Current,.Voltage,.And.switch.test.(Ma20).Module.instructions - Crystal nVision Reference Recorder Operation Manual

Page 18 • Crystal Engineering Corporation

Current,.Voltage,.and.Switch.Test.(MA20).Module.Instructions

The nVision MA20 module has three operational modes: current measurement, voltage mea-
surement, and switch test. Each mode may be selected via the Setup menu, and can only be
operated one at a time.
To ensure proper connection to the MA20 Module use the following strategy:
1
Ensure that power is off on the circuit that you are about to measure.
2 Ensure your Vision is in correct MA20 Mode: mA, %4-20mA, Voltage, or Switch Test.
3 Insert the Negative (black) 2mm lead jack to the proper location (black terminal) on the MA20
module. Connect the other end of the black lead to the appropriate terminal of the source.
4
Insert the Positive (red) 2mm lead jack to the proper location (red terminal) on the MA20
module. Connect the other end of the red lead to the appropriate terminal of the source.
5
Power up circuit and measure or record the readings as appropriate.
6
Never change modes or electrical sources without first removing the nVision from the circuit.
Failure to do so may damage the nVision.
The following warnings apply to the MA20 module:
WARNINGS:
•
Never install two (2) MA20 modules simultaneously. This configuration may permanently
damage your nVision.
•
Never exceed the maximum specified voltage or current ratings on the MA20 inputs. Do-
ing so may permanently damage the MA20 module.
•
Check the test leads for continuity before using. Replace damaged test leads.
Do not use the probes if they are cracked, have damaged insulation, exposed metal,
or high resistance.
•
Always remove the test
leads from the module
before opening the
battery compartment.
•
When using test lead
probes, always make
sure your fingers are
behind the finger
guards on the probes.
•
Never connect more
than two (2) test leads
to a MA20 module at
a time.
MA20 Functional Diagram
mA
HART
Resettable Fuse
250 Ohm
V
Common
Current Measurement
Voltage Measurement
Switch Test