7
To change the flash rate:
With the power on, turn the knob counter clockwise to increase the flash
rate and clockwise to decrease it. The knob is velocity sensitive. Turn the
knob slowly to have each “click” is equal to 0.01 FPM. Turning the knob
more quickly will adjust the FPM by larger steps. When adjusting flash
rate, quickly turn the knob (or use the
x2
or
÷2
buttons) to coarsely
change the FPM. Then slowly turn the knob for fine adjustments.
NOTE:
There are maximum and minimum values in each mode
beyond which you cannot adjust. If you are adjusting the
rate and you reach a value which on the next increment would
exceed the maximum flash rate, the display will not increment.
The same is true if you try to adjust the flash rate below the
minimum flash rate.
To multiply or divide the current flash rate by 2:
In addition to the knob, there are two buttons on the back panel
marked
x2
and
÷2
. This enables the user to instantly double or halve
the reading on the display to the maximum or minimum values allowed.
This feature is useful for checking harmonics in the internal flashing
mode.
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 (counter
clockwise) 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.
14
6.0 LIMITATIONS OF REMOTE OPTICAL
SENSORS
Remote Optical Sensors have a limitation when used with the
Phaser-
Strobe pbx
because they sense not only the reflective marker but the strobe
flash as well. If the ROS is positioned near the strobe, the light from the
strobe may cause the ROS to trigger the stroboscope at the wrong time,
especially when using a delayed flash mode. The
Phaser-Strobe pbx
has
an “Input Blanking” feature to allow it to ignore this false trigger.
Even with the Input Blanking, large delays cannot be obtained using an ROS
if the strobe’s flash is triggering the ROS. The duration of the ROS pulse in
response to the strobe’s flash is about 0.5 milliseconds to 1.1 milliseconds
depending on the flash rate. This limits the largest delay possible because
the flash swamps the signal from the ROS, and consequently it will not
provide the pulse from the reflective marker. If large delays are desired,
reposition the ROS so it is away from the strobe’s flash or use a magnetic
sensor.
The Input Blanking feature itself limits the maximum delay, which is
detrimental to non-optical sensors. It is possible to disable (or enable) the
blanking in the
Phaser-Strobe pbx
. (See Section 3.0 MENU.)
7.0 LAMP REPLACEMENT AND FUSE
7.1
Lamp Replacement
WARNING:
Before attempting to remove the lamp, make
sure the stroboscope is turned off and any
mains cord is removed from the AC outlet. Allow
the lamp to cool waiting at least 5 minutes.
