Measurement Procedure - YATO YT-73085 Manual Original

maintenance work without ensuring that the test leads have been disconnected
from the meter and that the meter itself has been switched off .
Replacing the battery
The multimeter requires batteries, the number and type of which are specifi ed
in the technical specifi cations. It is recommended to use alkaline batteries. To
install a battery, open the instrument casing or the battery compartment cover
on the underside of the meter. Before accessing the battery compartment it may
be necessary to slide off the cover of the meter casing. Connect the battery ac-
cording to its terminal marking, close the casing or battery compartment cover. If
a battery symbol appears on the screen, the battery must be replaced. For the
sake of measurement accuracy, it is recommended to replace the battery as
soon as possible after the battery symbol appears.
Fuse replacement
The device uses a fast-acting safety fuse. In case of damage, replace the fuse
with a new one with identical electrical parameters. To do so, open the meter's
casing, following the same procedure as in the case of battery replacement and
following the safety rules, replace the fuse with a new one.
Switching the meter on and off
Setting the measurement switch to the OFF position will turn off the meter.
The remaining switch positions activate the meter and permit selection of the
measured quantity and its range. The meter turns off automatically if not in use.
After about 15 minutes of inactivity, the meter will automatically turn off . This
will reduce battery consumption. Approximately one minute before turning off
the power supply, the user will be notifi ed by means of an audible signal and a
fl ashing diode underneath the LCD display. The power supply of the meter will be
restored after changing the position of the selector. When switched on, the meter
displays the APO symbol, which means that it operates in the automatic power
off mode in case of inactivity on the part of the user.
SELECT button
The button is used for manual selection of the measured value in the case of
resistance measurement / diode testing / conductivity test, as well as in the case
of temperature measurement, where it is possible to select a measurement unit.
H/* button
The button is used to retain the measured value on the display. When pressed,
the button will keep the currently displayed value on the display, even after the
measurement is over. Press the button again to go back to the measurement
mode. The operation of this function is indicated on the display with the "H" char-
acter. Pressing and holding the button for approx. 2 seconds will illuminate the
display of the meter. The backlight goes off automatically after several seconds.
MAX/MIN button
The button is used to activate the operating mode in which the maximum or
minimum measurement result will be displayed from the moment of activating
the given mode. Pressing the button again allows you to change the measure-
ment mode in the cycle: maximum (MAX) / minimum (MIN) / instantaneous value
(AUTO). Symbols which will be displayed on the screen depending on the mode
of operation selected are enclosed in brackets.
RANGE button
The button is used to manually change the measuring range for a given quantity.
When it is pressed, the symbol AUTO will disappear. Pressing the button again
switches the range in the order shown in the table. Holding down the button for
approx. 1 second restores automatic ranging.
RELATIVE button
The button allows you to measure relative values. The function is available
for each selector position except for frequency and duty cycle measurements.
Pressing the RELATIVE button during a measurement will reset the display and
record the value which was visible before displaying it as a reference level. The
new measurement will show the diff erence between the measured value and the
recorded reference value. When pressed again, the button restores the normal
measurement mode. This function is indicated by a triangle symbol.
Hz/DUTY button
The button allows you to choose between frequency or duty cycle measurement
when the selector is set to "Hz/Duty".
Connecting test leads
If the test lead plugs are capped, the caps must be removed before plugging
the leads into the jacks. Connect the leads in accordance with the instructions in
the manual. Now remove the covers (if any) of the measuring parts and proceed
with the measurements.
Adapter for testing small electronic components
10
O R I G I N A L I N S T R U C T I O N S
GB
The adapter can be used for testing small electronic components, resistors, ca-
pacitors, diodes, transistors, etc. The adapter is connected directly to the INPUT
and COM jacks so that the terminal of the adapter marked + goes in the INPUT
jack and the terminal marked – in the COM jack. The adapter jacks marked E,
B, C are used for testing transistors; the jacks marked + and – can be used for
testing electronic components fi tted with two contacts.
Built-in buzzer
The meter has a built-in buzzer that beeps briefl y each time the selector is
moved or a button is pressed to confi rm that. The buzzer will emit several beeps
per minute before the meter is automatically switched off and one long beep
immediately before it is automatically switched off . The meter switches off au-
tomatically 15 minutes after the last pressing of the button or a change of the
selector position.
Magnetic hanger
There is a magnetic hanger attached to the rear wall of the meter, which allows it
to be attached to steel surfaces. Make sure that both the circular magnetic pads
adhere to a metal surface with their entire surface. This will protect the meter
from unexpected detachment and falling. If the hanger is not used, it can be
attached to a dedicated place on the battery compartment lid.

MEASUREMENT PROCEDURE

Depending on the current position of the range switch, the display will show
three digits. If the battery needs to be replaced, the multimeter indicates this by
showing the battery symbol on the display. If the sign "–" appears on the display
before the measured value, it means that it has a reversed polarity relative to
the meter's connection. If an overload symbol appears on the display, it means
that the measuring range has been exceeded and the measuring range must be
changed to a higher one.
In the case of measurements of unknown values the meter should be set to the
AUTO mode, in which case it determines the best measuring range by itself. If
the selector is set to measure AC current or voltage, the meter will start meas-
uring in the True RMS mode. This means that the real eff ective value of the
alternating wave will be measured. If a non-sine wave is measured, the actual
RMS value of the wave will be rendered. Special care should be taken when
measuring quantities within the highest voltage range to avoid electric shock.
CAUTION! Never allow the measuring range of the meter to be smaller than
the measured value. This can damage the meter and cause electric shock.
The correct connection of the leads is:
The red lead goes in the jack marked "INPUT" or "mA" or "10A".
The black lead goes in the jack marked "COM".
In order to achieve the highest possible measurement accuracy, optimal meas-
urement conditions should be ensured. The ambient working temperature should
be in the range from 18 to 28
Example of accuracy determination
Accuracy: ±(% of indication + weight of the least signifi cant digit)
Measurement of DC voltage: 1.396 V
Accuracy: ±(0.8% 5)
Calculation of error: 1.396 x 0.8% + 5 x 0.001 = 0.011168 + 0.005 = 0.016168
Measurement result: 1.396 V ± 0.016 V
Voltage measurement
Connect the test leads to the jacks marked "INPUT" and "COM". Set the range
switch to the DC or AC voltage measurement position. Connect the test leads in
parallel to an electrical circuit and read the resultant voltage. Never measure a
voltage which is higher than the maximum measuring range. This can damage
the meter and cause electric shock.
Current measurement
Depending on the expected current, connect the test leads to the mA and COM
jacks or the 20A and COM jacks. Select the appropriate measuring range using
the knob. The maximum current fl owing through the mA jack can be 600 mA. If
the current exceeds 600 mA, connect the lead to the 20A jack. The maximum
current measured in the 10A socket may be 10 A, but the measurement time for
currents higher than 2 A must be no more than 15 seconds, after which there
must be a 15-minute break at a minimum before the next measurement. The mA
socket can be loaded with a maximum current of 600 mA without any time limit.
It is forbidden to exceed the maximum values of currents and voltages
for a given jack. Test leads should be connected in series to the tested electri-
cal circuit. Select the type of current measured using the selector and read the
measurement result. The meter automatically selects the appropriate measuring
range, which can be changed by pressing the RANGE button if necessary.
C and relative air humidity <75%.
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