Carbolite nanodac Manuel d'utilisateur Page 89

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nanodac
87 MC27 EN1.04
RECORDER SPECIFICATION (Cont.)
USB port
Number of ports One at rear of instrument
Standard USB1.1
Transmission speeds 1.5Mbits/sec (low speed device)
Maximum current <100mA
Peripherals supported Memory stick (8GB max), Bar code reader, QWERTY keyboard
Update/Archive rates
Sample rate (input/output) 8Hz (4Hz for digital inputs) (4Hz for dual input channels)
Trend update 8 Hz max
Archive sample value Latest value at archive time
Display value Latest value at display update time.
9.2 ANALOGUE INPUT SPECIFICATION
General
Number of anaologue inputs Four
Input types Standard: dc Volts, dc mV, dc mA (external shunt required), thermocouple, RTD (2-wire and 3-wire), digital (contact closure).
Optional: dual mA, dual mV, dual thermocouple.
Input type mix Freely configurable
Sample rate 8Hz (125ms)
Conversion method 16 bit delta sigma.
Input ranges See below.
Mains rejection (48 to 62Hz)
Series mode: >95dB
Common mode: >179dB
Common mode voltage 250Vac max.
Series mode voltage 280mV at lowest range; 5V peak-to-peak, at highest range.
Input impedance See relevant Range specification, below.
Overvoltage protection Continuous: ± 30V RMS
Transient (<1ms): ±200V pk-pk between terminals.
Sensor break detection Type ac sensor break on each input giving quick response with no associated dc errors.
Recognition time: <3 secs.
Minimum break resistance: 40mV, 80mV ranges: 5kΩ; other ranges: 12.5kΩ
Shunt (mA inputs only) Values 1Ω to 1kΩ, mounted externally.
additional error due to shunt: 0.1% input
Isolation Channel to channel: 300V RMS or dc (double insulation)
Channel to common electronics: 300V RMS or dc (double insulation)
Channel to ground: 300V RMS or dc (double insulation)
Dielectric strength Test: BS EN61010, 1 minute type test
Channel to channel: 2500 Vac
Channel to ground: 1500 Vac
DC input ranges
Ranges 40mv, 80mV, 2V; 10V (-4.0 to +10V)
40mV Range Range: -40mV to + 40mV
Resolution 1.9μV (unfiltered)
Measurement noise: 1.0μV peak-to-peak with 1.6s input filter
Linearity error: 0.003% (best fit straight line)
Calibration error: ±4.6μV ±0.053% of measurement at 25°C ambient
Temperature coefficient: ±0.2μV/°C ± 13ppm/°C of measurement from 25°C ambient
Input leakage current: ±14nA
Input resistance: 100MΩ
80mV Range Range: -80mV to + 80mV
Resolution 3.2μV (unfiltered)
Measurement noise: 3.3μV peak-to-peak with 1.6s input filter
Linearity error: 0.003% (best fit straight line)
Calibration error: ±7.5μV ±0.052% of measurement at 25°C ambient
Temperature coefficient: ±0.2μV/°C ± 13ppm/°C of measurement from 25°C ambient
Input leakage current: ±14nA
Input resistance: 100MΩ
2V Range Range: ±2V
Resolution 82μV
Measurement noise: 90μV peak-to-peak with 1.6s input filter
Linearity error: 0.003% (best fit straight line)
Calibration error: ±420μV ±0.044% of measurement at 25°C ambient
Temperature coefficient: ±125μV/°C ± 13ppm/°C of measurement from 25°C ambient
Input leakage current: ±14nA
Input resistance: 100MΩ
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