Precision Timer / Stopwatch Calibrator
Model: TFC 1901
Digital Electronic Stopwatch : 100 msto 86400.00000 s
Display : 4.3″ Multi colour TFT touchscreen display.
- 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.
Built with a internal 10MHz OCXO/TCXO time base Oscillator or External input option from Rubidium / GPS-Disciplined Oscillator / Frequency 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.
| TIME BASE OPTIONS | ||
|---|---|---|
| Parameter | TFC 1901-01 | TFC 1901-02 |
| Time Base Type | TCXO | OCXO |
| Uncertainty Due To | ||
| Aging per day | ±2.7 × 10⁻⁹ | ±0.2 × 10⁻⁹ |
| Aging per month | ±0.1 × 10⁻⁶ | ±6 × 10⁻⁹ |
| Aging per year | ±1 × 10⁻⁶ | ±5 × 10⁻⁸ |
| Temperature variations (0 to 50°C) | ±2.5 × 10⁻⁶ | ±0.5 × 10⁻⁹ |
| Temperature variations (25°C ± 2°C) | ±0.1 × 10⁻⁶ | ±0.1 × 10⁻⁹ |
| Short-term Stability (1 s to 100 s) | Not specified | ±5 × 10⁻⁹ |
| Supply Voltage Stability | ±0.2 × 10⁻⁶ | ±0.5 × 10⁻⁹ |
| Frequency Calibration (at 25°C ± 2°C) | ±1 × 10⁻⁶ | ±50 × 10⁻⁹ |
| General | ||
|---|---|---|
| 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 | ||
| 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 + 3 ms) TCXO: ±(1.003 × 10⁻⁶ × Te + 3 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 | ||
| 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. | |
| Input / Counting | Dedicated pulse-count input, standard logic-level pulse train; fully hardware-based counting —no missed/double-counted pulses even at highest rates | |
| Mode 3 — RPM Generator | ||
| Range for Non-contact | 0 to 204,000 RPM. | |
| Output / Conversion | Front-panel LED output, 50% duty-cycle square wave; f (Hz) = RPM / 60. | |
| Accuracy | 0.01% of rdg+ 1 rpm | |
1. Due to continuous improvement, published specifications may change without notice.
2. **If we use the Stopwatch Fixture, an additional 3 ms error will be added with accuracy.
3. The above accuracy specifications are based on the internal oscillator only. Accuracy may vary when using the external Rubidium / GPS-disciplined oscillator input option.
Three modes on one platform — Precision Stopwatch/Timer Calibrator, Frequency/Totalizer to time converter, and RPM Generator.- 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.
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.- 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.
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
- Timer Controllers
- Autoclave Timers
- Non-contact Tachometers & other RPM Meters
RPM Generator Mode:
- Non-contact tachometers and other non-contact RPM measuring instruments.
Analog Stopwatches Digital Stopwatches Analog Timers Digital Timers Panel Mount Timers Multi-Channel Timers Timer Controllers Autoclave Timers Non-contact Tachometers & other RPM Meters- 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: ±3 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
