M140 Multifunction Calibrator / Tester - meatest.cz

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M-140 Multifunction Calibrator
Setting relative deviation using potentiometer
• keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the relative
deviation value in the “minor data” section of the display
• press the potentiometer knob. The display now includes cursor marks which point to the active
digit. Turn the knob to change the value of the active digit
• press the potentiometer knob to change to the mode which allows to change the position of the
active digit. ← and → symbols are displayed above the active digit. The position of the active digit
can be changed by turning the knob.
• turn the knob to change back to the mode which allows to change the value of the active digit
• to get to the default screen, keep pressing the center cursor button until there is no [ _ _ _ _ _ _ _ ]
under any value, or press EXIT button. All values can be set using the buttons or the potentiometer.
If a non-zero relative deviation is set, the main data can be changed as well. The value of the output signal is
always recalculated. If a zero relative deviation is set, the “minor data” section is not displayed.
Change of value by factor of ten
All functions of the calibrator allow the increase of the output value by 10 or reduction of the output value by 10.
Such operation is equivalent to the change of internal range only in U, I, P-E modes. If the change results in
overflow or underflow of calibrator’s range, an error message appears:
Value too large !
Value too small !
if the resulting value is too large
if the resulting value is too small
Range change
• Press the display button labeled “ x10 “ if you want to increase the range, “ :10 “ to decrease the
range.
• The main value shown on the display is increased 10x (reduced 10x)
P-E function changes the current, not voltage, when the range is changed.
R-C function changes the set value 10x. The procedure, however, cannot be used to step the internal
resistance/capacitance ranges, which are not decimal.
T function also has other than decimal ranges and the change of set value 10x therefore does not correspond to
internal range change. Internal range change in this case depends on the temperature sensitivity of the
resistance/capacitance.
Connection / disconnection of output terminals
After switching on the output terminals are disconnected in all modes. Press the OUTPUT button to connect the
output signal to the terminals. Red LED above the OUTPUT button is lit and the information field on the
display shows the following symbol .
Press the OUTPUT button again to disconnect the output terminals. Red LED goes off and the information field
on the display shows the following symbol .
During mode change, output terminals are always disconnected. Output terminals are disconnected also when
changing between voltage and current ranges or when changing between AC and DC ranges is performed.
Operation manual v42 17