19
4.11 AC Voltage Measurement 0-2.5 ~ 0-250V Range
!
Branch and distribution circuits (120/240/480V etc.) can deliver dan-
gerous explosive power momentarily into a short circuit before the
fuse/breaker opens the circuit. Make absolutely certain that the In-
strument switches are set properly, jacks are connected properly, and
that the circuit power is turned off before making connections to such
circuits.
The 260 responds to the average value of an AC waveform. It is calibrated in
terms of the RMS value of a pure sine wave. If the waveform is nonsinusoidal, and
depending upon its waveform, the reading may be either higher or lower than the
true RMS value of the measured voltage. Thus an error may be introduced if the
260 is used to measure a nonsinusoidal waveform. Also, accuracy is lessened at
higher input frequencies (Figure 4-4).
Before proceeding with the following steps, review the Safety Precautions in Para-
graph 4.2.
a. Set the function switch to AC Volts Only position (Figure 4-5).
NOTE: The meter will not indicate if the switch is incorrectly set to a DC position.
b. Set the range switch at one of the five voltage range positions marked 2.5V,
10V, 25V, 50V or 250V. (When in doubt as to actual voltage present, always
use the highest voltage range as a protection to the Instrument. If the voltage
is within a lower range, the switch may be set for the lower range to obtain a
more accurate reading.)
2.5 V.
10 V.
1V.
25 V.
50 A.
AMPS.
250 V.
500 V.
I000 V.
ZERO OHMS
COMMON
-
A.C. VOLTS
ONLY
A.C
.
A.C.
260
ALL TERMINALS 1 V MAX
500 V.
A.C. D.C.
50
2.5 V.
10 V.
1V.
25 V.
50 A.
AMPS.
250 V.
500 V.
I000 V.
ZERO OHMS
COMMON
-
A.C. VOLTS
ONLY
A.C.
A.C.
260
ALL TERMINALS 1 V MAX
500 V.
A.C. D.C.
10
FIGURE 4-6. Jacks and Switch Positions
for Measuring AC Voltage 0-2.5 Through
0-250V Ranges
FIGURE 4-7. Jacks and Switch
Positions for Measuring AC Voltage 0
Through 1000V Range
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