&. Operating Instructions
6-1 Turning the unit on and off
6-1-1 Press the
<!)
button to turn on the meter.
After 10 minutes without any button p19Sses, the mater will
1
automatically power off.
6-1-2 Press the C) button again to turn off the meter manually.
6-1-3 To temporarily disable the automatic power off function, with the
meter initially "off', press and hold the F/S button then press and
release the
O
button to tum on the meter. After the $Creen briefly
turns and then goes blank, release the F/S button. The meter should
now remain on and continue to measure as long as it has battery
power or until the user turns it off by pressing the O button. This
feature may be useful when testing alarm systems without the
help of an assistant to operate the meter. The meter will revert to
its normal 10 minute automatic power off function the next time it is
powered off and on again without holding the F/S button.
6-2 A/C frequency weighting selection
6-2-1 Press the A/C button to select measurement frequency weighting
method A or C (your selection will display on the right side of the LCD
screen as dBAor dBC).
6-2-2 The meter always defaults to A-weighting when powered on.
A weighting enables the meter to respond in a manner similar to the human
ear, which is less sensitive to low frequency sounds than high frequency
sounds and so the perceived loudness varies with the source
frequency. Typical applications include environmental measurement, law
enforcement and workplace design.
C weighting is suitable for flat response measurements with no low
frequency measurement rolloff across the lower part of the sound
frequency spectrum (below 1 KHz). Typical applications include the sound
level analysis of machinery and engines.
6-3 MAX value measurement function
6-3-1 To have the meter capture and hold the maximum, or peak
sound pressure level measurement, press and release the
MAX button to freeze the maximum measurement on the screen.
The reading will remain unchanged until a higher level reading is
detected and captured. Note that the bar graph will continue to
change/fluctuate to reflect the current sound level reading. When
operating in MAX mode, the "MAX'' screen icon will be indicated on
the LCD display.
6-3-2 Press the MAX button again to exit MAX, or peak capture, mode.
6-4 FAST/SLOW response function
6-4-1 The meter defaults to fast response mode when it is powered on.
6-4-2 Pressing the FIS button toggles the meter's response and display
update modes between Fast (125 millisecond meter response time
with numeric display updating at 2 times/second), and Slow (1 second
meter response time and numeric display updating at 1 time/second).
The meter's bargraph display will update at the 125 millisecond (Fast)
or 1 second (Slow) response time intervals.
6-5 BACKLIGHT function
Press Backlight button to tum the backlight on or off.
6-6 Setting Ume and date
6-6-1 To set the date and time on the meter, start with the meter powered
"Off". Press and hold the A/C button and the press and release
the Power Button O . The LCD screen should clear and you will see
the current time displayed with a flashing digit in the hours field.
6-6-2 Press the MAX button to decrement the value, or press the Back
llght button to increment the value of the flashing digit as needed.
6-6-3 Press the F/S button to select the next digit to the right, or press
the A/C button to select the next digit to the left of the currenUy
selected(flashing} digit. Use the MAX and Backllght buttons as
needed to adjust the values of each digit.
6-6-4 After setting the time, press the F/S button to move past the right most
digit (Seconds} and the display will change to show the date in MM
DD-YY format. As with setting the time in 6-6-2 and 6-6-3, use the
A/C and F/S buttons to select the digits to edit, and the MAX and
Backllght buttons lo decrement or increment the value
6-6� When finished, press the REC button to store the time and date
settings and return the meter to measurement mode.
7. Battery Replacement
If the meter does not power on normally or the low battery icon �
appears on the LCD display, replace the batteries as soon as possible. Use
a screwdriver to unscrew the back battery compartment cover and install 4 x
M batteries. Reinstall the batter compartment cover and screw before use.
a.
Operating Precautions
8-1 Wind blowing across the microphone could cause additional
extraneous noise. When using the instrument outdoors or in the
presence of wind/airflow please ensure the sponge ball is fitted to
achieve better measurement results.
8-2 Do not store or operate the instrument at high temperature or in a
high humidity environment.
8-3 Keep microphone dry and avoid severe vibration.
8-4 When not in use for prolonged periods it is recommended that you
remove the battery.
9. Tripod Mount
Mounting the meter via a camera tripod (not supplied) will increase the
stability & accuracy of the meter readings by eliminating any sound waves
reflected from the user.
10. DC Output
10-1 Use the DC output connector and output voltage lead wires to
connect the sound level meter to a datalogger, digital multimeter,
or oscilloscope for recording sound level pressure measurements.
The output voltage scaling is 33mV/dB referenced to the "floor" or
threshold detection level of 30dB. Thus, a measurement of 94dB
would result in an output of approximately 2.1V DC = ( (94dB - 30dB)
x 33mV/dB).
11. AC Output
11-1 Use the AC output connector and output voltage lead wires to
connect the sound level meter to a datalogger, digital multimeter, or
oscilloscope for recording sound level pressure measurements. The
output voltage scaling is 2.0VAC (RMS) a full scale (130dB). This
output is an unamplified signal from the input transducer circuit, so
the output AC voltage level scales logarithmically with increasing sound
pressure level (SPL). For each 20dB increase in SPL, the AC voltage
output increases by a factor of 10. For example, at 90dB, the output is
approximately 18mV and at 110dB, the output is approximately 180mV.
12. Trouble Shooting
12-1 Pressing the power button to tum on the unit and the display doesn't
tum on, or display clears/displays nothing:
a. Check to ensure that the batteries are in good condition, properly
installed with good contact to the pins and with the correct polarity.
b. Remove batteries for one minute and re-install.
c. Replace the batteries with new ones.
12-2 For all other issues please contact your supplier.
Warranty
Triplett/ Byle Brothen, extends the lllllowing wananty to the original pun:haser of these goods lllr
use. Triplett warrants to the otigioal purchaser for use Iha! 1he products sold by H will be free from
defects in workmanship and material for a period of (3) three years from the date of purchase.
This warranty does not apply to any of our products which have been repaired or allered by unauthor
ized persons in any way or purchased from unauthorized distributors so u, in our sole judgment, to
injure lheir stability or reliability, or which have been
""bjecl
to misuse, abuoe, misapplication, neg
ligence, a<:ddent or which have had the serial numbers altered, defaced. or remowd. Acc:enones.
including batteries and fuses, are not covered by this warranty.
To register a claim under the provisions of this ......,.n1y, pleae conlacl the distributor from which you
pun:hued lhe product from for wan-anty
consideration.
ALL WARRANTIES IMPLIED BY LAW ARE HEREBY LIMITED TO A PERIOD OF TIIREE YEARS
FROM DATE OF PURCHASE, AND THE PROVISIONS OF THE WARRANlY ARE EXPRESSLY IN
LIEU OF AHY OTHER WARRANTIES EXPRESSED OR IMPLIED.
The purdiasengrees to auume all liability for any damages and bodily injury which may resuR
from the uoe or misuse of the producl
by
the pun;haser. hi• employees. or olhers. and lhe remedies
provided for in this warranty are expre11ly in lieu of any other liability Triplett may have, including
incidental or consequential damages.
Some - (USA ONLY) do not allow the exdusion or limitation of incidental or consequential dam
ages, so the .ix,,,., limitation or e,o;lusion
may
not apply lo
you
No represenllltive of Triplett I Byte
Brothers or any other person is authorized lo extend the liability of Triplett in connection with the sale
of its producls beyond the terms hereof.
Triplett/ Byte Brothers reserves the
right
to discontinue models at any time, or change specifications,
prk:e or design, without notice and without incurring any obligation.
This warranty gives
you
specific legal rights, and
you
may have other rights which vary from slate
1o
slat&.
Part Number: 3550
Mad•lnCn1n1
84-910
1/15
www.
GlobalTestSupply
.com
Find Quality Products Online at:
sales@GlobalTestSupply.com
