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4.
"REL" Button
Used to enter or exit Relative mode as well as to turn on or off the USB communication function.
Press this "REL" button to enter Relative mode. The meter stores the present reading as a reference for
subsequent measurements. " " appears as a Relative mode indicator, and the display reads zero.
In Relative mode, when you perform a new measurement, the display shows the difference between the
reference and the new measurement.
To exit the Relative mode, just press the "REL" button again. " " disappears.
•
Note:
The meter enters manual range mode when you enter the Relative mode.
•
When you use Relative mode, the actual value of the object under test must not exceed the full-
range reading of the selected range. Use a higher measurement range if necessary.
•
Relative mode is not available in diode and continuity test functions.
Press and hold down this "REL" button for 1 second to turn on the USB communication function, "
will appear on the display as an indication. To turn off the USB communication function, press and hold
down this "REL" button for 1 second again. "
5.
"DWL" Button
This "DWL" button can be used to select dwell measurement function or switch between resistance and
continuity test functions.
When the meter is in RPM IG function, you can press this "DWL" button to select dwell measurement
mode; "DWL°" will appear on the display as an indication. Dwell is the number of degrees of distributor
rotation where the points remains closed. Dwell can be measured for 1 to 12 cylinders. The conversion
between duty cycle and dwell can be obtained using the following formula:
% Duty Cycle =
Dwell =
When the meter is in the dwell function, you can press the "DWL" button again or the "% DUTY" button to
return to the function the meter was in just before entering dwell function.
When the rotary switch is in the "Ω " position, you can press the "DWL" button to switch between
resistance and continuity test functions. A continuity test can be used to verify that you have a closed
circuit. The continuity function detects opens and shorts lasting as little as 100 milliseconds. In the 400Ω
range, resistance of less than about 40Ω causes the built-in buzzer to sound. This can be a valuable
troubleshooting aid when looking for intermittent faults associated with connections, cables, relays,
switches, etc.
10
All manuals and user guides at all-guides.com
" disappears.
Dwell (in degrees) × No. of Cylinders × 100%
360 degrees
No. of Cylinders
360 degrees
% Duty Cycle
×
"
100%
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