Fluke 87 V - Manual (Page 22)

80 Series V
Users Manual
14
When measuring voltage, the Meter acts approximately
like a 10 M
Ω (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 k
Ω (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
REL Hz %
AutoHOLD
Peak MIN MAX
4½ DIGITS 1 Second
˚ C/ ˚ F
OFF
mA A
mV
V
V A
A mA COM V
400mA
FUSED 10A MAX FUSED
A
TRUE RMS MULTIMETER 87 V
LO LO
MIN MAX RANGE
REL Hz %
AutoHOLD
Peak MIN MAX
4½ DIGITS 1 Second
˚ C/ ˚ F
OFF
mA
A
mV
V
V A
A mA COM V
400mA
FUSED 10A MAX FUSED
A
TRUE RMS MULTIMETER 87 V
LO LO
Switch Box
V
+
AC Voltage
DC Voltage
V
mV
aom2f.eps
Figure 2. Measuring AC and DC Voltage