Dewetron PUREC, Technical Reference Manual

Page: 17 / 58

17 17
450182 • PU[REC] • Technical Reference Manual • Printing version 1.0.0 • November 2
nd
, 2020
MAIN SYSTEM
Typical CMRR in differential mode
100 dB @ 50 Hz; >70 dB @ 1 kHz
Low pass Filter (-3 dB, IIR)
1 Hz to 40 % of sample rate freely programmable or OFF
Characteristic
Bessel or Butterworth
Filter order
2nd , 4th, 6th, 8th
Analog antialiasing filter
3 rd order Butterworth
Bandwidth (-3 dB, deactivated IIR filter)
70 kHz 3
rd
order Butterworth filter
Crosstalk fin 1 kHz [10 kHz]
>108 dB
Channel to channel phase mismatch
typically <30 nsec when using the same input range
Common mode voltage
±12.5 V
DC
Overvoltage protection (IN+, IN-, Sense)
±50 V
DC
Digital IN specification
Digital Input
8 CMOS/TTL compatible digital inputs; weak pullup via 100 k
Ω
Overvoltage protection
±30 V, 50 V
PK
(for 100 ms)
Counter
2 counter channels; TTL input; shared with digital inputs
Counter modes
Event counting
Basic event counting, gated counting, up/down counting and encoder mode (X1, X2 and X4)
Waveform timing
Period, frequency, pulse width duty cycle and edge separation
Sensor modes
Encoder (angle and linear)
Digital OUT specification
Digital output
4 DO; TTL
Output indication
LED (green = high; off = low)
Maximium current
25 mA continuously
Power-on default
Low
Interfaces
CAN bus
1 CAN Bus; not isolated
CAN specification
CAN 2.0B
CAN Physical Layer High Speed
Bus pin fault protection ±36 V
Termination Programmable: High impedance or 120
Ω
1)
1 year accuracy 23 °C ±5 °C
2) LP Filter in auto mode
3) SFDR excluding harmonics
4) ENOB calculated from SNR
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