Timegrapher Readings Explained: Amplitude, Beat Error & What’s Normal

Quick Answer

A timegrapher mainly shows three numbers:

Rate (seconds per day): how fast/slow the watch runs
Amplitude (degrees): how strong the balance wheel swings (movement “health/energy”)
Beat Error (ms): how evenly the tick and tock are spaced

If your readings look “bad,” don’t panic—many issues come from low wind or magnetism, not immediate failure.

Set your watch precisely before testing:
→ Hacking Seconds Explained: How to Set Time Precisely (and When It Matters)

1) What a timegrapher measures (plain English)

A timegrapher “listens” to the watch and estimates:

how consistently it ticks
how strongly the balance is swinging
whether tick and tock are symmetrical

It’s a useful diagnostic tool—but it does not replace real-world wear testing.

2) The 3 key numbers (and what they mean)

A) Rate (s/day)

+10 s/day means it gains 10 seconds in 24 hours
−10 s/day means it loses 10 seconds in 24 hours

If you’re trying to understand why your watch runs fast or slow, start here:
→ Why Is My Watch Running Fast or Slow? 9 Common Causes (And Fixes)

B) Amplitude (°)

Amplitude is the balance wheel’s swing angle. Think of it as “how much energy is reaching the balance.”

Higher amplitude usually means healthier power delivery
Low amplitude can mean low wind, friction, or service needs

C) Beat Error (ms)

Beat error describes how evenly spaced the tick and tock are.

Smaller is better
Big beat error can indicate the watch is “out of beat” (adjustment issue), not necessarily worn out

3) What’s “normal”? (quick ranges)

These are practical ranges for many modern mechanical watches. Your model can differ.

Quick table

Metric	Good / Normal	Caution	Often Needs Attention
Rate	within a few seconds/day to ~±10 s/day (depends on expectations)	±10–20 s/day	large or unstable swings
Amplitude (dial up/down)	~250°–320°	~220°–250°	< ~220° consistently
Beat error	~0.0–0.6 ms	~0.6–1.0 ms	> ~1.0 ms

Important: amplitude depends on factors like wind level, position, and lift angle (see below).

Accuracy standards context (COSC vs METAS):
→ Watch Accuracy Standards Explained: COSC vs METAS (What the Numbers Really Mean)

4) Before you trust the numbers: 3 setup checks

Check 1 — Fully wind the watch

Low wind = low amplitude.
Winding guide:
→ How to Wind a Mechanical Watch Properly (Manual vs Automatic + Mistakes to Avoid)

If your watch stops early, read:
→Power Reserve Explained: Why Your Watch Stops Early (and How to Fix It)

Check 2 — Magnetism

Magnetism can cause odd rate behavior and instability.

Symptoms:
→ Magnetized Watch Symptoms: Why Your Watch Runs Fast & How to Fix It (Safely)

At-home demagnetizing:
→ How to Demagnetize a Watch at Home (Tool, Steps & When to Stop)

Check 3 — Lift angle (if your timegrapher requires it)

Wrong lift angle can make amplitude look “wrong.”
If you don’t know it, use the manufacturer info if possible (many users start with common defaults, but accuracy varies).

5) What low amplitude usually means (and what to do)

If amplitude is low but rate is stable:

Most common causes:

not fully wound (automatic worn lightly)
friction from old oils / dirty movement
mainspring or winding efficiency issues

What to try first:

fully wind and re-test
test in multiple positions (dial up, dial down)
demagnetize if rate is erratic

If it stays low after proper winding, consider service:
→ How Often Should You Service a Mechanical Watch? A Practical Maintenance Timeline

6) What high beat error means

High beat error often means the movement is out of beat (adjustment issue). It can run “okay” but it’s not ideal long-term.

When to stop DIY:

beat error stays high across positions
rate becomes unstable
you also have low amplitude

Service reference:
→ How Often Should You Service a Mechanical Watch? A Practical Maintenance Timeline

7) A simple “home test plan” (fast, practical)

Step 4 — Compare with real wear over 2–3 days

If timegrapher looks OK but real wear is bad, position and lifestyle are often the cause:
→ Why Is My Watch Running Fast or Slow? 9 Common Causes (And Fixes)

8) When a timegrapher points to servicing

Consider service if:

amplitude remains low even fully wound
beat error is consistently high
rate is unstable across positions
the watch used to be better and suddenly changed

Service guide:
→ How Often Should You Service a Mechanical Watch? A Practical Maintenance Timeline

FAQ

1) What is a normal amplitude for a mechanical watch?

Often ~250°–320° dial up/down, but it varies by movement and lift angle.

2) What is a good beat error?

Many people aim under ~0.6 ms; under 1.0 ms is often acceptable depending on the watch.

3) My amplitude is low—does it always need service?

Not always. First ensure the watch is fully wound and magnetism is ruled out.

4) Does magnetism change timegrapher readings?

Yes—magnetism can cause fast running and instability.
→ Magnetized Watch Symptoms: Why Your Watch Runs Fast & How to Fix It (Safely)

5) Why does rate change by position?

Gravity affects friction and balance behavior; mechanical watches often vary by position.

6) How do I compare before/after demagnetizing?

Take a reading, demagnetize, then re-test under the same conditions.
→ How to Demagnetize a Watch at Home (Tool, Steps & When to Stop)