External Power Requirements:

All models are signal-powered. Lighted versions: 12 or 24 Vdc, depending on model.

Display:

Four active digits (0 to 9999), non-blinking LCD display; character height of 0.5 inches (14 mm). Display contrast increases with increasing ambient light.

Input Valve Voltage:

From pickups, pulsers, shaft encoders, etc.
‹ Minimum signal amplitude: 2.5 Vrms.
‹ Maximum permissible signal: 15 Vrms.
The SPD-100 automatically limits pickupsignals at approximately 10 volts peak-topeak. Input impedance is 100 Ω in serieswith a 6 volt Zener diode.

Input Signal Frequency:

Maximum input signal frequency of 20,000 Hz. Lowest frequency range limited by gate time and corresponding numerical display.

Isolated Circuit:

All circuitry is totally floating, i.e. totally isolated and insulated from the case and from ground.

Operating Temperature Range:

–5o F to +175oF (–20o C to +80oC)

Storage:

–40oF to +195oF (–40oC to +90o C).

Vibration:

MIL STD 810C; Method 514.2;Curve Q; Procedure V; Modified to 500 Hz upper limit. 5 Hz to 10 Hz @ 0.2 inches D.A.; 10 Hz to 18 Hz @ 1.0 g (peak); 18 Hz to 57 Hz @ 0.06 inches D.A.; 57 Hz to 500 Hz @ 10 g (peak).

Accuracy:

One rpm resolution; within 0.5% (0.1% typical at room ambient) under all combined environmental conditions.

Gate Time Ranges:

SPD-100 Series : field-selectable from 0.26 to 5.7 seconds.
SPD-108 Series: field-selectable from 0.13 to 2.85 seconds.

This accommodates calibrations for an extremely broad range of corresponding pulses per second

Magnetic Pickups

Dynalco Magnetic Pickups M102 and M107 are used with the SPD-100 Series in most applications. Refer to Dynalco Magnetic Pickup brochure for various types and characteristics.
For low-speed applications, or to permit operation with larger gaps, the ultrahigh sensitivity M142 can be used.
For intrinsically safe applications Dynalco Controls offers various models, with the M202 and M134 the most frequently used.

Weight:

1 lb (0.45 kg)