Urrea UD112 Manual De Usuario página 21

button momentarily to select AC.
Range available in volts functions are :
400 mV, 4 V, 40 V, 400 V, and 1000V.
When measuring voltage, the meter acts like
a 10Ω (10 x 10Ω) 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 or less.
Tips for measuring voltage
• In 400 mV range, displayed value may
fluctuate when
terminals. This is normal.
• AC voltage measuring circuit in Model
UD179 is root-mean-square (True RMS)
value system so the meter can accurately
measure AC voltage of non-sinusoidal
waveforms including harmonics caused by
various non-linear loads.
• To improve the accuracy of DC voltage
measurements taken in the presence of
AC voltages (such as, measuring the DC
voltage of an amplifier in the presence
of an AC signal), measure the AC voltage
first.
disconnecting input
NOTE: The just measured AC voltage range and
select a DC voltage range that is the same or higher
than the AC voltage range. This method improves
the DC voltage accuracy by preventing the input
protection circuits from being activated.
WARNING: TO AVOID THE RISK OF ELECTRICAL
SHOCK AND INSTRUMENT DAMAGE, INPUT
VOLTAGES MUST NOT EXCEED 1000 V DC OR AC
(RMS). DO NOT ATTEMPT TO TAKE ANY UNKNOWN
VOLTAGE MEASUREMENT THAT MAY BE IN EXCESS
OF 1000 V DC OR AC (RMS).
Resistance Measurement (Ω,
(Resistance, Diode, and Continuity)
CAUTION: TO AVOID DAMAGING THE METER
OR THE EQUIPMENT UNDER TEST, REMOVE ALL
POWER FROM THE CIRCUIT AND DISCHARGE ALL
HIGH-VOLTAGE CAPACITORS BEFORE MEASURING
RESISTANCE.
E N G L I S H
, )
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