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 | |||
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:](Images/png/1904197899__Web.png)
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:](Images/png/8733396875__Web.png)