SHIMPO DT-900 - Manual (Page 12)

9
Internal Triggering Mode
To use the DT-900 stroboscope in internal triggering mode:
1. Turn power switch on.
2. Press “MODE” button and the power indicator will light up, the tachometer is default to internal mode.
Unless there are sensors connected to the external signal connector, the display will show “EXT.Mode
No Signal”. Press mode again to select “TachMode”, then press mode again for “Internal mode”.
3. Aim light beam at object under observation. The optimal distance between the strobe and moving
object is approximately 2 feet.
4. Measure RPM by turning the dial to adjust the flashing rate to the rotational speed of the object.
NOTE: To achieve a particular RPM or FPM quickly, use the “x2” or “÷2” switches and then the dial for
fine-tuning.
External Triggering Mode
To use the DT-900 stroboscope in external triggering
mode:
1. Firmly plug in external sensor. This unit accepts
TTL Logic, high of +5V and low of 0V.
2. Turn power switch on.
3. Press “MODE” button to select External Mode option. Power indicator will light up and automatically
detect the presence of an external source of signal, otherwise the indicator will lit up to red to indicate
absence of external source of signal
FPM Flash indicator will flash in correspondence with input signal. The input signal will be
displayed as FPM (Flash per Minute). Check Appendix for Additional Information
Ext.Mode Ext.Mode Ext.Mode Ext.Mode
no input
External Mode
, automatically look for an external source of
signal. If source is found, LED power indicator will light up
green otherwise it will be red, and the message “no input”
appears. Maximum 12,500 FPM, Minimum 15 FPM. If max
value is exceeded the strobe will stop flashing but the clock
source frequency will continue to be displayed.