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 M (10,000,000 ) 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
k (10,000 ) 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.
14
AC Voltage
88
RANGE AutoHOLD
MIN MAX
REL Hz %
V
A mA A COM
400mA
FUSED
10A MAX
FUSED
88
mV
MIN MAX RANGE AutoHOLD
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