MAC TOOLS EM721 Manual Del Usuario página 13

To select pulse width function, press the "% DUTY" button again; mS readout is displayed. Pulse width is
the length of time an actuator is energized. For example, fuel injectors are activated by an electronic pulse
from the Engine Control Module. This pulse generates a magnetic field that pulls the injector nozzle valve
open. The pulse ends and the injector nozzle is closed. This Open-to-Closed time is the pulse width and is
measured in milliseconds (mS)
To select the frequency function, press the "% DUTY" button once more; Hz readout is displayed.
Frequency is the number of cycles a signal completes each second.
You can step through RPM, duty cycle, pulse width, and frequency by pressing this "% DUTY" button.
When the rotary switch is in the "RPM IG" position, you can press the "DWL" button to select dwell
measurement function; "DWL°" will appear on the display as an indicatior for the dwell measurement
function.
When in dwell measurement function, you can press the "DWL" button again or the" % DUTY" button to go
back to the previous function from which the meter entered the dwell measurement function.
14. "HOLD" Button
Used to enter or exit Hold mode as well as to turn on or off the backlight.
Press this "HOLD" button to enter the Hold mode. "
meter holds the present reading on the display. In the Hold mode, whenever meter detects a new stable
reading, the meter sounds a beep and displays the new stable reading. To exit the Hold mode, press the
"HOLD" button again. "
Note: When the meter is in the Recording or Relative mode, the Hold function simply freezes the present
reading and will not update the the display with new stable reading.
To turn on or off the backlight, press and hold down this "HOLD" button for 1 second.
15. "REC" Button
Press the "REC" button to enter the Recording mode, "
(The meter will exit autorange mode automatically and stay in the present range when it enters Recording
mode.) This function allows you to record maximum, minimum, and average values for a series of
measurements in the same function and range. This meter beeps each time a new maximum or minimum
value is recorded. Press the "REC" button to scroll through the stored maximum, minimum, and average
values. When an overload is captured, a beeper tone is emitted and the meter displays "OFL" as an overload
indication. The meter can only record for 24 hours in this mode.
Note: In diode or continuity function, the Recording mode is not available.
16. USB Port
800.MACTOOLS
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" disappears.
" appears on the display as an indication and the
" will appear on the display as an indication.
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