Fluke 87 III Manual do Utilizador descarregar pdf (Página 28)

80 Series III

Users Manual

• To estimate capacitance values above 5 µF, use the

current supplied by the meter’s resistance function,

as follows:

1. Set up the meter to measure resistance.

2. Press Kto select a range based on the

value of capacitance you expect to measure

(refer to Table 6.)

3. Discharge the capacitor.

4. Place the meter’s leads across the capacitor;

then time how long it takes for the display to

reach OL.

5. Multiply the charge time from step 4 by the

appropriate value in the µF/second of Charge

Time column in 6. The result is the estimated

capacitance value in microfarads (µF).

Table 6. Estimating Capacitance Values Over

5 Microfarads

Expected Capacitance

Suggested

Range*

µF/second

of Charge

Time

Up to 10 µF4 Me 0.3

11 µF to 100 µF 400 ke 3

101 µF to 1000 µF 40 ke 30

1001 µF to 10,000 µF4 ke 300

10,000 µF to 100,000 µF 400 e 3000

*These ranges keep the full-charge time between 3.7 seconds

and 33.3 seconds for the expected capacitance values. If the

capacitor charges too quickly for you to time, select the next

higher resistance range.

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Fluke 87 III Manual do Utilizador Página 28