BRUEL & KJAER Mediator 2238 Скачать руководство пользователя страница 9 | Manualshive

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BRUEL & KJAER Mediator 2238 Скачать руководство пользователя страница 9

Chapter 1 — Introduction

Detectors

2238 Mediator Integrating Sound Level Meter

Service Manual

BI 5043 –13

3

Fig.1.1

Simplified block diagram for 2238 Mediator

1.5

Detectors

One of the main features of Mediator is that it contains two detectors with independ-
ent frequency weighting functions. In the basic package, one is an RMS detector and
the other a Peak detector. Linear and A- and C-weighting can be selected for both
detectors. F (Fast), S (Slow) and I (Impulse) time weighting must be selected in the
basic version. Both frequency and time weightings must be selected before a meas-
urement is performed in the basic package. In other packages F, S and I are measured
in parallel.

1.6

Application Programs

●

Basic Software BZ 7126 – General purpose SLM functions featuring: Independently
weighted RMS and Peak detectors in parallel, pre - selected F, S, and I time con-
stants, all parameters for occupational health work – Exchange rate = 3 plus ei-
ther 4 or 5, manual control or preset time with automatic storage, 500
measurement files, corrections for windscreen effects and sound incidence, AC
and DC outputs, serial interface control,

L-filter

MUX

Aux 1
Aux 2

A-filter

C-filter

Overload detector

1/1- and 1/3-Octave
Filter Set

Correction filter
(Sound Incidence,
Windscreen)

Amplifier

10 dB/step

(Cal. adjustment)

Preamplifier

MUX

Buffer

AC out

RMS
detector

Time weighting

1

Buffer

DC out

Peak/RMS

2

detector

Digital control
and processing

Power supply

Display

Keys

Microphone

RMS 1 RMS 2

3

PEAK AUX1/2

3

External
power
supply

980091e

Batteries 6V
(4 x AA size)

Serial
interface

1

No

time weighting with peak detector

2

Only peak detector in basic version

3

Not available in Basic Version

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Содержание Mediator 2238

Страница 1: ...BI 5043 13 Technical Documentation 2238 Mediator Integrating Sound Level Meter Service Manual...

Страница 2: ......

Страница 3: ...February 2002 BI 5043 13 Br el Kj r 2238 Mediator Integrating Sound Level Meter Service Manual 2238 Mediator Integrating Sound Level Meter Service Manual...

Страница 4: ...the user refers to the associated warning statements given in the Manual Chassis Terminal Safety Earth Terminal Hazardous Voltage Warnings This is a CISPR II Class A product In a domestic environment...

Страница 5: ...er an Entire 2238 as an FRP 5 1 12 Mechanical Spare Parts 6 1 13 Repair 6 Types of Repair 6 Replacement of Entire Unit as FRP 6 Special Tools and Equipment 6 1 14 About Calibration 7 2 Checking Proced...

Страница 6: ...tave Filter Upgrade 19 Initial Calibration 20 3 Mechanical Parts 21 3 1 Dismantling Kit WZ 0065 23 3 2 Dismantling 23 How to Open and Lock the SMD Connectors for Ribbon Cables 24 3 3 Filter Set Upgrad...

Страница 7: ...2238 Mediator Integrating Sound Level Meter Service Manual BI 5043 13 1 Chapter 1 Introduction...

Страница 8: ...are packages or a combination of these packages You can easily upgrade the software via the serial RS 232 interface or it can be performed at a Br el Kj r service centre The Frequency Analysis Softwar...

Страница 9: ...purpose SLM functions featuring Independently weighted RMS and Peak detectors in parallel pre selected F S and I time con stants all parameters for occupational health work Exchange rate 3 plus ei th...

Страница 10: ...tion and the possibility of two simultaneous RMS measurements 1 7 Changing Application Push the key to display the System menu from which you can select the desired application module 1 8 Installing U...

Страница 11: ...ttempt is made and the part subsequently needs to be exchanged the price of an exchange FRP is 100 the price of a new one If testing shows the fault is in one of the parts covered by the FRP scheme th...

Страница 12: ...h the customer s original bottom shell with the Serial Number Remove the Octave Filter Set from the customer s unit if applicable and install in the replacement Check that the replacement software mat...

Страница 13: ...icrophone Simulator with 13 pF capacitor WZ 0065 Set of 3 special tools for complete dismantling Power Supply with variable voltage 3 15 V DC Digital Voltmeter Optional Equipment Decade Attenuator or...

Страница 14: ...2238 Mediator Integrating Sound Level Meter Service Manual Br el Kj r 8...

Страница 15: ...2238 Mediator Integrating Sound Level Meter Service Manual BI 5043 13 9 Chapter 2 Checking Procedure...

Страница 16: ...and the keys are always used to select values Range Press this key to access the Range Setting menu Use the keys to step through the available measurement ranges or scroll with the key Reset Resets th...

Страница 17: ...s must be removed or for the noise check replaced by an equivalent electrical impedance 2 2 1 Results Not Achieved If the expected result is not achieved when a certain check is done the defective par...

Страница 18: ...the 2238 s power on Press then to select General Press to set Range to 50 0 130 0 dB Press to OK then and to se lect Weightings Use to select BB F on the Bandwidth line Use to go to the Freq Wgt line...

Страница 19: ...ou change to C Weighted LCFP To change weightings press then to Weightings and to select Use to navigate to the Freq Wgt line and to the next desired weighting Use to OK and to close and return to the...

Страница 20: ...range to 50 130 dB Use to select OK then to Close Set generator output to 2 0 V 126 dB V 20 Hz Result No overload indicated Display reads 123 8 dB RMS Action Increase Generator output by 1 5 dB Result...

Страница 21: ...0 30 dB Range Table 2 5 Attenuator Linearity 2 3 6 Detectors Amplitude Linearity of RMS and Peak Detectors Action Set the generator s frequency to 1 kHz and adjust the amplitude to read 94 0 dB on the...

Страница 22: ...ting to Broadband Slow Press select Weightings then until you get BB S Press and to set Frequency Weighting as given in Table 2 7 Warning The display reading for the different Frequency Weightings mus...

Страница 23: ...to On Decrease voltage from the power supply to 4 5 V DC Result A Battery Low warning must be flashing in the upper right hand corner of the display Action Decrease the voltage from the power supply f...

Страница 24: ...microphone and acoustic coupler still attached to the 2238 press and set the range to 20 100 dB then to OK On the 4226 select Test Level on the Function switch and adjust output until the 2238 display...

Страница 25: ...to set it to L then to OK and to Close and return to the active display Set the generator to an appropriate level and adjust the output until the display on the 2238 reads 100 0 dB With this as a refe...

Страница 26: ...r to delivery to the customer when the unit is first purchased Assure that batteries are new or use a power supply during this procedure Place 2238 in LCFInst mode by setting Bandwidth to BB F and Fre...

Страница 27: ...2238 Mediator Integrating Sound Level Meter Service Manual BI 5043 13 21 Chapter 3 Mechanical Parts...

Страница 28: ...apter 3 Mechanical Parts 2238 Mediator Integrating Sound Level Meter Service Manual Br el Kj r 22 Fig 3 1 Exploded view of Type 2238 32 33 5 38 34 35 15 14 12 11 10 9 8 7 6 3 2 1 36 5 4 4 37 13 980498...

Страница 29: ...is for removing the LEMO Connectors item 14 in Fig 5 1 one is for removing the Special Nut item 2 and one for removing the Ext Power connector item 12 in Fig 5 1 WZ 0065 is also used with Types 2236 2...

Страница 30: ...on the middle by a suitable tool 3 3 Filter Set Upgrade With Type 2238 opened turn the analog board item 38 over to expose the 16 pin female connector Carefully position the Octave Filter item 34 over...

Страница 31: ...rs for item 5 4 pcs 5 YS 0285 Screws for fixing Display VU 1030 to Top Shell 4 pcs 6 DM 0292 1 pole Battery Contact 2 pcs 7 DM 0294 2 pole Battery Contact 3 pcs 8 FB 0643 Bottom PC ABS Shell without S...

Страница 32: ...Dust Cap for AC DC Output Sockets 2 pcs 29 DZ 9742 Dust Cap for External Power Socket 30 QV 0217 Diode Signal 2 pcs 31 YL 0278 Soldering Lug mounted between Serial Interface Connector and Chassis 3 5...

Страница 33: ...rs Description 3 RMS and Peak Amplitude Linearity Testing 15 Dismantling Dismantling Kit WZ 0065 23 Procedure 23 E Exchange Scheme 5 External Power Supply 17 F Field Replaceable Parts 26 Filter Set 4...

Страница 34: ...28 Standards 2 T Tests Crest Factor 18 Overload 14 RMS and Peak Amplitude Linearity 15 Tone Burst 18 Undervoltage 17 Tools and Equipment 6 Types of Repair 6 U Upgrades Application Programs 4 Octave Fi...

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