CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE, Instruction Manual

Page: 14 / 23

23
ENGLISH
22
ENGLISH
•
if the time base is, for instance, three times the period being measured
(see figure below), the updating of the display is made at the end of the
time base (end gate time) as average calculation of the measured
periods P=(P1+P2+Pn)/n
F7 : A, frequency (speed) clockwise and counter clockwise rotation
sensing mode.
This measuring capability is ideal for monitoring the relative speed of
shafts, conveyor belts and other moving machinery taking into account
the rotation mode, showing the reverse speed by means of a " - " sign.
The rotation sensing is detected by means of a phase difference,
measured using the two input channels available as standard in the
instrument. If we assume that the channel A is the main channel ( see
figure on the next page), the channel B is used to detect if a signal
arrives "after" (phase displacement) the signal of the main channel
(begin gate time) meaning "clockwise" rotation or "before" meaning
mixture deviation that is connected to the quality result of the mixture
itself.
F6 : 1/A, period or average period mode
The instrument measures the frequency of input A or input B and
executes the following calculation: display=1/(Fa/Pu.1*PS.1). The time
period is directly connected to the time base that has been programmed
in the instrument (for low frequencies or long time periods):
•
if the time base is in the range of the period being measured (see figure
below), the updating of the display is as fast as possible and any period
changing is updated immediately on the display;