and tend to drift with time. It is very difficult to set absolute values on
The strobe synthesizes all signals digitally, in small, very precise steps.
These signals are derived from a stable crystal oscillator. There is no
user calibration or adjustment required to ensure an accurate reading.
In the internal flash mode, these steps are as small as 0.1 flashes per
minute. Thus absolute values may be dialed in very easily and
accurately. The strobe’s adjustment knob is actually a digital encoder
that is connected directly to the microprocessor. This knob has 36 definite
steps or clicks per revolution allowing very definite adjustment and can
be turned continuously. This is equivalent to having a 100 turn
potentiometer in an analog unit. Of course you are not expected to turn
this knob that many times to get from the slowest flash rate to the fastest.
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 0.1 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. Turn slower still
for very fine adjustments.
Note: There are maximum and minimum values in each mode, beyond
which you cannot adjust. In the Internal Flash mode, the maximum flash
rate is 14,000 FPM. If you are adjusting the rate and you reach a value
which on the next increment would exceed 14,000 FPM, the display
will not increment. The same is true if you try to adjust the flash rate
below 30 FPM.
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. (Refer to section 4.0)
1.2 Preparation For Use
The strobe may be hand held or mounted on a tripod or other user
supplied bracket using the ¼-20 UNC bushing at the base of the handle.
The AC powered must have its power cord plugged into an AC outlet
(115VAC or 230VAC).
Rev 1.1 February, 1999
Fla sh Rang e Flash Range
Flash Rate Resolution (Setting)
Flash Rate Accuracy (Setting)
30.0 - 14,000.0 FPM (Flashes per Minute)
0.5 - 233.33 FPS (Flahes per Second)
The greater of –0.5 FPM or –0.01% of reading
Flash Range and Display
5.0 to 14,000.0 FPM
0.08 to 233.33 FPS
External flash rates to 0 are acceptable
1 Second Typical
5.0 to 9999.9 FPM –0.1 FP M Resolution
–0.2 FPM Accuracy
10,000 to 200,000 FPM –0.1 FPM Resolution
–0.01% of reading Accuracy
Time Base Ultra stable Crystal Oscillator
Instantaneous (per flash)
(Battery Powered) 10W
(AC Powered) 15W
Flash Duration 10 - 30 microseconds typical
Memory 6 preset user programmable Flash Rates.
100, 500, 1000, 3600, 7200, 14000 FPM
Last settings befor power down remembered and
restored on next power up.
Knob Adjusment - all ranges and modes Rotary Switch with 36 detents per rev.
Display 6 digit alphanumeric backlit LCD display.
Low Battery Indication (Battery powered only).
Individual chevrons for mode display.
Input Power (Battery powered) Internal Rechargable Batteries
6VDC. External AC fast charge.
(AC powered) 115VAC or 230VAC
Trigger to Flash Delay
20 sec min positive pulse, TTL to 24VDC max
< 5 sec
Output Pulse 100 sec positive pulse, 5VDC typical
Remote Sensor Power Supply 5V DC @50mA
Weight (Battery powered) 2‰ lbs (1.2 kg) including
(AC powered) 1‰ lbs (0.68 kg)