Emos MD-420, Manual

Page: 6 / 72

6
Capacity Measurement
1. To measure capacity, plug the head of the black (negative)
tipped measuring conductor into the “COM” socket and the
head of the red (positive) conductor into the “INPUT” socket.
2. Use the circular switch to select between 1,000 µF, 20 µF
or nF range.
3. Choose automatic or manual measurement using the
RANGE button.
4. Connect the measuring tips to the measured object (capaci-
tor). If the object is e.g. an electrolytic capacitor, observe cor-
rect polarity when measuring. (red measuring cable should
be connected to the positive pole of the capacitor, black to
the negative pole of the capacitor).
The screen will show the measured capacity value.
Note: When the capacity range is low, the capacity value on the
screen may be unstable. In that case, the measuring tips were not
connected to the object (capacitor). This is a normal phenomenon
and does not affect measurement.
Circuit Continuity Test
1. To test circuit continuity, plug the head of the black
(negative) tipped measuring conductor into the “COM”
socket and the head of the red (positive) conductor into
the “INPUT” socket.
2. Use the circular switch to select .
3. Use the FUNC button to select circuit continuity measure-
ment; the screen will display the symbol.
4. Connect the measuring tips to the measured circuit.
If the resistance of the measured circuit is lower than 30 Ω,
the buzzer will turn on.
Diode Measurement
1. To measure diodes, plug the head of the black (negative)
tipped measuring conductor into the “COM” socket and the
head of the red (positive) conductor into the “INPUT” socket.
2. Use the circular switch to select .
3. Use the FUNC button to select diode measurement; the
screen will display the symbol.
4. Connect the red measuring tip to the anode of the diode
and black measuring tip to the cathode.
5. The screen will show the approximate voltage in the direc-
tion of the current flow. If polarity is switched, “OL” will
appear on the screen.
Transistor Measurement (Gain)
1. Use the circular switch to select hFE range.
2. Connect the adapter for measuring transistors into the COM
(minus) and INPUT (plus) sockets according to figure 2. Make
sure the connection is correct!
3. Before measuring, determine whether the transistor is of
type NPN or PNP and determine the base, emitter and col-
lector. Plug the transistor leads into the designated holes
in the adapter.
4. The screen will show an approximate hFE gain value of
the transistor.
(see Fig. 2)
1 – Transistor Test Socket
Temperature Measurement
1. Use the circular switch to select Temp range.
2. Use the FUNC button to select between °C or °F units.
3. Plug the black head (minus) of type K temperature probe
into the COM socket and the red head (plus) of the probe
into the INPUT socket .
4. Carefully place the end of the temperature probe onto the
measured object. The measured object must not be live; be
mindful of any rotary parts of various devices.
5. Wait a moment and the screen will display the measured
temperature.
Note: The type K temperature probe included in the multimeter is
designed for measuring temperatures ranging from -20 °C to 250 °C.
Measuring temperatures higher than 250 °C may cause damage to
the temperature probe and the multimeter! If you wish to measure
higher temperatures, use a different temperature probe with a higher
measurement range!
Automatic Switch-off
The multimeter switches off automatically after 15 minutes of
inactivity. Before switching off automatically, the multimeter will
beep several times. The multimeter will then switch off within 1
minute, accompanied by a longer beep.
The multimeter can be turned back on by pressing any button
or by turning the circular range switch.
If you press a button after an automatic switch.off, the
automatic switch-off function will be disabled.
Replacing Batteries
If the screen shows the symbol, it is necessary to change
batteries. To change batteries, use a screwdriver of corresponding
size (a smaller screwdriver may damage the lock) and gently turn
the lock on the back of the multimeter by 90° (see fig. 3). Using
brute force may result in damage to the rotary lock. Replace the
drained batteries with 3× 1.5 V AAA batteries. Use batteries with
the prescribed parameters. We recommend using high-quality
alkaline batteries. Make sure to observe the correct polarity of
the batteries. Once you have changed the batteries, replace the
cover and carefully turn the lock back.
Before replacing batteries, disconnect the measuring tips
from the measured circuit or device.
(see Fig. 3)
To open the battery cover
1 – Rotary Lock
Replacing a Fuse
If a fuse burns out, it is most commonly caused by improper use.
The multimeter uses fuses with the following parameters: F 250
mA L 300 V, quick response.
The fuse is located under the battery cover. Always replace the
fuse with a fuse of the same type and with the same parameters.
Replace and close the battery cover.
To replace an F 10 A L 300 V fuse, contact a service centre.
Before replacing a fuse, disconnect the measuring tips from
the measured circuit or device.
Accessories
1 manual
1 pair of measuring tips
1 type K temperature probe
1 adapter for measuring transistors
1 battery cover lock
The device is not intended for use by persons (including
children) whose physical, sensory or mental disability or lack
of experience and expertise prevents safe use, unless they are
supervised or instructed in the use of this device by a person
responsible for their safety. It is necessary to supervise children
to ensure they do not play with the device.
Do not dispose with domestic waste. Use special collection
points for sorted waste. Contact local authorities for infor-
mation about collection points. If the electronic devices
would be disposed on landfill, dangerous substances may reach
groundwater and subsequently food chain, where it could affect
human health.
Emos spol. s r. o. declares that the MD-420 is in compliance with
the essential requirements and other relevant provisions of Direc-