Advanced Tachometer
FT-2500
Simple measurement of rotational speed from sound and vibration.
The FT-2500 advanced tachometer is a rotational meter that measures rotational speed from noise, vibration, or changes in magnetic flux generated by motors and various rotating machines.
By adopting FFT (Fast Fourier Transform) in the calculation unit, it can extract frequency components corresponding to rotational speed from complex waveform signals from microphones, sound level meters, and vibration sensors, and display the rotational speed.
With the incorporation of a new algorithm, the FT-2500 can accurately measure not only the steady rotation of motors and engines but also the acceleration and deceleration of rotation.
Maximum Peak Frequency Method
Calculations are performed at the frequency of the maximum peak of the power spectrum. Typically, measurements are taken in this mode.
Frequency Interval Method
This is a method for determining rotational speed by sequentially calculating the frequency intervals of each degree component of rotation, and judging the most frequently occurring frequency interval as the primary component of rotational speed. It is effective when the primary peak is unstable.
Selection of rotation speed candidates
Out of a maximum of eight power spectra, measurements will focus on any one of the power spectra's peak frequency.
Measurement of the rotation speed of the micro-rotation axis of a motor.
You can easily measure the rotational speed of rotating shafts such as motors without reflective marks. For example, it is also possible to measure small rotating shafts where it is difficult to attach reflective marks or fan motors where the reflected light does not return straight.
It can be easily measured by simply inputting the number of fan blades.
Since it can be measured non-contact, it is suitable for measurements on inspection lines.
Determination of Rotation Direction and Measurement of Rotation Speed of General-Purpose DC Motor
The FT-0501 detects the leakage magnetic flux of a general-purpose DC motor and extracts a frequency signal proportional to the rotational speed. Since it has two built-in coils, the two detected signals have a phase shift, and the principle of determining the rotation direction is based on that phase relationship. This is a very convenient feature for quality control of small DC motors, which are difficult to visually determine the direction. Of course, measuring the rotational speed is also possible.
With the two-phase output, it is also possible to determine the rotation direction.
It comes with a rotation direction determination output (semiconductor relay) that is convenient for CW and CCW judgment on inspection lines.
Measurement of the rotational speed of a compressor using an accelerometer.
Compressors without a rotating shaft, used in household refrigerators, commercial vending machines, air conditioning units, and car air conditioners, can easily measure rotational speed with the combination of the FT-2500 and an acceleration pickup. The acceleration pickup (NP-3000 series) is mounted on an optional magnetic base (NP-0100, 0101) and is set in the best location by checking the signal in various places.
It is easy to measure the rotational speed of compressors without a rotating shaft.
It is possible to measure the rotational speed not only of the compressor alone but also when it is incorporated into the product.
This is suitable for lock determination during refrigerator lock tests.
Measurement of the rotational speed of a DC motor in a fuel pump using a current probe sensor.
DC motors, which are widely used in automotive electrical components, have their current consumption fluctuating in proportion to the number of poles. By detecting the current fluctuations of the DC motor with a current probe sensor and inputting that signal into the FT-2500, the rotational speed of the DC motor can be accurately measured. This method is suitable for measuring the rotational speed of standalone DC motors or motor-integrated products (components) like those found in automotive electrical equipment that allow for lead wire extraction.
Measurement of pump rotational speed using sound pressure
The exhaust sound can be used to easily measure the pump's rotational speed. Generally, since the pump equipment does not have the rotating shaft exposed, conventional pulse detection methods for rotational measurement have been difficult. This example detects the exhaust sound with a microphone and performs rotational measurement.
It can be easily measured by simply setting the number of blades.
It is possible to measure the rotation of pumps without an exposed rotating shaft.
Measurement of rotational speed of embedded motors in household electrical appliances.
The electric toothbrush that converts the rotation of a DC motor into the vibration of a brush, the FT-2500, can measure the rotation speed by detecting the magnetic flux leaking from the built-in DC motor.
It detects the pulsation of the leakage magnetic flux proportional to the number of poles of the DC motor in the finished product.
It is convenient for OK, LOWER, and UPPER judgment on the line, with a two-stage comparator output for upper and lower limits.
Data management is also perfect with RS-232C.
System upgrades are possible at a low cost.
Microphone, engine rotation measurement with an accelerometer.
The sound and vibration caused by the movement of the engine's pistons can be used to measure the engine's rotational speed. This is effective when the engine room is covered and the installation of the engine rotation sensor is not possible.
The number of pulses sets the number of ignition/explosion occurrences per crankshaft rotation.
(Example) For a 4-cycle 4-cylinder engine, the pulse count is 2P/R
Rotational measurement using an engine rotation sensor.
By clamping a sensor to the primary low-voltage and secondary high-voltage wires of the automobile, the engine's rotational speed can be obtained. It can be measured simply by inputting the number of ignitions per revolution.
The pulse count sets the number of ignitions/explosions per revolution.
(Example) For a 4-cycle engine:
When measuring on the primary side, set the value to half the number of cylinders.
When measuring on the secondary side, set to 0.5P/R since there is 1 pulse for every 2 revolutions.
Rotation measurement of a small fan using an accelerometer.
The rotational speed of small rotating bodies, such as fans, is measured. The vibration of the rotating body depends on the rotational motion. By measuring the frequency of the vibrations, the rotational speed of the body can be obtained.
Measurement of engine RPM from muffler sound
The exhaust sound of the car is used to measure the engine's rotational speed. The exhaust sound contains pulsating components caused by the engine's rotation. From the frequency components of those pulsations, it is possible to measure the engine's rotational speed.
The number of pulses is set to the number of ignitions/explosions per crankshaft rotation.
Depending on the performance of the exhaust, it may not be possible to measure.
Measurement of vacuum cleaner rotation using a sound level meter.
Even in devices where the motor is not visible, like a vacuum cleaner, the rotation speed of the motor can be measured from the operating sound.
Rotation measurement of an embedded motor using an accelerometer.
Even motors that are built inside devices like hair dryers and electric drills and are not visible can have their rotational speed measured from rotational vibrations.
Engine measurement by cigar lighter socket sensor.
(* The cigar lighter socket sensor FT-0801 has been discontinued)
You can connect it to the Power Outlet installed in cars and construction machinery, and it can detect the ignition noise of the voltage output from the Power Outlet to measure the engine speed.
Simultaneous measurement of the rotation speed and direction of the fuel pump.
Simultaneously measures the rotational speed of the fuel pump and determines its rotation direction. The fuel pump is used in various fields such as automobiles, but since it cannot be disassembled, direct measurement of the rotational speed and direction from the rotating shaft is not possible. Here, a leakage magnetic flux detector (FT-0501) is attached to the fuel pump to detect the leakage magnetic flux, and the periodically changing magnetic flux is calculated for frequency using an advanced tachometer (FT-2500), allowing for the measurement of the embedded motor's rotational speed and direction.
| Input section | ||
|---|---|---|
| compatible sensor | FT-0501/FT-0801*, IP-292/IP-296, IP-3000A/IP-3100, VP-202/VP-1220, OM-1200/OM-1500 Constant current drive sensors, various microphones, various accelerometers, etc. |
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| Measurement Department | ||
| Measurement Mode |
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| Rotation direction determination | (Possible when using FT-0501) | |
| measurement accuracy | ±2 times rotational speed resolution ± 1 count | |
| averaging process | Moving average processing, average score: OFF, 2, 4, 8, 16 | |
| filter function | Arbitrarily settable (set one upper limit and one lower limit) | |
| Display Section | ||
| Display update time | 0.5 ± 0.2 seconds | |
| Measurement display range | 0 to 999,999 r/min (0 to 10,000 Hz) | |
| Output Section | ||
| Analog output voltage range | The rotation speed at 0-10 V / 0-F.S. 10 V output can be set arbitrarily. | |
| Analog output update time | Steady rotation mode: within 500 ms Acceleration and deceleration rotation mode: within 250 ms |
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| Sensor signal monitor output | For monitoring sensor signals (output switched between analog output and another type). | |
| comparator output | Upper and lower limit judgment, rotation direction judgment, OK judgment Output method: semiconductor relay (3 circuits built-in) |
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| Pulse output | Output display rotation speed × equivalent frequency of setting P/R (Hi: 4.5 V or more, Lo: 1 V or less) |
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| external interface | RS-232C, external command input terminal | |
| Memory section * | ||
| Condition Memory | Remember three types of setting conditions. | |
| Compliance standards (CE marking) | ||
| Low Voltage Directive | 2014/35/EU Standard EN 61010-1 | |
| EMC instruction | 2014/30/EU Standard EN 61326-1 | |
| RoHS Directive | Directive 2011/65/EU Standard EN IEC 63000 | |
| General Specifications | ||
| Power Supply | AC 100-240 V (50/60 Hz) | |
| Power consumption | 32 VA or less | |
| Operating temperature range | 0 to +40 °C | |
| Storage Temperature Range | −10 to +55 °C | |
| Outline Dimensions | 144 (W) × 72 (H) × 180 (D) mm
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| Weight | under 2 kg | |
| Accessories | Panel mounting brackets, stand legs, rubber feet, connectors (D-SUB <15pin, plug>), power cable (3P-3P, 1.9 m), instruction manual. | |
| Price | ||
| Option |
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Ignition Detector (for Primary Side) IP-292 -
Ignition Detector (for Secondary Side) IP-296 -
Engine Rotation Detector IP-3000A -
Engine Rotation Detector IP-3100 -
Ignition Pulse Detector OM-1200/OM-1500 -
Rotational Detector for DC Motors FT-0501 -
Engine Rotation Detector VP-202/ VP-1220 -
Cigar lighter socket sensor FT-0801Discontinued -
Piezoelectric accelerometer NP-2000/NP-3000 series *1 -
Microphone + Preamplifier MI Series -
sound level meter LA-1411 / LA-7000 Series