UNI-T UT58D Operating Manual page 2

P/N:110401104225
voltages higher than 60V DC or 30V rms in AC.
Testing Diodes
Use the diode test to check diodes, transistors, and other
semiconductor devices. The diode test sends a current
through the semiconductor junction, and then measures
the voltage drop across the junction. A good silicon
junction drops between 0.5V and 0.8V.
To test out a diode out of a circuit, connect the Meter as
follows:
2. Set the rotary switch to .
3. For forward voltage drop readings on any semiconductor
component, place the red test lead on the component's
anode and the black test lead on the component's
cathode.
The measured value shows on the display.
Note
Testing for Continuity
To test for continuity, connect the Meter as below:
1. Insert the red test lead into V terminal and the black
test lead into the COM terminal.
2. Set the rotary switch to .
3. Connect the test leads across with the object being
measured.
4. The buzzer sounds if the resistance of a circuit under
test is <70 .
The tested circuit resistance value simultaneously
shows on the display and the unit is .
Note
When continuity testing has been completed,
disconnect the connection between the testing leads
and the circuit under test, and remove the testing
leads away from the input terminal of the Meter.
E. Measuring Inductance (See Figure 7)
( Figure 7)
Warning
Make sure the tested inductance is far away from the
high electromagnetic field so as to to obtain accur
-ate reading.
The inductance ranges : 2mH, 20mH, 200mH and 20H.
To test for Inductance, connect the Meter as below:
1. According to the size of the tested object's leads,
insert multi-purpose socket or test clip into the mA
and V terminal.
2. Set the rotary switch to an appropriate measurement
position in HLx range.
3. Insert the tested object into the corresponding jack
of the multi-purpose socket or connect the test clip
to the object being measured.
The measured value shows on the display.
disconn
-ect tested objects from multi-purpose socket or test
clip,
F. Measuring Capacitance (See Figure 8)
( Figure 8)
Warning
To avoid damage to the Meter or to the equipment
under test, disconnect circuit power and discharge
all high-voltage capacitors before measuring
capacitance.Use the DC voltage function to confirm
that the capacitor is discharged.
To avoid harms to you, never attempt to input voltages
higher than 60V DC or 30V rms in AC.
The capacitance ranges:
To measure capacitance, connect the Meter as follows:
1. According to the size of the tested object's leads, select
multi-purpose socket or test clip to insert into the mA
and V terminal.
2. Set the rotary switch to an appropriate measurement
position in Fcx range.
3. Insert the tested object into the corresponding jack of
he multi-purpose socket or connect the test clip to
he object being measured.
The measured value shows on the display.
Note
If the value of capacitance to be measured is unknown ,
use the maximum measurement position, and reduce
the range step by step until a satisfactory reading is
obtained.
When the tested capacitor is shorted or the capacitor
value is overloaded, the LCD display "1".
To minimize the measurement error caused by the
distributed capacitance, the testing lead should be
as short as possible.
To increase accuracy especially when measuring
small capacitance range 20nF, subtract the test leads'
open-circuit value from the display reading.
It is normal to take a longer time when testing a high
capacitor value.
For testing the capacitor with polarity, connect the
" "
red clip or red test lead to anode and black clip or
black test lead to cathode.
When capacitance testing has been completed,
remove the testing leads away from the multi-purpose
socket, and remove multi-purpose socket or test clip
away from the input terminal of the Meter.
(See Figure 9)
( Figure 9)
-
Sleep Mode
To preserve battery life, the Meter automatically turns
off if you do not turn the rotary switch or press any
button for around 15 minutes. When the Meter is under
sleep mode, it consumes 10 μA current.
To activate the Meter, press POWER for two times.
Operation of Hold Mode
Warning
To avoid possibility of electric shock, do not use Hold
mode to determine if circuits are without power. The
Hold mode will not capture unstable or noisy readings .
" "
" "
" "
Continuous
sounds
Remarks:
The tested inductance: Q 10, Internal resistance
1.3k.
When the tested inductance is >1H, the obtained
reading is only for reference.
The displayed
value is hFE
approx. value of
tested transistor
(0~ )
Maintenance
This section provides basic maintenance information
including battery and fuse replacement instruction.
Warning
Do not attempt to repair or service your Meter unless
you are qualified to do so and have the relevant
calibration, performance test, and service information.
To avoid electrical shock or damage to the Meter, do
not get water inside the case.
A. General Service
Periodically wipe the case with damp cloth and mild
detergent. Do not use chemical solvent.
To clean the terminals with cotton bar with detergent,
as dirt or moisture in the terminals can affect readings.
Turn the Meter off when it is not in use and take out
the battery when not using for a long time.
Do not store the Meter in place of humidity, high
temperature, explosive, inflammable and strong
magnetic field
B. Replacing the Fuses
(See Figure 10)
Battery
Holster
Screw
( Figure 10) Fuse
(See Figure 10)
4. Remove the battery from the battery connector.
5. Replace with a new 9V battery (NEDA1604, 6F22 or
006P).
6. Rejoin the case bottom and case top, and reinstall the
3 screws and the holster.
** END **
This operating manual is subject to change without notice.
Copyright 2001 Uni-Trend Group Limited.
All rights reserved.