Dynalco SPD-108L Tachometer - Manual

© 2002 Azonix-Dynalco 145F-12041, Rev. 1
If necessary, turn to the reverse side of this card
to calculate Signal Frequency and Gate Time.
SPD-108 and SPD-108L
Signal-Powered Tachometer
Calibration Instructions
The SPD -108 and SPD -108L tachometers are normally factory-
calibrated to the customer-specified number of sensing teeth or
discontinuities, sensing speed, and desired numerical display.
To calibrate an SPD-108 or SPD -108L
1. Remove the sealing plug on the back of the housing.
2. Apply the calculated signal frequency to terminals 1 and 2.
A Dynalco F-16 or F-15 signal generator is ideal.
3. Select the appropriate gate time range on the 4-position
switch. See label on back of SPD-108; SPD-108L; or Item 3, reverse
side of card.
4. Adjust the vernier potentiometer for the desired display.
See below .
Shown with sealing plug removed
4-position switch
Vernier potentiometer
[clockwise to increase display reading;
counterclockwise to decrease]
(For example: 60 /113 teeth = 0.53 sec. gate time)
QUICK
GATE TIME
CALCULATION
}
60
Number of
Teeth
Assumes the pickup is “seeing” the
gear of interest directly, not through
a step up or step down ratio
.
{
See label on back of SPD-108, SPD-108L for additional information
Example: If 3390 Hz = 1800 RPM, then gate time is 0.53 seconds.
1. Apply 3390 Hz to terminals 1 and 2 on tachometer (no polarity).
2. Turn the gate time range switch to (either) position number 2 to
select gate time range of 0.38–0.76 seconds.
3. Adjust the vernier potentiometer to obtain a display of 1800.