- OMEGA Engineering, Inc. Heater Product Manual
22
OM5-WMV/WV
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
FIGURE 1. OM5-WMV/WV Block Diagram.
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.
Anti-Aliasing
Filter
+In
–In
–EXC
Backpanel
Term Block
1
2
6
5
3
NC
Surge
Suppression
and
Protection
Isolated
Field-Side
Power
4
3
2
1
+EXC
–V
+V
V
IN
4
NC
–V
LPF
+V
Power
Oscillator
Isolated
Computer-Side
Power
V
OUT
20
22
I/O Common
RD EN\
+5V
17
16
Power Common
19
Isochopper™
Amplifier
Pat Pending