Analog measurement specifications
6 single-ended (SE) or 3 differential (DIFF) terminals individually configurable for voltage, thermocouple, current loop, ratiometric, and period average measurements, using a 24-bit ADC. One channel at a time is measured.
Voltage measurements
Terminals:
- Differential Configuration: DIFF 1H/1L – 3H/3L
- Single-Ended Configuration: SE1 – SE6
Input Resistance:
- 5 GΩ typical (fN1 = 50/60 Hz)
- 300 MΩ typical (fN1 = 4000 Hz)
Input Voltage Limits: -100 to +2500 mV
Sustained Input Voltage without Damage:
- SE1-SE2: –6 V, +9 V
- SE3-SE6: ±17 V
DC Common Mode Rejection:
- >120 dB with input reversal
- ≥90 dB without input reversal
Normal Mode Rejection:
- >71 dB at 50 Hz
- >74 dB at 60 Hz
Input Current @ 25 °C:
- ±.08 nA typical (fN1 = 50/60 Hz)
- ±13 nA typical (fN1 = 4000 Hz)
Filter First Notch Frequency (fN1) Range:
Analog Range and Resolution:
Differential with input reversal | Single-ended and differential without input reversal |
||||
---|---|---|---|---|---|
Notch frequency (fN1) (Hz) |
Range1 (mV) |
RMS (µV) |
Bits2 | RMS (µV) |
Bits2 |
4000 | –100 to +2500 –34 to +34 |
23 3.0 |
16.8 14.5 |
33 4.2 |
16.3 14.0 |
400 | –100 to +2500 –34 to +34 |
3.8 0.58 |
19.4 16.8 |
5.4 0.82 |
18.9 16.3 |
50/603 | –100 to +2500 –34 to +34 |
1.6 0.23 |
20.6 18.2 |
2.3 0.33 |
20.1 17.7 |
Accuracy (does not include sensor or measurement noise):
- 0 to 40 °C: ±(0.04% of measurement + offset)
- –40 to 70 °C: ±(0.1% of measurement+ offset)
Voltage Measurement Accuracy Offsets:
Typical offset (µV RMS) | |||
---|---|---|---|
Range (mV) | Differential with input reversal |
Differential without input reversal |
Single-ended |
–100 to +2500 | ±20 | ±40 | ±60 |
–34 to +34 | ±6 | ±14 | ±20 |
Measurement Settling Time: 10 µs to 50 ms; 500 µs default
Multiplexed Measurement Time:
These are not maximum speeds. Multiplexed denotes circuitry inside the data logger that switches signals into the ADC.
Measurement time = (multiplexed measurement time + settling time) • reps +0.8 ms
Differential with input reversal |
Single-ended or differential without input reversal |
|
---|---|---|
Example fN11 (Hz) | Time2 (ms) | Time2 (ms) |
4000 | 2.9 | 1.4 |
400 | 14.6 | 7.3 |
50/60 | 103 | 51.5 |
See also Voltage measurements.