Simpson 260-6LPM, Инструкция по эксплуатации, Страница: 16 / 24

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c. Set the range switch to one of the seven voltage range positions marked 1V,
2.5V, 10V, 100V, 250V or 500V. When in doubt about the approximate voltage
present, always use a sufficiently high voltage range to protect the Instru-
ment. If the voltage reading is within the limits of a lower range, the switch
then may be set to that range to obtain a more accurate reading.
d. Be sure the power is off in the circuit being measured and all the capacitors
have been discharged.
e. Connect the black test lead to the negative side of the circuit being measured
and red test lead to the positive side of the circuit.
f. Turn on the power of the circuit and read the voltage of the black scale marked
DC. For the 2.5V and 25V ranges, use the 0-250 figures and divide the read-
ing by 100 and 10 respectively. For the 10V and 250V ranges, read the 0-10
and 0-250 figures directly. For the 500V range, use the 0-50 figures and
multiply the reading by 10. For the 100V range use the 0-10 figures and
multiply by 10. For the 1V range, use the 0-10 figures and divide by 10.
g. Turn the power off, disconnect test leads and return the range switch to the
OFF/TRANSIT position.
4.6.3 Measuring DC Voltage: 0-1000V
Use extreme care when working with high voltage circuits. For maximum safety,
avoid touching the Instrument or test leads while power is on in the circuit being
measured.
a.
Set the function switch to +DC.
b. Set the range switch to 1000V (dual position with 500V).
c. Be sure the power is off in the circuit being measured and all capacitors have
been discharged.
d. Plug the black test lead into the –COMMON jack and the red test lead into the
1000V jack. Connect the black test lead to the negative side of the circuit
being measured and the red test lead to the positive side.
e. Turn on power in the circuit being measured.
f. Read the voltage on the black scale marked DC, using the 0-10 figures. Mul-
tiply the reading by 100.
4.7 AC Voltage Measurement
Prior to making voltage measurements, review the SAFETY PRECAUTIONS listed
in paragraph 4.2.
4.7.1 Measuring AC Voltage
NOTE: The Simpson 260-6XLPM responds to the full wave 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, the reading might be either higher or lower than the
true RMS value and could result in a substantial error. Also, accuracy is lessened
at higher input frequencies (Figure 4-1).
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