Crystal nVision Lab Reference - Manual (Page 30)

Modules  28
nVision Operation Manual
Switch Test Mode
The nVision may be used to detect switch closures. Select the Switch Test mode through the Setup menu to
properly configure the nVision prior to connection and use. The illustration denotes the proper Switch Test
connection scheme to the MA20 module.
MA20 module Switch Test connection.
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CURRENT, VOLTAGE, AND SWITCH TEST (MA20) MODULE SPECIFICATIONS
Modes
Current
mA %4–20, %10–50
Current with HART Resistor mA %4–20, %10–50
Voltage V
Switch Detection Open Closed
Connection
2mm banana jacks for sheathed plugs. 12.7mm (0.5 in) spacing.
Terminals
MA20 Functional Diagram
mA
HART
250 Ohm
Resettable Fuse
V
Common
Voltage Measurement
Current Measurement
Switch Test