V-RTU2000 Series
Chapter 7 - Analog Input Unit
Veesta - Remote Terminal Unit
Technical Specification Manual
Page 49 of 90
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7.2.1 VR-2741 / VR-2742 / VR-2743 Specifications
1.
Microprocessor
:
AT89C2051, 12MHz
2.
Memory
:
2K Bytes Flash ROM, 128 Bytes SRAM
3.
Input Channels
:
4 Channels, differential input
4.
Input Impedance
:
1000 ±0.01% ohm for ±1mA
250 ±0.01% ohm for 4 ~ 20mA
1M ohm for ±5V voltage input
5.
Input Range
:
VR-2741 Model:
±1mA
VR-2742 Model:
4 ~ 20mA
VR-2743 Model:
±5V
6.
Scan Time
:
1 sec
7.
Resolution
:
16 Bit
8.
Accuracy
:
±0.1% at 25°C
9.
Temperature Coefficient
:
50 PPM / °C
10.
CMRR
:
100 dB / 60Hz
11.
NMRR
:
60 dB / 60Hz
12.
Common Mode Voltage
:
250V DC (Min.)
13.
Isolation
Internal to Analog Input :
Channel to Channel
:
3000V DC
35V DC
14.
Surge Withstand Capability :
(SWC)
ANSI/IEEE C37.90.1-1989
(3KV Oscillatory Test, 5KV Fast Transient Test)
15.
Power Requirement
:
+5V DC ±5%, 150mA
16.
Card Dimension
:
160mm * 100mm
17.
Environment
Operating Temperature
:
Storage Temperature
:
Relative Humidity
:
-20°C to 70°C
-40°C to 85°C
10% to 95% non-condensing
