Outline and connection drawing, Calculating signal frequency (in hz), Calculating gate time (in seconds) – Dynalco SPD-100L Tachometer User Manual
Page 2: Gate time range selection on 4-position switch
Dynalco Controls, 3690 N.W. 53rd Street, For t Lauderdale, FL 33309 U.S.A.
(954) 739- 4300 • Fax (954) 484-3376 • w w w.dynalco.com • [email protected]
Optional Calibration Method: On-engine
A. Select the appropriate gate time range on the 4-position switch.
B. Connect the magnetic pickup output to terminals 1 & 2.
C. Adjust vernier potentiometer on SPD-100 or SPD-100L until its
display agrees with another precise digital tachometer.
OUTLINE AND CONNECTION DRAWING
SPD-100, SPD-100L, F-15, and F-16 are trademarks of Dynalco Controls.
DYNALCO CONTROLS RESERVES THE RIGHT TO CHANGE THESE SPECIFICATIONS WITHOUT NOTICE.
1. Calculating Signal Frequency (in Hz)
Multiply RPM times the number of teeth (or discontinuities), then
divide by 60. For example, sensing a ring gear with 113 teeth rotating
at 1800 RPM gives a frequency of 3390 Hz.
Signal Frequency in Hz =
Signal Frequency in Hz = = 3390 Hz
2. Calculating Gate Time (In seconds)
Divide the number to be displayed on the SPD-100 or SPD-100L
by the corresponding signal frequency.
Gate Time = = 0.53 seconds
.
3. Gate Time Range Selection on 4-Position Switch
Select either position for each number pair on the switch:
Position 1: 0.26– 0.72 sec.
Position 2: 0.72–1.43 sec.
Position 3: 1.43– 2.85 sec.
Position 4: 2.85–5.70 sec.
(RPM) x (Teeth or Discontinuities)
60
(1800 RPM) x (113 Teeth)
60
1800 RPM
3390 Hz
inches (cm)