Examples of Instrument Calibration
142 MC4 User Guide
Electrical Limit Switches
This procedure suits limit switches with an electrical input. MC4 gen-
erates the switch's input signal and measures the switch's state.
Preparations
1. Connect the instrument's input to MC4's output terminals (see
picture).
2. Connect the switch's out-
put to the measuring ter-
minals in MC4.
3. Select the instrument in
MC4 as presented in
chapter Selecting the In-
strument to Be Calibrat-
ed on page 129 or create
a new instrument as de-
scribed in chapter In-
strument List Window
Menu on page 152.
4. Test the connections be-
fore starting calibration,
i.e. see if the input and
output signal are "live" in
MC4.
Calibration
1. In the calibration window: press F3/
Start
.
2. MC4 does a Prescan if it is enabled. During the prescan,
MC4 searches for approximate values for actuating and deac-
tuating point. This speeds up the final test without sacrificing
accuracy. The defined scan range is used during prescan. Af-
ter a successful prescan MC4 may be set to use a narrower
scan range based on acquired approximate values for actuat-
ing and deactuating point. The prescan test is done only once
in a calibration.
• By default, the Prescan is set to on. If you do not want
MC4 to perform a prescan, disable it by editing the in-
strument's Procedure data (uncheck
Use Prescan
field). When Prescan is set to off, MC4 uses the whole
scan range also during the actual test. See also notes
further on.
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