Diode Test & Microwave Diodes - Urrea UD77 Manual De Usuario Y Garantía

E N G L I S H
and to ensure a correct measurement,
NEVER CONNECT THE TEST LEADS TO A
SOURCE OF VOLTAGE when the rotary
switch is set to Ω or (
• The current applied during resistance
measurements
devices. The table below lists the test
voltage and current available for each
resistance measurement range. (All values
are typical).
NOTE: (A) is the open circuit test voltage
at the input terminals in Volts. (B) is the
voltage drop across a resistance equal to full
scale value. (C) is the current through a short
circuit at the input terminals.
RANGE OPEN CIRCUIT
VOLTAGE (A)
200 Ω
2 KΩ
20 KΩ
< 1,2 V
200 KΩ
2 MΩ
20 MΩ
4.2.1 Measuring resistance.
When measuring resistance, make sure that
the contact between the test leads and the
circuit under test leads is good. Dirt, oil,
solder flux or other foreign matter seriously
affect the read value.
Follow these steps to measure resistance:
1. Set the function switch to the desired
"Ω" position.
2. Insert the black test lead into the "COM"
input terminal and the red test lead into
the "VΩ" input terminal.
3. Connect the test leads to the circuit to
be measured.
4. The measured
18
) functions.
could damage
FULL SCALE SHORT CIRCUIT
VOLTAGE (B) CURRENT (C)
< 150 mV < 695 µA
< 550 mV < 470 µA
< 700 mV < 95 µA
< 750 mV < 10,5 µA
< 800 mV < 1,1 µA
< 800 mV < 0,2 µA
resistance will
displayed on the LCD.
4.2.2 Continuity Test.
This mode helps you checking electrical
circuits, such as wiring, speaker cables,
some
connections, switchers, or relays for short or
open circuits. In continuity test, a measured
value of approx. 150Ω or less causes the
Meter to emit a continuous tone.
Follow these steps to check continuity:
1. Set the Function switch to the " "
position.
2. Insert the black test lead into de "COM"
input terminal and the red test lead into
the "VΩ" input terminal.
3. Connect the test leads to the circuit to
be measured.
4. This Meter will emit a continuous tone
for resistances of less than 150 Ohms.
4.3 Diode test & microwave diodes.
Diode test lets you checking diodes,
transistors and other semiconductors for
opens, shorts and normal operation. NEVER
CONNECT THE TEST LEADS TO A SOURCE OF
VOLTAGE when rotary switch is set to "
In diode test. Drop voltage in the forward
direction is displayed when diode is
connected in this mode. For a Germanium
diode, the typical forward voltage is about
0.4V and in case of a Silicon diode , about
0.6V.
Judge the semiconductor device as follows:
If the digital reading in one direction shows
a value and the reading in reverse direction
shows an overload "
be
good. If the digital reading is the same
".
" the device is