TM 4000 Series Digital Tachometers

High-Accuracy, High-Response Rotation Speed Measurement Instruments

The Ono Sokki TM-4000 Series delivers precise rotational speed measurement across a wide frequency range with exceptional accuracy and response time. Engineered for professional measurement, monitoring, and control applications, the TM-4000 Series achieves high-speed signal processing, enhanced linearity, and superior display visibility — making it ideal for industrial automation, R&D testing and production quality control.

Outstanding Accuracy and Fast Response

The TM-4000 Series offers high-accuracy rotation measurement with fast update rates.
For analog output models, linearity has been improved to 0.1% of full scale, and the output refresh time reduced to 1 ms, enabling high-precision equipment monitoring and highly responsive control.

The input circuitry supports a wide range of signal types:

• Sine wave inputs from 1 Hz to 100 kHz
• Square wave pulses from 0.05 Hz to 100 kHz
• Minimum detectable pulse width: 4 μs

This ensures compatibility with a variety of sensors and rotary encoders used in speed, displacement, and position measurement applications.

Flexible Configuration and Ethernet Connectivity

Each TM-4000 model can be customised to suit different system configurations and external interfaces.
Available options include:

• Voltage input
• Comparator output
• DC power supply
• Ethernet communication (optional) for factory network integration and data management.

This flexibility enables seamless integration into modern automated systems and networked production environments.

Improved Noise Immunity

A selectable low-pass filter (OFF / 100 Hz / 20 kHz) is provided to reduce signal noise and improve stability.

Auto-Zero Function

The auto-zero time range is 0.0 s (OFF) – 20.0 s in 0.5-second increments, allowing precise control over measurement reset timing.  (Standard on TM-4100 and TM-4200 models.)

Rapid Deceleration Tracking

During periods when the measured value reaches zero within the auto-zero time setting, the TM-4000 performs deceleration calculations every 1 ms or holds the last valid reading.
This ensures accurate tracking of rapidly changing rotational speeds.  (Standard on TM-4100 and TM-4200 models.)

Key Features & Benefits

• Dual-mode measurement
  The TM-4000 supports both non-contact optical and contact measurement modes. Switch easily between optical probes and contact adapters to suit your application needs.

• Wide speed range & high accuracy
  Measure from low RPMs up to high rotational speeds (depending on model and probe) with precision. Typical accuracy is ±0.02% of reading ±1 digit, ensuring dependable measurements across the scale.

• Multiple display units
  Display speed as rpm (revolutions per minute), rps (revolutions per second), surface speed (m/min, ft/min), frequency (Hz), or count — all at the press of a button.

• Large, backlit LCD display
  An easy-to-read, clear screen shows current, maximum, minimum, and average values. The backlight ensures visibility even in dimly lit environments.

• Data output & connectivity
  Models are available with USB or analog (voltage/current) outputs so that real-time measurement data can be logged, recorded, or fed into external analysis systems.

• Durable, portable design
  The TM-4000 unit is rugged enough for field or shop-floor use while being compact and battery-powered for portability.

• Memory & statistics
  Capture maximum, minimum, and average values over a measurement session. Some models support data logging or snapshot capture for quality control or diagnostic review.

Typical Applications

The TM-4000 Series is trusted across industries for applications including:

• Rotational speed measurement of motors, fans, pumps, and turbines
• Surface speed and linear velocity measurement of belts, rollers, and conveyors
• Preventive maintenance and equipment diagnostics
• Quality control in manufacturing and test labs
• Research and development, including machinery prototyping
• Calibration checks and cross-verification of other tachometers

Why Choose the TM-4000?

• High measurement integrity: trusted precision and repeatability from Ono Sokki
• Versatility: dual-mode measurement and multiple data outputs
• Robustness: built for field, workshop, or lab use
• Local support: full support inside Ireland
• Seamless integration: the TM-4000 works with data acquisition systems, controllers, and test benches

Supplied By Techris Systems

At Techris Systems, we proudly supply the full range of Ono Sokki TM Series Tachometers and compatible sensors. We offer tailored solutions for everything from routine maintenance to complex rotational analysis, with a commitment to precision, reliability, and customer support.

Explore our full range of tachometers here

New to tachometers? Click here to learn more about what they do and how they’re used

FEATURES

Tachometer with Multiple Sensor Connections