Download DL2e Data Logger Hardware Reference

Hardware Reference
Sensors and Input Cards
Analogue Input Card, type LAC1
Analogue Input Card, type LAC1
The LAC1 is a general-purpose analogue input card. It can be set up as a 30 channel
card (‘30-ch’ mode) for simple analogue measurements, or as a 15 channel card (‘15ch’ mode) for higher precision applications.
15-ch mode
Capability
Channels
15 channels are available on one terminal group.
Voltage inputs
Differential. A wire link can be fitted on the screw terminal block for single-ended
measurements. This gives better offset performance and accuracy than 30-ch mode
single-ended measurements.
Resistance measurements
3-wire current excited. A wire link can be fitted on the screw terminal block for 2-wire
measurements, with better performance than 30-ch 2-wire measurements (does not
suffer ±20Ω offset error).
Setting up
15/30 switch
Set to ‘15’ position.
Ribbon cables
Connect from any terminal group on the terminal panel to the card connector marked
‘differential’. Make no connections to the other two connector on the card.
Programming Issues
Programming an Input Channel
Select Input Card Type ‘LAC1, 15-channel’ for the channel group that is connected to
the LAC1 card. The Input Channel tab of the Channel Properties dialog for this channel
group will then offer suitable sensor types in the Sensor Type list, or if you select
<Custom sensor type> the Measurement tab will offer suitable options in the Electrical
Measurement list.
Programming a Sensor Type
In the Measurement tab of the Sensor Type Properties dialog, select one of the
following Electrical Measurement / Connection Requirements combinations:
•
•
•
DC Voltage: ‘Single-ended’, ‘Differential, low CM’, ‘Differential, high CM’
Resistance: ‘2-wire’, ‘3-wire’
Thermocouple: ‘Single-ended’, ‘Differential, low CM’, ‘Differential, high CM.'
30-ch mode
Capability
Channels
15 or 30 channels, one or two terminal groups.
DL2e Hardware Reference
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