Fluke 87 III Manuel d'utilisateur télécharger pdf (Page 21)

Making Measurements

The following are some tips for measuring voltage:

• When you measure voltage, the meter acts

approximately like a 10 MΩ (10,000,000 Ω)

impedance in parallel with the circuit. This loading

effect can cause measurement errors in high-

impedance circuits. In most cases, the error is

negligible (0.1% or less) if the circuit impedance is

10 kΩ (10,000 Ω) or less.

• For better accuracy when measuring the dc offset of

an ac voltage, measure the ac voltage first. Note the

ac voltage range, then manually select a dc voltage

range equal to or higher than the ac range. This

procedure improves the accuracy of the dc

measurement by ensuring that the input protection

circuits are not activated.

MIN MAX RANGE HOLD

HzREL

OFF

1000V MAX

400mA MAX

FUSED

10A MAX

FUSED

PEAK MIN MAX

µA

CAT II

TRUE RMS MULTIMETER

MIN MAX RANGE HOLD

HzREL

OFF

A COM

mA µA

A COM

mA µA

1000V MAX

400mA MAX

FUSED

10A MAX

FUSED

PEAK MIN MAX

41/2 DIGITS

1 Second

41/2 DIGITS

1 Second

µA

CAT II

Switch Box

AC Voltage

DC Voltage

III

TRUE RMS MULTIMETER

III

iy2f.eps

Figure 2. Measuring AC and DC Voltage

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 57 58

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Fluke 87 III Manuel d'utilisateur Page 21

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