Precision Timer / Stopwatch Calibrator

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Precision Timer / Stopwatch Calibrator

Model: TFC 1901

Range for Non-contact : 0 to 204,000 RPM

Display : 4.3″ Multi colour TFT touchscreen display.

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  • Introduction
  • Specifications
  • Key Features
  • Application
  • Accessories

Product Details

The Timer Calibrator TFC-1901 is a precision instrument. It is Primarily designed to generate the accurate time intervals for calibrating time-related devices, ensuring traceability to National/International standards.

with a internal 10MHz OCXO/TCXO time base Oscillator or External input Frequency from standard Lab source and also with Non contact RPM calibrating source all in a single unit — with potential-free MOSFET trigger output connector terminal to support an external Multi-stopwatch fixture (Model : TFC-19F) — to eliminate manual START/STOP timing error and 10MHz OCXO/TCXO Reference frequency output is provided on rear side terminal of Instrument.

Parameter Specification
Model TFC 1901
Display 4.3″ Multi colour TFT touchscreen display.
Range – Digital Electronic Stopwatch 100 ms to 86400.00000 s
Range – Mechanical Stopwatch & Electronic Industrial Timer 1 s to 86400.00000 s
Resolution 10 µs to 1 s (selectable: 0.00001 / 0.0001 / 0.001 / 0.01 / 0.1 / 1 s)
Display Format Time in HH:MM:SS.fraction
Mode 1 — Precision Stopwatch / Timer
A high-resolution elapsed-time counter driven directly from the Precision internal Oscillator reference. Supports free-run stopwatch and preset auto-stop timer operation, with Master and DUC triggering.
Time base Directly referenced to the internal 10 MHz OCXO/TCXO.
Auto-Stop Auto-Stop at user-set target time.
Master vs. calibration mode Master: touch control, outputs enabled, Auto-Stop available, Up/Down count.

Calibration: external-input control, outputs disabled, input detection enabled, no Auto-Stop.
Accuracy ** Digital Electronic Stopwatch:
OCXO: ±(5.02 × 10⁻⁸ × Te + 2 ms)
TCXO: ±(1.003 × 10⁻⁶ × Te + 2 ms)

Mechanical Stopwatch & Electronic Industrial Timer:
OCXO: ±(5.02 × 10⁻⁸ × Te + 5 ms)
TCXO: ±(1.003 × 10⁻⁶ × Te + 5 ms)

Where:
Te = elapsed time
Trigger I/O Master: generates START/STOP/RESET output pulses 30 µs and continuous output.

Calibration: accepts external START/STOP/RESET. Pulse mode (START/STOP), RESET; Continuous mode also selectable.
Mode 2 — Frequency Totalizer
A precision pulse totalizer that counts input events entirely in hardware, converts the count to elapsed time at the selected resolution for the external input frequency, and simultaneously measures live input frequency referenced to the OCXO/TCXO.
Run Time 24 hours continuous run at 100 kHz without rollover (1.728 × 10¹⁰ pulses).
Input / Counting Dedicated pulse-count input, standard logic-level pulse train; fully hardware-based counting — no missed/double-counted pulses even at highest rates.
Frequency Measurement Measured against OCXO/TCXO reference ~once/sec, OCXO/TCXO-grade accuracy; range from 1 Hz–100 kHz.
Resolution / Frequency Map 0.00001s ↔ 100kHz, 0.0001s ↔ 10kHz, 0.001s ↔ 1kHz, 0.01s ↔ 100Hz, 0.1s ↔ 10Hz, 1s ↔ 1Hz — each input pulse advances displayed time by exactly one count tick.
Mode 3 — RPM Generator
The front-panel LED blinks at 50% duty cycle, matching the RPM value — e.g., 1 RPM = 1 blink/sec. In RPM Mode, this lets the user visually check the RPM without needing contact, using a stroboscope or similar method.
Range for Non-contact 0 to 204,000 RPM.
Output / Conversion Front-panel LED output, 50% duty-cycle square wave; f (Hz) = RPM / 60.

NOTE:
1. Due to continuous improvement, published specifications may change without notice.
2. **If we use the Stopwatch Fixture, an additional 2 ms error will be added with accuracy.
  • Three independent operating modes on one platform — Precision Stopwatch/Timer Calibrator, Frequency/Totalizer to time converter, and RPM Generator for non-contact Tachometer Calibration.
  • 4.3″ Multi colour TFT touchscreen display.
  • Internal High-accuracy 10 MHz OCXO/TCXO time base or External 10 MHz Standard frequency input.
  • Dedicated OCXO/TCXO 10 MHz Isolated output (BNC) as a reference for the external application.
  • Calibration due-date tracking, with last-calibration and due-date storage.

Stop watch Time Mode:
  • Potential-free (dry contact) START / STOP / RESET trigger input from an external source (Calibration Mode), for calibrating the TFC-1901.
  • Front-end START/STOP & RESET provision via touchscreen or mechanical switch for manual triggering application.
  • Pairing input & output in two modes selectable for START/STOP:

    • a. PULSE MODE – 30μs output pulse to START and STOP the timer.

    b. CONTINUOUS MODE – START pulse should be continuously high until press the STOP key; other devices can be controlled the same way.

  • Potential-free (dry contact) Start / Stop / Reset trigger OUTPUT (Master Mode) to simultaneously start, stop, and reset the unit under calibration.
  • Auto-Stop mode (Master Mode only) with a programmable target time and selectable Up / Down counting.
  • Selectable timer/display resolution of Six ranges from 10µs to 1s.
  • Field-adjustable long-run correction — signed, per-hour drift correction applied to the elapsed count.
  • Dedicated external multi-stopwatch fixture support (TFC-19F accessory) — a single trigger output physically actuates up to 5 analog or digital portable stopwatches in parallel for simultaneous UUC calibration to avoid the manual time errors.

Frequency/Totalizer to Time Conversion Mode:
  • This mode of Timer Totalizer can be run from an External Lab frequency standard instead of internal OCXO/TCXO.
  • Fully hardware-based pulse counting in Frequency Totalizer mode — every input pulse is captured directly, so none are ever missed or double-counted, even at the highest input rates.
  • Continuous totalizer run of 24 hours at 100 kHz without rollover (1.728 × 10¹⁰ pulses).
  • 6 decode of measurement resolution for (1s to 10µs) based on the selected input frequency range of (1 Hz to 100KHz) in accordance with DUC resolution.

RPM Generator Mode:
  • RPM Generator with dedicated front-panel LED output.
  • Range from 0 to 204,000 RPM, 50% duty-cycle square wave for Calibrating a non-contact tachometer.
Timer Mode & Frequency Totalizer Mode:
  • Analog Stopwatches
  • Digital Stopwatches
  • Analog Timers
  • Digital Timers
  • Panel Mount Timers
  • Multi-Channel Timers
  • Analog & Digital Quartz Clocks
  • Timer Controllers
  • Autoclave Timers
RPM Generator Mode:
  • Non-contact tachometers and other non-contact RPM measuring instruments.
Accessory — Multi-Stopwatch Fixture – TFC-19F

The TFC-19F is an external fixture for the physical actuation of multiple portable stopwatches during calibration. It connects to a single potential-free trigger output from the TFC-1901 and simultaneously operates the START/STOP mechanism of 1 to 5 analog or digital portable stopwatches, to be calibrated together in a single test cycle.

  • Simultaneously actuates 1 to 5 analog or digital portable stopwatches (UUC).
  • Driven from a single trigger output of START/STOP and RESET pulse from TFC-1901.
  • Reduces calibration time & manual error for batch testing of portable stopwatches.
  • Triggering Speed Accuracy: ±2 ms.
  • Easily Adjustable Mounting Option for Multibrand Stopwatches.
  • BNC connector option is provided to connect the Stopwatch fixture in series.

Standard Accessories
  • Basic Instrument
  • Power card
  • Test Certificate

Optional Accessories
  • Multi-Stopwatch Fixture - TFC-19F
  • Carrying case
  • ISO/IEC 17025 Accredited calibration certificate