 µV | |
Max. SNR | > 109.1 dB | |||
ELM3142 / ELM3144
Measurement mode | ±1.25 V | ||
|---|---|---|---|
Common-mode rejection ratio (without filter), typ. | DC: > 95 dB | 50/60 Hz: > 70 dB | 1 kHz: > 50 dB |
Common-mode rejection ratio (with 50/60 Hz FIR filter 5)), typ. | DC: > 95 dB | 50/60 Hz: > 115 dB | 1 kHz: > 50 dB |
ELM3146 / ELM3148
Measurement mode | ±1.25 V | ||
|---|---|---|---|
Common-mode rejection ratio (without filter), typ. | DC: > 60 dB | 50/60 Hz: > 60 dB | 1 kHz: > 50 dB |
Common-mode rejection ratio (with 50/60 Hz FIR filter 5)), typ. | DC: > 60 dB | 50/60 Hz: > 100 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
Fig.14: 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. |
Fig.67: Frequency response of measuring range ±1.25 V, fsampling = 1 kHz, integrated filters 1/2 deactivated