Making Measurements; Measuring Ac And Dc Voltage - Fluke 88 V User Manual

Model 88 V
Users Manual

Making Measurements

The following sections describe how to take
measurements with the Meter.

Measuring AC and DC Voltage

The Meter's voltage ranges are 600.0 mV, 6.000 V,
60.00 V, 600.0 V, and 1000 V. To select the 600.0 mV dc
range, turn the rotary switch to mV. To measure ac or dc
voltage, refer to Figure 2.
When measuring 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.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
14
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AC Voltage
88
MIN MAX RANGE AutoHOLD
REL Hz %
V
A mA A COM
400mA
FUSED
10A MAX
FUSED
88
mV
AutoHOLD
MIN MAX RANGE
REL Hz %
V
A mA A COM
400mA
FUSED
10A MAX
FUSED
Figure 2. Measuring AC and DC Voltage
Switch Box
DC Voltage
+
aug01f.eps