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Timegrapher reading context: what do rate, amplitude and beat error actually tell me? · RWI-01839

Thread starter BenchNotes 05581
Start date 21/07/18
Replies 4

BenchNotes 05581

Member

Thread starter

21/07/18

I ran a watch on a basic timegrapher and got +6 s/d, 245 degrees amplitude and 0.8 ms beat error, dial up, about an hour after winding. Is this good, bad or normal? I don't want to send it for service on a single reading.

Reply scope: address the opening question, explain the supporting record or reasoning, and state the limit of the answer.

CaliberReader 05582

Member

21/07/18

First identify the caliber, lift-angle setting, winding state and measurement position. Without those fields, the rate, amplitude and beat-error values lack enough context for a useful comparison.

DialCheck 05584

Member

21/07/18

Amplitude depends on the movement and measurement setup. Compare it with appropriate specifications and a qualified watchmaker’s assessment; a universal pass/fail threshold would be misleading.

CaseFile 05583

Member

21/07/18

Can the same settings and winding state be used for several positions? Record each position separately rather than combining measurements taken under different conditions.

MovementIndex 05585

Member

21/07/18

The lift angle must match the movement specification for the amplitude reading to be meaningful. If it is unknown, label amplitude as provisional instead of accepting the instrument default.

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