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FEATURES
● ACCEPTS HIGH LEVEL VOLTAGE OR PROCESS CURRENT INPUT
● UNIPOLAR OR BIPOLAR CURRENT OUTPUT
● 1500Vrms TRANSFORMER ISOLATION
● ANSI/IEEE C37.90.1-1989 TRANSIENT PROTECTION
● OUTPUT PROTECTED TO 240VAC CONTINUOUS
● 110dB CMR
● 400Hz SIGNAL BANDWIDTH
● 0.05% ACCURACY
● 0.02% LINEARITY
● CSA CERTIFIED, FM APPROVED, CE COMPLIANT
● MIX AND MATCH OM5 TYPES ON BACKPANEL
+EXC
4
4
+Out
6
R
3
LOAD
5
–Out
2
3
–EXC
1
Backpanel
Term Block
FIGURE 1. OM5-IVI Block Diagram.
OM5-IVI
Current Output Modules
Isolation Barrier
NC
Surge
Suppression
and
Protection
NC
1
NC
2
NC
Isolated
Field-Side
Power
DESCRIPTION
Each OM5-IVI current output module provides a single channel of analog
output. The track-and-hold circuit in the input stage can be operated in a
hold mode where one DAC can supply many output modules, or a track
mode where one DAC is dedicated to each module. In addition to the track-
and-hold circuit, each module provides signal buffering, isolation, filtering,
and conversion to a high level current output (Figure 1).
Setting of the track or hold mode is controlled by the logic state of WR EN\,
module pin 23. When pin 23 is low, the track mode is enabled. If pin 23
is open or high, the hold mode is enabled. The module is 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 track and hold circuit. For a low state, simply
connect pin 23, the Write-Enable pin, to I/O Common, pin 19.
The OM5-BP-16-MUX backpanels allow host computer control of the WR
EN\ control line, which allows multiplexing of one host DAC to up to 64
OM5-IVI output modules. During power-up, the output remains at 0mA for
100ms on all models, which allows the track-and-hold circuit to be
initialized.
A special circuit in the output stage of the module provides protection
against accidental connection of power-line voltages up to 240VAC.
Track
Range
&
Select
Hold
+V
–V
Isolated
Computer-Side
Power
Power
Oscillator
20
18
V
/ +I
IN
IN
19
I/O Common / –I
IN
23
WR EN\
17
+5V
16
Power Common
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