Applications: Speed and acceleration measurement of automotive dynamos/alternators, etc.

- Automotive dynamo/alternator requires measurement of the rotational variation of the generator because the engine explosion causes rotational irregularities.
- It is important to measure speed and acceleration variations simultaneously with respect to the speed variation at startup, idling state, and running.
- The FAM-3921 frequency accelerometer can input pulse signals from a magnetic gear speed sensor or other device and output both speed and acceleration simultaneously in analog form, allowing the phenomena to be checked at a glance.

Gear sensor Pickup Sensors IMG, GP, FDP Series Gear Important points At startup when the cell starter is turned During idling Acceleration change during driving Speed and acceleration Simultaneous analog output 1ms update	One input → Pulse signal	FAM-3921	→ Analog output	Acceleration analog output

				Starter Cranking	Idling	Acceleration change	Idling
				Speed and acceleration Simultaneous analog output
				Speed analog output

				Starter Cranking	Idling	Driving	Idling

What we can do with measurement
- Both velocity and acceleration are output in analog form, so you can recognize the phenomenon at a glance.
- Speed or acceleration can be displayed by switching the display.
- Analog output and BCD output with 1ms update can be installed. (Option)
- BCD output and RS-485 option can be installed at the same time as the analog output option.

Gear sensor
- Gear sensor is capable of detecting from 0Hz, so it is possible to measure the motion at the start and stop of movement in detail.
- The sensing section uses a two Hall element differential system, so it is unaffected by surrounding magnetic fields and provides stable detection with suppressed jitter.

Selection Points
- Analog output renewal 1ms～
- BCD output, RS-485 option available
- Unique Periomatic™ calculation method: High-precision and high-speed response to start of motion from standstill, ultra-low speed, high-speed, and sudden speed change (sudden acceleration, sudden stop), etc.
- Gear sensor capable of sensing from low RPM (0Hz)

Products

Points	Overviews
IMG series Magnetic Gear Speed Sensor Product page	Line driver output Semi-open collector output Differential (balanced) CMOS logic output Wide power supply range Conical press™	- Stable output by eliminating magnetic field noise and suppressing jitter in the detection area by using a two Hall element differential system. - Fully sealed metal case with one-piece construction for IP67 compliance, suitable for environments where water or oil adheres to the detector. - Measurable frequency range: 0Hz to 20kHz - Operating temperature range: -20°C to 105°C
FDP series Magnetic Gear Speed Sensor Product page		- Consists of a single Hall element, magnet, and signal processing circuit. - The detection surface is a completely sealed metal case with an integrated structure, IP67 compliant, and can be used in environments where water or oil adheres to the sensor.
FAM-3921 Frequency Acceleration Meter Product page	RS-485 RS-232C Analog output 2ch alarm output BCD output	- Simultaneous analog output of speed and acceleration 1ms update - RS-232C, 2-channel alarm output standard - Velocity /Speed analog output 0-10V - Acceleration analog output ±10V

Products

Points

Overviews

IMG series
Magnetic Gear Speed Sensor
Product page

Line driver output Semi-open collector output Differential (balanced) CMOS logic output Wide power supply range Conical press™

- Stable output by eliminating magnetic field noise and suppressing jitter in the detection area by using a two Hall element differential system.
- Fully sealed metal case with one-piece construction for IP67 compliance, suitable for environments where water or oil adheres to the detector.
- Measurable frequency range: 0Hz to 20kHz
- Operating temperature range: -20°C to 105°C

FDP series
Magnetic Gear Speed Sensor
Product page

- Consists of a single Hall element, magnet, and signal processing circuit.
- The detection surface is a completely sealed metal case with an integrated structure, IP67 compliant, and can be used in environments where water or oil adheres to the sensor.

FAM-3921
Frequency Acceleration Meter
Product page

RS-485 RS-232C Analog output 2ch alarm output BCD output

- Simultaneous analog output of speed and acceleration 1ms update
- RS-232C, 2-channel alarm output standard
- Velocity /Speed analog output 0-10V
- Acceleration analog output ±10V