18
charged. Connect the black test lead to the negative side of the circuit being
measured and the red test lead to the positive side of the circuit.
e.
Turn on power in circuit being measured.
f.
Read the voltage using the 0-50 figures on the black scale marked DC.
Multiple the reading by 10.
NOTE:
Turn off power to the circuit and wait until the meter indicates zero before
disconnecting the test leads.
4.5.5 DC Voltage Measurement 0-1000V Range
Use extreme care when working with high voltage circuits. Do not touch the
Instrument or test leads while power is on in the circuit being measured.
Before proceeding with the following steps, review the Safety Precautions in
Paragraph 4.1.
a.
Set the function switch at +DC (Figure
4-4).
b.
Set the range switch at the 250V/500V/
1000V Position.
c.
Plug the black test lead into the -COM-
MON jack and the red test lead into
the 1000V jack.
d.
Be sure power is off in the circuit be-
ing measured and all capacitors dis-
charged. Connect the black test lead
to the negative side of the circuit be-
ing measured and the red test lead to
the positive side of the circuit.
e.
Turn on power in circuit being mea-
sured.
f.
Read the voltage using the 0-10 fig-
ures on the black scale marked DC.
Multiple the reading by 100.
NOTE:
Turn off power to the circuit and wait
until the meter indicates zero before
disconnecting the test leads.
4.6
AC Voltage Measurement
Branch and distribution circuits (120/240/480V etc.) can deliver dangerous ex-
plosive power momentarily into a short circuit before the fuse/breaker opens the
circuit. Make certain that the Instrument switches are set properly, jacks are con-
nected properly, and that the circuit power is turned off before making connec-
tions 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
!
Figure 4-4 Jacks and Switch
Positions for Measuring DC
Voltages, 0-1000V Range
D.C
.
D.C
.
250 V.
500 V.
I000 V.
COMMON
-
- D.C.
+ D.C.
260
ALL TERMINALS 1 V MAX
1000 V.
A.C. D.C.
!
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