YF-20 MANUAL
This model YF-20 Sound Level Meter is suited to checking noise levels in almost
any environment including factories, offices and homes.
The meter is designed to provide the preferred “A” weighted response. This
response is universally accepted for environmental noise measurements and is
similar to that of the human ear.
Features
1. One-handed simple, easy to operate
2. In-built reference signal.
3. In-built battery test.
4. Quickly, accurately measures sound level.
5. Compressed scales minimize range switching.
Battery Installation
1. The meter requires one 9 volt battery (Type 216, 006P 622 or similar).
2. Slide the battery cover down from the rear of the meter.
3. Connect the battery to the matching snap connector and fit the battery to the
battery compartment so that the bottom of the battery is below the “CAL ADJ
“ marking and the battery wires are concealed behind the battery.
4. Replace the battery compartment cover.
Battery Test
1. Rotate the control knob to the “BATT” position.
2. If the meter needle is within the range of the blue ‘B.OK’ scale then the battery is
usable.
*Note: Do not leave the control knob in the “ BATT” position as this could quickly
flatten the battery.
Calibration Check
1. An internal reference signal is available for checking the meter’s operation.
2. Rotate the control knob to the “CAL” position.
3. The meter needle should indicate 70Db, any other reading may indicate that the
meter has been damaged.
4. Though not normally necessary, the reading can be re-calibrated by adjusting the
“CAL ADJ” control located.
5. In the battery compartment, using a non-conductive screwdriver.
*Note: Before attempting re-calibration, ensure that the battery is in good condition.
Proper calibration requires suitable test equipment.
Operation
1. Before checking the meter by performing a battery test and a calibration check
as detailed above.
2. Switch the control knob to the “Hi” position.
3. To measure the noise from a particular object, hold the meter a known distance
from the object and point it towards the noise source.
4. To measure ambient noise in a workplace, for example, position the meter at
the workers locations and rotate it to obtain the highest reading in each location.
5. If the meter reads below 80Db, then switch it to the “Lo “ range.
Specifications
1. Range Lo: 40-80 dBA SPL.
Hi: 80-120 Dba SPL.
2. Current 5mA (Operating)
3. Consumption 14mA (BATT test)
4. Size 160mm x 65mm x 38mm.
5. Weight 165g
Cautions
1. Do not drop the meter or subject it to similar impact as this could damage the
meter movement or affect the unit’s calibration.
2. Do not leave a battery in the unit if it is not being used regularly as most batteries
can leak of corrode.
Noise Level Examples
(dBA)
130 Threshold of pain.
115 Disco/ Rock concert.
105 Low-flying jet.close thunder.
95 Lawnmower.
85 Orchestral concert.
75 Factory, traffic at 10 meters.
65 Vacuum cleaner, conversation.
55 Light traffic at 30 meters
45 Quiet residence-daytime.
35 Quiet residence-nighttime.
25 Soft whisper.
Warranty
1. This product is warranted against manufacturing defects for a period of 12
months from the date of purchase.
2. Retain the original copy of your sales receipt as evidence of purchase date.
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