MRC SL-4012 Operation Manual

SOUND LEVEL
METER

Model : SL-4012

Your purchase of this
SOUND LEVEL METER
marks a step forward for
you into the field of
precision measurement.
Although this METER is a
complex and delicate
instrument, its durable
structure will allow many
years of use if proper
operating techniques are
developed. Please read
the following 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....................................

.

4

3-1 Microphone....................................................... 4

3-2 Display..............................................................4

3-3 Power On/Off Button.........................................

.

4

3-4 Hold Button.......................................................4

3-5 REC./Max. Min. Button.......................................4

3-6 Max. Hold Button...............................................4

3-7 A/C Wei

g

hting Button.........................................4

3-8 Time Wei

g

hting ( Fast / Slow ) Button.................4

3-9 Ran

g

e Button....................................................4

3-10 AC Output Socket............................................

.

4

3-11 Calibration VR..................................................4

3-12 RS232 Computer Interface Socket....................

.

4

3-13 Battery compartment / Cover...........................

.

4

3-14 Stand..............................................................4

4. MEASURING PROCEDURES.......................................

.

5

5. AUTO POWER DISABLE............................................

.

8

6. MEASURING CONSIDERATION..................................

.

8

7. SIGNAL OUTPUT......................................................

.

8

7-1 AC output..........................................................

.

8

7-2 RS232 computer interface ........................................9

8. REPLACEMENT of BATTERY......................................

.

10

9. CALIBRATION .........................................................

.

10

10. FREQUENCY WEIGHTING CHARACTERI

STICS

OF A &

C NETWORKS.............................................11

11. TIME WEIGHTING (FAST & SLOW)
CHARACTER

ISTICS................................................

.

11

1. FEATURES

* Large LCD display, easy to read.
* Main functions are designed to meet IEC 61672 class 2.
* A & C weighting networks comply with standards.
* 0.5" standard microphone head.
* Time weighting (Fast & Slow) dynamic characteristic
modes.
* AC output for system expansion.
* RS232/USB computer interface.
* Auto range & Manual range selection.
* Available for external calibration adjustment.
* Condenser microphone for high accuracy & long-term
stability.
* Memory function to store

the Max. & Min. value.
* Hold and MAX. Hold functions.
* Operation key used push button.
* LCD display for low power consumption & clear read-out
even in bright ambient light condition.
* Using 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 52 mm x 32 mm LCD (Liquid crystal

display), 5 digits with annunciator.

Function dB ( A & C frequency weighting ), Time

wei

g

hting(Fast, Slow), Hold, Memory
( Max. & Min. ), Max. hold, AC output,
RS232 output.

1

Measurement 30 - 130 dB.
Ran

g

e
Resolution 0.1 dB.
Accuracy * Meet IEC 61672 class 2, tested under

(

23± 5

)

℃

Input signal level on 94 dB &
frequency ran

g

e from 31.5 Hz to

8 k Hz, refer to pa

g

e 11.

Range selector

Auto range :

30 to 130 dB.

Manual range :

3 range, 30 to 80 dB, 50 to 100 dB,
80 to 130 dB, 50 dB on each step,
with over & under ran

g

e indicating.
Frequency 31.5 to 8,000 Hz.
Microphone type Electric condenser microphone.

Microphone size Out size, 12.7 mm DIA. ( 0.5 inch).
Weighting Network Characteristics of A & C.
Range selector Manual range: 3 ranges ( 30 to 80 dB,

50 to 100 dB, 80 to 130 dB ).

Auto range: 30 - 130 dB.
Time weighting Fast - t= 200 ms, Slow - t = 500 ms,
( Fast & Slow ) * "Fast" range is simulated the

human ear response time.

* "Slow" range is easy to get the avg.

values of vibration sound level.

* The "Fast" & "Slow" response

range are designed to meet IEC 61672

class 2 requirement.
Calibrator B & K (Bruel & kjaer), MULTIFUCTION

ACOUSTIC CALIBRATOR 4226.
Output Signal

* AC output :

AC 0.5 Vrms corresponding to each
ran

g

e step.

Out put impedance - 600 ohm.

* RS232 output.

2