NARIKA A05-7856-W0 User manual

Instruction manual
A05-7856-W0
Sound Oscilloscope
Sept. 2021

1
Safety Precaution
Do not disassemble, repair and remodel this product. This product might stop
working and warranty will be void.
Keep dry. Otherwise, the product can be damaged, short-circuited or create a
shock hazard.
Teacher or trainer must instruct students about the safe ways of conducting
experiments with this product before actually conducting experiments.
When you find that something is broken, please do not repair the product by
yourself and contact your distributor.
Introduction
Handy and portable oscilloscope specialized in experiments with properties of sound for
students. Designed to meet the basic demands of typical school laboratory works to observe
the waveform of sound and is suitable for students' experiments in groups. Dedicated
microphone that comes with the product enables students to capture the sound and then
instantly observe the sound waveform on the screen.
Contents
A: Sound Oscilloscope B: Microphone C: Probe D: AC adaptor (Not included)
A
B
C
D

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Specification
A: Sound Oscilloscope
Display : 2.4 inches TFT color display
Input Channels : 1 channel
Frequency band : 0 ~ 200 kHz
Sampling rate : 1 M samples/s
Transverse sensitivity control:
- Sensitivity 10 µs/Div ~ 500 s/Div
Vertical sensitivity control:
- 5 mV/Div~20 V/Div
- Maximum Input Voltage: 50 V
- Input Impedance: 1 MΩ
Size: 115 x 75 x 22 mm
B: Microphone
Type : Dynamic type
Frequency Characteristics: 80 - 15 kHz
Directivity : Unidirectional Microphone
Output impedance: 500 Ω
Output terminal: BNC
Others : ON-Off switch
C: Probe : For measuring non-audio electric signal.
D: AC adaptor (not included): DC 9 V 1.2 A

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Description
Sound Oscilloscope
[ FRONT PANEL]
[TOP/SIDE PANEL]
[BOTTOM/SIDE PANEL]
Signal and Menu Display
Y-axis (Voltage) Button
X-axis (Time, sec) Button
“HOLD” Button
“TRIGRER” Button
Adjustment Knob
AC/DC/GND Selection switch
Trigger signal output terminal
BNC input connector
AC Adaptor DC9V, 1.2A
ON/OFF switch

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[SIGNAL AND MENU DISPLAY]
Microphone
ON/OFF switch
BNC output connector
Voltage value
per one (1) division
on Y-axis
Selected measurement mode (AC/DC/GND)
Time value
per one (1) division
on X-axis
Trigger value
Selected trigger mode

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Procedure for observing waveform of sound
PREPARATION / SETTING
1. Connect AC adaptor and Microphone to Sound Oscilloscope.
Connect AC adaptor and Microphone to Sound Oscilloscope (Fig.1). Plug AC adaptor into the
jack at the bottom of Oscilloscope and Microphone into BNC input connector at the top of
Oscilloscope respectively (Fig.1).
2. Centering the baseline
Set the switch to the “AC” on the top panel and check if "AC" sign is shown on the menu
display. While switching the microphone on, adjust the baseline coming at the center of the
display by tuning the adjustment knob (Fig.2).
Fig.1 Fig.2
OBSERVATION and MEASUREMENT of Voice Sound
1. How to set the voltage value per one (1) division on the Y-axis:
Press Y-axis (Voltage) button and check if “Voltage value mode” on the Y-axis is selected at
the menu bar at the bottom of the display. Turn the adjustment knob in to 5 mV as the
adequate range for measuring voice sound. Check if "5mV" sign is displayed on the menu bar
(Fig.3).
NOTE: Selectable among 5 mV, 10 mV, 20 mV, 50 mV, 0.1 V, 0.2 V, 0.5 V, 2 V, 5 V, 10 V, and 20 V.
2. How to set the time value per one (1) division on the X-axis:
Press X-axis (time, sec) button and check if “Time value mode” on the X-axis is selected at
the menu bar at the bottom of the display. Turn the adjustment knob in to 2 ms as the adequate
range for measuring voice sound. Check if "2 ms" sign is displayed on the menu bar (Fig.4).
NOTE: Selectable among 24 steps (10 micro sec to 500 sec).

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Fig.3 Fig.4
3. How to set the trigger:
Trigger conditions includes "Mode", "Type" and "Level".
Press "TRIGGER" button to shift a trigger condition from
one to another.
1) Press the “TRIGGER” button and check if “Mode” area
is selected as the trigger condition. Turn the adjustment
knob in to "AUTO" mode. Check if "AUTO" sign is
displayed on the menu bar(Fig.5).
2) Press the “TRIGGER” button and check if ”Type” area is selected as the trigger condition.
Turn the adjustment knob in to a down arrow sign. Check if the down arrow sign is displayed
on the menu bar (Fig.6).
3) Press the “TRIGGER” button and check if ”Level” (for threshold value) area is selected as
the trigger condition. Turn the adjustment knob in to 3mV as the threshold voltage value.
Check if “3mV” numeric expression is displayed at the right end of the menu bar and a pink
arrow appears on the right margin of the Y-axis (Fig.7).
Fig.6 Fig.7
Fig.5

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4. How to observe waveform of voice sound:
Input your cardinal vowel such as [ɑ] (Fig.8) and [u] (Fig.9) into the microphone, then, you will
see the waveform displayed.
Fig.8 Sound waveform [ɑ] Fig.9 Sound waveform [u]
Observation of the waveform of non-audio
electric signal from
an oscillator
Plug the probe in the BNC input connector at the top of the Oscilloscope (Fig.10), pinch the
probe to an output terminal of the oscillator with the probe tip (Fig.11). Waveform of the
electric signal from the oscillator will be observed on the display.
Fig.10 Fig.11
Troubleshooting
In case no waveform is displayed,
a) it might be due to the misconfiguration of the product, (Re-set in accordance
with the “PREPARATION / SETTING” section.)
b) the switch of the microphone might be turned off. (Switch it on.),

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c) the AC/DC/GND Selection switch on the top panel might not be set to “AC”.
(Set the switch to “AC”.) and/or
d) input voice might be too weak. (Input loud voice into the microphone.)
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