Analogue input specification, Nanodac, 2 analogue input specification – Carbolite nanodac User Manual
Page 89: Recorder specification (cont.)
nanodac™
87
MC27 –EN–1.04
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