Crystal nVision Lab Reference User Manual
Page 28
Modules
26
nVision Operation Manual
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CURRENT, VOLTAGE, AND SWITCH TEST (MA20) MODULE INSTRUCTIONS
The nVision MA20 module has three operational modes: current measurement, voltage measurement, 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, %10-50mA (MA20+), 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.
!
WARNINGS: The following warnings apply to the MA20 module:
•
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. Doing 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.
Current Mode
The nVision is capable of measuring current in three different modes. They are:
•
mA: Measured current is displayed (mA). The module is capable of measuring inputs up to 55mA
•
4–20%: Current is displayed as a percentage of the 4–20mA current range of the module. Where: 4mA = 0%, and 20mA = 100%
•
10–50%: Current is displayed as a percentage of the 10–50mA current range of the MA20+ module. Where: 10mA = 0%, and 50mA = 100%