Tachometer: Testing and Inspection

1. Connect a flux-type engine speedometer.
2. Compare the readings of the engine speedometer and the tachometer at every engine speed, and check if the variations are within the standard values.
Standard values:
<8,000 r/min display tachometer>
Engine speed Indicated variation
1,000 ±100 r/min
3,000 ±150 r/min
5,000 ±250 r/min
6,000 ±300 r/min

<9,000 r/min display tachometer>
Engine speed Indicated variation
700 ±70 r/min
3,000 +220/-110 r/min
5,000 +300/-100 r/min
7,000 +350/-50 r/min