Tachometer Reading Jumps Around - Moderated Discussion Areas

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Author Topic:   Tachometer Reading Jumps Around

hoskings posted 05-27-2007 11:06 AM ET (US)
[Describes his tachometer readings as changing suddenly.]
jimh posted 05-27-2007 04:22 PM ET (US)
Check the calibration control on the tachometer. Usually there is a switch to select the proper number of poles in the alternator supplying the signal to the tachometer. Perform this procedure:
Tachometer Calibration Control Cleaning
--make a note of the current position of the tachometer calibration control
--using an appropriately sized screwdriver, move the tachometer calibration control setting back and forth throughout its full range of adjustment, repeating this several times
--return the calibration control setting to the original position noted above

This should clean off the contacts in the calibration control setting switch. This often restores proper operation to the tachometer.
If this procedure does not fix the problem, let us know and we will offer additional suggestions.
hoskings posted 05-28-2007 02:55 AM ET (US)
Many thanks. [Says he will perform the procedure to restore the tachometer calibration when the weather permits.]

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Author	Topic: Tachometer Reading Jumps Around
hoskings	posted 05-27-2007 11:06 AM ET (US) [Describes his tachometer readings as changing suddenly.]
jimh	posted 05-27-2007 04:22 PM ET (US) Check the calibration control on the tachometer. Usually there is a switch to select the proper number of poles in the alternator supplying the signal to the tachometer. Perform this procedure: Tachometer Calibration Control Cleaning --make a note of the current position of the tachometer calibration control --using an appropriately sized screwdriver, move the tachometer calibration control setting back and forth throughout its full range of adjustment, repeating this several times --return the calibration control setting to the original position noted above This should clean off the contacts in the calibration control setting switch. This often restores proper operation to the tachometer. If this procedure does not fix the problem, let us know and we will offer additional suggestions.
hoskings	posted 05-28-2007 02:55 AM ET (US) Many thanks. [Says he will perform the procedure to restore the tachometer calibration when the weather permits.]