Continuity Test; Capacitance Measurement - Urrea UD87 Manual De Usuario

E N G L I S H
Tips for measuring resistance
• Because the meter's test current flows
through all possible paths between the
test probe tips, the measured value of a
resistor in a circuit is often different from
the resistor's rated value.
• The test leads can add 0.1 Ω to 0.2 Ω of error
to resistance measurements. To measure
the resistance of the leads, touch the probe
tips together and read the resistance. If nec
essary, you can press the REL∆ button to
automatically subtract this value.
• The resistance function can produce enough
voltage to forward-bias Silicon diode
or transistor junctions, causing them to
conduct. Do not use the 50 MΩ range for
measuring the in-circuit resistance to avoid
this.

Continuity Test

The continuity function detects intermittent
opens and shorts lasting as little as 1
millisecond. These brief contacts cause the
meter to emit a short beep. This function is
convenient for checking wiring connections
and operation of switches. A continuous beep
tone indicates a complete wire.
CAUTION: USING RESISTANCE AND
CONTINUITY FUNCTION IN A LIVE CIRCUIT
WILL PRODUCE FALSE RESULTS AND MAY
DAMAGE THE INSTRUMENT. IN MANY CASES
THE SUSPICIOUS COMPONENTS MUST BE
DISCONNECTED FROM THE CIRCUIT UNDER
TEST TO OBTAIN ACCURATE RESULTS.
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The 1 ms PEAK, MIN/MAX and REL∆ functions
are not available when continuity is selected.
Conductance for High-Resistance Tests
Conductance, the reverse of resistance, is the
ability of a circuit to pass current. High values
of conductance correspond to low values of
resistance. The unit of conductance is the
Siemens (S).

Capacitance Measurement

CAUTION: TO AVOID DAMAGING THE
METER OR THE EQUIPMENT UNDER TEST,
REMOVE ALL POWER FROM THE CIRCUIT
AND DISCHARGE
CAPACITORS BEFORE
CAPACITANCE. LARGE VALUE CAPACITORS
SHOULD BE DISCHARGED THROUGH AN
APPROPRIATE RESISTANCE LOAD. USE THE
DC VOLTAGE FUNCTION TO CONFIRM THAT
THE CAPACITOR IS DISCHARGED.
The available capacitance ranges are 5nF,
50nF, 500nF, 5μF, 50μF, 500μF and 5mF.
Tips for measuring capacitance
• To speed up measurements of similar values,
press RANGE to manually select the proper
range.
• To measure small values of capacitance
accurately, press REL∆ with the test leads
open to subtract the residual capacitance
of the meter and test leads.
Diode ( ) Test
CAUTION: DISCHARGE ALL HIGH-
VOLTAGE CAPACITORS BEFORE TESTING
DIODES. LARGE
SHOULD BE DISCHARGED THROUGH AN
APPROPRIATE RESISTANCE LOAD.
Use the diode test to check diodes, transistors,
ALL HIGH-VOLTAGE
MEASURING
VALUE CAPACITORS