Fluke 87 III - Manual (Page 28)

80 Series III
Users Manual
20
•
To estimate capacitance values above 5
µ
F, use the
current supplied by the meter’s resistance function,
as follows:
1. Set up the meter to measure resistance.
2. Press K to 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
µ
F/second of Charge
Time column in 6. The result is the estimated
capacitance value in microfarads (
µ
F).
Table 6. Estimating Capacitance Values Over
5 Microfarads
Expected Capacitance
Suggested
Range*
µ
F/second
of Charge
Time
Up to 10
µ
F 4 M
e
0.3
11
µ
F to 100
µ
F 400 k
e
3
101
µ
F to 1000
µ
F 40 k e 30
1001
µ
F to 10,000
µ
F 4 k e 300
10,000
µ
F to 100,000
µ
F 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.