How to Read Timegrapher QC Numbers

The most confusing part of watch Quality Control (QC) is the timegrapher test. Dealers will show a video of a machine with flashing numbers and wave lines. In this guide, we break down exactly what these numbers mean and how to read them like a professional watchmaker.

What is a Timegrapher?

A timegrapher is an electronic diagnostic tool equipped with a sensitive microphone. It listens to the internal "tick-tock" beat of the mechanical movement's escapement wheel and balance wheel. By measuring the micro-timing of these beats, it calculates the accuracy, health, and power delivery of the movement.

The 3 Key Metrics Explained

1. Daily Rate (e.g., +4 s/d)

This is the number of seconds the watch will gain (+) or lose (-) over a full 24-hour period.

• Excellent: 0 to +5 s/d
• Acceptable: -5 to +12 s/d (Even genuine Rolex watches can shift by a few seconds depending on temperature and position).
• Reject: Greater than +/- 15 s/d. If we see this during TimeMax QC, we automatically send the watch to our watchmaker for fine regulation before shipping.

2. Amplitude (e.g., 285°)

Amplitude is the angle of rotation that the balance wheel swings in each direction. It is the absolute best indicator of a movement's power and health.

• Healthy: 250° to 310° (Indicates a strong mainspring and clean, lubricated pivots).
• Acceptable: 220° to 249° (Perfect for brand new movements that haven't been worn or fully wound yet).
• Reject: Below 200° (Indicates a weak mainspring, dried oils, or internal friction. The movement needs servicing).

3. Beat Error (e.g., 0.1 ms)

Beat error measures the difference in time between the "tick" and the "tock." In a perfect movement, the balance wheel should swing exactly the same distance to the left as it does to the right.

• Excellent: 0.0 ms to 0.2 ms
• Acceptable: 0.3 ms to 0.6 ms
• Reject: 0.8 ms or higher (Indicates the hairspring is off-center or the pallet fork is misaligned. Can lead to sudden movement stops).

Additional Metric: Lift Angle and Frequency

You will also see a small number like 52.0° (Lift Angle) and 28,800 bph (Beats Per Hour). These are static settings for the machine. Most modern clone movements (like the VS3235 and VR3135) beat at 28,800 bph (8 ticks per second), giving the second hand its iconic, buttery smooth sweep.

Summary: Rest Easy with TimeMax

When you receive your QC video from TimeMax, look at the timegrapher screen. If the daily rate is within single digits, amplitude is above 250°, and beat error is under 0.5 ms, your clone movement is in **pristine mechanical health** and ready for years of reliable wear.