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Are you measuring the resistors in circuit? If so, you'll get other circuit components in the mix.
If you are measuring resistance with the Fluke, manually select the resistance range, as the "hunt" current source can induce small (.5% or less) errors. From the 70 series on up, Fluke has always stated that you should use manual stepping/selection of the resistance ranges if measuring a known resistance. It's how Fluke measures resistance in the combined diode junction/resistance mode - they flow a small current through the leads, and through the unknown component. The current flow induces a voltage drop which is either directly or indirectly measured - directly for diodes, and indirectly for resistances. The meter will step through the ranges, hunting for a value of 1.00 plus (thus you don't get odd measurements like .900 kohms, but a value of 900 ohms.) This hunting will cause undesired current fluctuations as the meter hunts. Manually selecting the range stops the stepping and the undesired fluctuations. Probably not a big deal in your application, but could be in others...
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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