Table of Contents
Advertisement
Analog Voltage Input Modules, Wide Bandwidth
FEATURES
● ACCEPTS MILLIVOLT AND VOLTAGE LEVEL SIGNALS
● HIGH LEVEL VOLTAGE OUTPUTS
● 1500Vrms TRANSFORMER ISOLATION
● ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
● INPUT PROTECTED TO 240VAC CONTINUOUS
● 100dB CMR
● 10kHz SIGNAL BANDWIDTH
● ±0.05% ACCURACY
● ±0.02% LINEARITY
● ±1µV/°C DRIFT
● CSA CERTIFIED, FM APPROVED, CE COMPLIANT
● MIX AND MATCH OM5 TYPES ON BACKPANEL
4
+EXC
NC
4
+In
6
3
V
IN
5
–In
2
3
–EXC
NC
1
Backpanel
Term Block
FIGURE 1. OM5-WMV/WV Block Diagram.
OM5-WMV/WV
Anti-Aliasing
Filter
Surge
Suppression
and
Protection
1
2
+V
Isolated
–V
Field-Side
Power
22
DESCRIPTION
Each OM5 wide bandwidth voltage input module provides a single channel
of analog input which is amplified, isolated, and converted to a high level
analog voltage output (Figure 1). This voltage output is logic-switch
controlled, allowing these modules to share a common analog bus without
the requirement of external multiplexers.
The OM5 modules are designed with a completely isolated computer side
circuit which can be floated to ±50V from Power Common, pin 16. This
complete isolation means that no connection is required between I/O
Common and Power Common for proper operation of the output switch. If
desired, the output switch can be turned on continuously by simply
connecting pin 22, the Read-Enable pin to I/O Common, pin 19.
The input signal is processed through a pre-amplifier on the field side of
the isolation barrier. This pre-amplifier has a gain-bandwidth product of
5MHz and is bandwidth limited to 10kHz. After amplification, the input
signal is chopped by a proprietary chopper circuit. Isolation is provided by
transformer coupling, again using a proprietary technique to suppress
transmission of common mode spikes or surges. The module is powered
from +5VDC, ±5%.
A special input circuit provides protection against accidental connection of
power-line voltages up to 240VAC.
Isochopper™
Amplifier
LPF
Pat Pending
+V
–V
Isolated
Computer-Side
Power
Power
Oscillator
20
V
OUT
19
I/O Common
22
RD EN\
17
+5V
16
Power Common
Advertisement
Table of Contents
