Urrea UD77, Руководство пользователя и гарантия, Страница: 16 / 24

E N G L I S H
16
Volts DC or 750 Volts AC.
NOTE: In some DC and AC voltage ranges
with test leads not connected to any circuits,
the display might show fluctuating readings
due to the high input impedance. This is
normal. When you connect the test leads to
a circuit, a real measurement appears.
Using Holster and Stand.
The Meter comes with a protective holster
that absorbs shocks and protects the
Meter from rough handling. The holster is
equipped with a stand rest.
4. BASIC ELECTRICAL TESTS AND
MEASUREMENTS
4.1 Voltage measuring.
WARNING: TO AVOID THE RISK OF
ELECTRICAL SHOCK AND INSTRUMENT
DAMAGE, INPUT VOLTAGES MUST NOT
EXCEED 1000V DC OR 750V AC (RMS). DO
NOT ATTEMPT TO TAKE AN UNKNOWN
VOLTAGE MEASUREMENT GREATER THAN
1000V DC OR 750V AC (RMS). THIS METER
IS DESIGNED TO WORK WITH WEAK
CURRENT CIRCUITS. DO NOT USE IT FOR
STRONG CURRENT CIRCUITS (POWER LINE
IN FACTORIES AND SO ON HAVING LARGE
CURRENT CAPACITY). USE IN STRONG
CURRENT CIRCUITS IS VERY DANGEROUS
BECAUSE SURGE VOLTAGE IS OFTEN
APPLIED AND IT EXCEEDS THE METER
CAPACITY.
NOTE: When taking voltage measurements,
this Meter must be connected in PARALLEL
with the circuit, or circuit element under
test.
• In 200mV range, displayed value may
fluctuate when disconnecting input
terminals. This is normal.
• AC voltage measuring circuit in this
Meter is of mean value system so an AC
waveform other than a sine wave causes
error.
• To improve the accuracy of DC voltage
measurements taken in the presence of
AC voltages (such as, measuring the DC
offset voltage of an amplifier in the
presence of an AC signal), measure the
AC voltage first. Note the just measured
AC voltage range and select a DC voltage
range. This method improves the DC
voltage accuracy by preventing the input
protection circuits from being activated.
Follow these steps to measure DC (or AC)
Volts:
1. Set function and range switch to the
desired DC V (or AC V) range. If you do
not know the value of the voltage to
measure, always start with the highest
range and reduce the setting as required
to obtain a satisfactory reading.
2. Plug the red test lead into the “VΩ”
input the terminal and the black lead
into the “COM” input terminal of the
instrument.
3. Disconnect the power from the circuit to
be tested.