Sanwa EM7000, Instruction Manual, Page: 43 / 68

DRAWING No.EM7000 09-1306 2040 2040
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6-4-3 ACV (ACV rms) Maximum measurable voltage AC 750 V
1) Objects of measurement
Voltages of sine wave alternating current such as lamp line
circuits converted to root-mean-square (rms) values.
2) Measuring ranges (6 ranges)
3/12/30/120/300/750 V
3) Measurement procedure
Insert the red plug of
test leads into the
+input terminal, and the
black plug into the
–COM terminal.
Turn the function/range
selector to the appropriate
ACV rms range.
Turn on the power switch
(power ON: Lamp blinks).
Turn the electrical zero adjuster (ZERO ADJ) to adjust the
pointer to the zero position of red ACV (rms) scales.
Apply the red and black test pins to two measuring points
(parallel connection to the load). In the case of alternating
current, the polarity of test leads may be ignored.
Read the meter indication on red ACV (rms) scales in a unit of
V (volt). The figures are black figures common to DCV.
Detach the test pins from the circuit to be measured.
Turn off the power switch (power OFF: Lamp blinking goes off).
The AC function of this unit uses the p-p rectifying system
that indicates the value between positive and negative peak
values of sine wave alternating current (p-p value) by
converting into the root-mean-square value.
Accordingly, the correct rms value is indicated for the sine
wave AC, but an indication error will occur according to
waveforms in AC voltage measurement of waveforms other
than sine wave AC.
Even for the voltage of two waveforms having the same rms
value, different values will be indicated if the voltage between
positive and negative peak values are different. On the
contrary, for the voltage of two waveforms having different rms
values, the same value will be indicated if the voltage between
positive and negative peak values are the same.
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Outlet
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