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Making Measurements
13
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
H
HzREL
mA
A
mV
V
V
OFF
!
!
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µA
CAT II
V
87
TRUE RMS MULTIMETER
MIN MAX RANGE HOLD
H
HzREL
mA
A
mV
V
V
OFF
!
!
A COM
V
mA µA
A COM
V
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
V
+
AC Voltage
DC Voltage
III
87
TRUE RMS MULTIMETER
III
iy2f.eps
Figure 2. Measuring AC and DC Voltage