Meriam MFT 4010 Modular Calibrator_HART Communicator - Manual (Page 10)

5
DISPLAY SCREEN
The display screen displays measurements from the modules
installed in sensor bays S1, S2, and S3 plus the voltage or
current measured by the MFT base unit. Measurements are
identified on the display by lines with “S1”, “S2”, and “S3”
designators for sensor module bay locations and by “V/I” for
voltage or current measurements. The measured values are
shown with the corresponding unit of measure.
Measured values displayed here are subject to the MFT’s Smart Damp system unless otherwise changed using the
Damp Soft Key (see details in the section below). Smart Damp eliminates electronic circuit noise but does not slow
the display of changes in measured signal. The result is a very stable but responsive digital display of measured
values.
SOFT KEY MENU OPTIONS
On the bottom of the main menu screen in Measure Mode the following definitions are displayed just above the
white soft keys. These definitions indicate the function of each soft key.
Zero
Zeros the installed sensor modules, if applicable, and integral mA/Volts meter. The LCD will display “Zero in
Progress” as this function is carried out. Sensors should be zeroed prior to making measurements to
provide an accurate zero reference. Make sure that no physical signal is applied to the MFT when
performing this function. To prevent unintentional zero offset, a Zero command will be aborted if more than
±5% of full scale signal is being measured by any MFT sensor. Absolute pressure modules cannot be zeroed
until the applied pressure is less than 5% of full scale. This prevents the accidental corruption of the absolute
zero reference essential to absolute pressure module performance.
Mn/Max
The Mn/Max key allows the user to display the minimum and maximum measured value each sensor has
measured since this function was activated. The min/max values are displayed below the normal pressure or
V/mA reading. To reset the Mn/Max function, toggle the Mn/Max key once for off and again to restart.
Damp
The MFTs default damping mode is Smart Damping for the most stable yet responsive display of measured
values. The Damp soft key lets the user choose exponential or no damping for the duration of the On cycle.
To change the damping mode, toggle the Damp soft key or see the Configuration Settings section of
this manual.
Pressing the Damp soft key once from Measure Mode initiates an exponential averaging function over a user
selectable time constant. This function smoothes the peaks and valleys of pulsating measurements for a
more stable display. A “D” symbol appears in the top line of the LCD display when exponential Damping is
activated. To change the time setting for exponential Damping refer to the MFT Configuration Settings
section of this manual.
Zero Mn/Max Damp More
Measure
S1:
VMA mA
S2:
DDN PSI
S3: No Probe
RIO
IV:
mA
Zero Mn/Mx Damp More
0.000
0.000
0.000
Measure Mode Main Screen