SOUND LEVEL
METER
Model : SL-4011
Your purchase of this
SOUND LEVEL METE
R
marks a step forward for
you into the field of
precision measurement.
Althou
g
h this METER is a
complex and delicate
instrument, its durable
structure will allow many
years of use if proper
operatin
g
techniques are
developed. Please read
the followin
g
instructions
carefully and always keep
this manual within easy
reach.
OPERATION MANUAL
TABLE OF CONTENTS
1. FEATURES...............................................................1
2. SPECIFICATIONS.....................................................
.
1
3. FRONT PANEL DESCRIPTION....................................3
3-1 Electric condenser microphone...........................3
3-2 Display.............................................................
.
3
3-3 Power switch & Output type selector..................
.
3
3-4 A/C weighting & Calibration selector...................3
3-5 Time Weighting ( Fast / Slow ) / Max. hold
selector...........................................................3
3-6 Range selector..................................................3
3-7 Signal output terminal.......................................
.
3
3-8 Battery Compartment / Cover............................
.
3
3-9 Range upper / lower indicator............................3
3-10 Calibration VR (Accuracy adjust VR)..................3
3-11 Reset Switch for Max. Hold function..................3
4. MEASURING PROCEDURE.........................................4
5. MEASURING CONSIDERATION..................................5
6. SIGNAL OUTPUT......................................................5
7. REPLACEMENT of BATTERY......................................
.
5
8. CALIBRATION .........................................................6
9. FREQUENCY WEIGHTING CHARACTERISTICS
OF A & C NETWORKS...............................................7
10. TIME WEIGHTING (FAST & SLOW)
CHARACTERISTICS................................................
.
7
1. FEATURES
* Large LCD display, easy to read.
* Main functions are designed to meet IEC 61672 class 2.
* A & C weighting networks are conformity to standards.
* 0.5" standard out size of the microphone.
* Time weighting (Fast & Slow) dynamic characteristic modes.
* AC / DC output for system expansion.
* External calibration VR.
* Condenser microphone for high accuracy & long-term
stability.
* MAX. HOLD function for stored the maximum value.
* Reset switch for Max. Hold function.
* Warning indicator for over and under load.
* LCD display for low power consumption & clear read-out
even in bright ambient light condition.
* Used the durable, long-lasting components, including a
strong, light weight ABS-plastic housing case.
* Small and light weight design allow one hand operation.
2. SPECIFICATIONS
Display 18 mm (0.7") LCD (Liquid
crystal display), 3 1/2 digits.
Function dB (A & C weighting),
Time weighting (Fast, Slow),
Max. hold, AC output, DC output.
Measurement A Weighting- 3 ranges, 30 to 130 dB.
Range C Weighting- 3 ranges, 30 to 130 dB.
* Input Signal only.
Resolution 0.1 dB.
Accuracy * Meet IEC 61672 class 2, tested under
( 23± 5 )℃
Input signal level on 94 dB &
frequency range from 31.5 Hz to
8 k Hz, refer to page 7.
1
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