7
Alternate Knob Function (multiple by 2, 3, 4, 5, etc.)
The tuning knob functions differently when
ALT.
is displayed. The current
flash rate is used as an adder. The knob will add (counterclockwise) or
subtract (clockwise) that initial flash rate for each “click” the knob is
turned. This in effect allows the user to multiply the initial flash rate
by 2, 3, 4, 5, etc up to the maximum flash rate. This is very helpful on
fan blades. Using this feature, one can superimpose the blades on top
of each other and check for blade tracking, bent blades, lead and lag
tests, etc.
For example: A 3-blade fan is spinning at 3600 RPM. The strobe is
flashing at 3600 FPM. Press the
ALT FUNCTION
button to display
ALT
.
Then turn the knob counter clockwise 2 clicks. The strobe will now flash
at 10,800 FPM (effectively 3600 times 3). The fans blades will be all
superimposed on each other. One can now see if the blades are out of
alignment, bent, etc. by viewing the blades from the front or viewing
from the side edge of the blades.
To select a flash rate from a Preset (memory) location:
1. Press the
ALT FUNCTION
button and then the
MEMORY
button.
2.
READ
will be displayed.
3. Turn the tuning knob to cycle through the preset flash rates.
4. Once the desired flash rate is displayed, press the
MEMORY
button
to select it. Press any other button to cancel.
5.
DONE
will be displayed.
To store the current flash rate in a Preset (memory) location:
1. Press the
ALT FUNCTION
button and then the
MEMORY
button.
2.
READ
will be displayed.
3. Do NOT
turn the knob and press the
MEMORY
button again.
4.
STORE
will be displayed.
5. Turn the tuning knob to cycle through the memory locations.
