Meriam MFT 4010 Modular Calibrator_HART Communicator - Manual (Page 52)

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Set Procedure to Manual and Device Out to Conv as shown above. Set Cal Type to Switch by moving the
cursor arrow down to the Cal Type line and pressing the Select soft key. You will also want to set up the
Meas/Sim line and the Measure line for the specific switch test desired. Meas/Sim refers to the action the
MFT needs to perform for the input to the device under test (this could be Measure a pressure or temperature
to a device under test or Simulate a RTD or T/C value to a device under test). Measure refers to the action the
MFT needs to perform for the output from the device under test (for switches this will usually be measuring the
switch circuit voltage on the MFT’s IV line). See the Calibrate Key section of this manual for more details.
Example: Wet bulb temperature switch test
Install a VMA0055 module in bay location S1 of the MFT
Install an RIO4000 module in bay location S3 of the MFT
Place the wet bulb probe of the temperature switch in a temperature bath or dry block tester
Place an RTD in the same bath or tester and connect the RTD to the RIO4000 (see the
RIO4000 section of this manual for more details).
Connect the Volts and Common jacks of the VMA0055 module to the switch to be tested.
Use the MFT interface to set up the Calibrate Key Main Menu screen as follows:
Cal
Cal Setup:
Begin Calibration
Procedure: Manual
DeviceOut: Conv
Cal Type: Switch
RTD Meas / IV Meas
Quick Cal
Smart Trim
View Results
Clear Cal Memory
Up Down Select Back
Calibrate Key Main Menu Screen
for Wet Bulb Temperature Switch
Volts
RTD Cable
Com
RIO4000 module
Wet Bulb
Temperature Switch
Temperature Bath
Reference RTD
VMA0055 module
Volts
Com
NO / NC Com