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Quest Engineering 1800 Instructions Manual

Precision integrating sound level meter
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instructions for
Model 1800
Precision Integrating
Sound Level Meter
and
Octave Band Filter
and
Model OB-300
1/1 - 1/3 Octave Band
Note: Due to the new ATEX Directive in Europe, all references in this document to "Ex" or
"EEx" for intrinsic safety approvals should be disregarded effective 7/1/03 within the member
countries of the European Union (EU). At this time, this product is not approved in accordance
with the new ATEX Directive and is not sold for use in hazardous atmospheres or explosive
zones by customers within the EU. Outside of the EU, all references to intrinsic safety
continue without change.
MODEL 1800 PRECISION IMPULSE INTEGRATING SOUND LEVEL METER
I.
II.
ABOUT THE METER . . . . . . . . . . . . . . . . . . . . . . . . .
A. The Display . . . . . . . . . . . . . . . . . . . . . . . . . .
E. External Filter Connector . . . . . . . . . . . . . . . . . . .
F. Internal Switches . . . . . . . . . . . . . . . . . . . . . . .
III.
A. Battery Check . . . . . . . . . . . . . . . . . . . . . . . . .
B. Calibration . . . . . . . . . . . . . . . . . . . . . . . . . .
IV.
C. Wind Screen Effects . . . . . . . . . . . . . . . . . . . . . .
D. Chart Recording . . . . . . . . . . . . . . . . . . . . . . . .
E. Data Logging with the NL-15 . . . . . . . . . . . . . . . . . .
V.
TECHNICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . .
A. Principles of Operation . . . . . . . . . . . . . . . . . . . .
F. Weighting Characteristics . . . . . . . . . . . . . . . . . . .
G. Internal Electrical Noise . . . . . . . . . . . . . . . . . . .
H. Response Charts . . . . . . . . . . . . . . . . . . . . . . . .
VI.
59-332 Rev C
5/97
VII.
INTRODUCTION TO THE MODEL OB-100. . . . . . . . . . . . . . . . .

TABLE OF CONTENTS

WITH THE OB-100/OB-300
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Microphone Handling and Storage . . . . . . . . . . . . . . .
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HOLD Button . . . . . . . . . . . . . . . . . . . . . . . . .
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RESPONSE Switch . . . . . . . . . . . . . . . . . . . . . . .
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MODE Switch . . . . . . . . . . . . . . . . . . . . . . . . .
dB RANGE Switch . . . . . . . . . . . . . . . . . . . . . . .
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PRINT . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC
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AC
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Mic. Polarization . . . . . . . . . . . . . . . . . . . . . .
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . .
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Summary of Contents for Quest Engineering 1800

  • Page 1: Table Of Contents

    TABLE OF CONTENTS MODEL 1800 PRECISION IMPULSE INTEGRATING SOUND LEVEL METER WITH THE OB-100/OB-300 INTRODUCTION TO THE MODEL 1800 ....A. Assembling the Meter .

  • Page 2: Introduction To The Model 1800

    INTRODUCTION TO THE MODEL 1800 degradation polarization The Quest Model 1800 may be used as a Precision Sound Level Meter, Impulse or charge may occur. This results in a Integrating Sound Level Meter. In all modes, the Model 1800 delivers Type 1 decrease in microphone sensitivity.

  • Page 3: About The Meter

    Press RESET to erase all existing data before taking new data. PRINT Button If the Model 1800 is connected to a printer via the PRINT output jack, pressing the PRINT button will send all of the current data stored in the meter to the printer.

  • Page 4: Battery Button

    RANGE Switch SLOW - 1 second time constant. (See Figure 18) The displayed range of the Model 1800 is 60 dB and is switchable between the following: 20-80 dB, 40-100 dB, 60-120 dB, or 80-140 FAST - 125 millisecond time constant. (See Figure 19)

  • Page 5: Output Jacks

    Mic. Polarization - The small ON/OFF switch on the right-hand side operates DATA - When the Model 1800 is in the RUN mode, an SPL reading will be serially transmitted through the DATA jack at a rate of 16 times the 200 volt microphone polarization which is necessary per second.

  • Page 6: Printout

    D i s p l a y T i m e T h e QUEST MODEL 1800 PRECISION INTEGRATING SOUND LEVEL METER reces DATE:_______ SERIAL NO. _______ CALIBRATED: __________ s e d LINEAR WEIGHTING / SLOW RESPONSE d i p...

  • Page 7: Checking The Meter Integrity

    When taking measurements while holding the meter in your hand, keep your arm Set the Model 1800 to LIN, SLOW or FAST, the SPL mode, and the 60- fully extended. 120 range (if using a level of 94 dB).

  • Page 8: Wind Screen Effects

    measuremen C. Wind Screen Effects To prevent erroneous measurement of sound levels caused by wind blowing across the microphone, the use of a windscreen is recommended. The wind screen will reduce wind effects and will also help protect the microphone under dusty, oily, or humid conditions.

  • Page 9: Chart Recording

    60 - 120 dB range, set NL-15 internal switch 1, position 4 to ON. Note that any range position can be set on the Model 1800 and the 60 dB span of the meter range will always correspond to the full 60 dB range on the If the meter is set to A-weighting, set NL-15 internal Switch 1, chart recorder.

  • Page 10: Technical Information

    A, B, C, or LIN.) TECHNICAL INFORMATION A. Principles of Operation The Quest Model 1800 utilizes low noise, low power analog and digital integrated circuitry to ensure long battery life, maximum stability, and superior reliability over a wide range of environmental conditions.

  • Page 11: Microphone

    B. Microphone Preamplifi The Model 1800 is designed to accept either a half-inch or one-inch Input microphone either prepolarized (electret) condenser type. Characteri prepolarized (electret) microphone does not require a polarization voltage. stics If a condenser type is used, then the 200 volt microphone polarization voltage must be turned on by a switch located in the battery compartment.

  • Page 12: Microphone Preamp Extension Cables

    50 Ft. Remote Cable. give a dB readout on the meter. Note that when interfacing other input devices to the Model 1800, the 200 The calibration level at 1kHz and below is affected by less than 0.1 dB with volt microphone polarization switch located inside of the battery compartment the insertion of a cable.

  • Page 13: Weighting Characteristics

    G. Internal Electrical Noise Weighting Characteri The maximum measurable SPL of the 1800 Meter is 140 dB with a sinusoidal stics input. (120 dB if measuring a complex signal with a 20 dB crest factor.) With optional microphones the upper range can be extended to 150 dB.

  • Page 14: Response Charts

    H. Response Charts Figures 18 through 22 are plots for each of the response settings of the meter. They show how the meter responds to a given sinewave input of varied pulse duration. SLOW RESPONSE (1000 msec time constant) Figure 18. FAST RESPONSE (125 msec time constant) Figure 19.

  • Page 15: Specifications

    SPECIFICATIONS Standards: Meets or exceeds ANSI S1.4-1983, Type 1 and relevant sections of IEC 651-1979, Type 1(I) and IEC 804-1985. Display: Digit Liquid Crystal Display with additional Quasi-Analogue 60 dB indicator in 2 dB increments. Level display indicates to 0.1 dB resolution. Time display indicates either Min:Sec or Hr:Min.
  • Page 16 Meter Input: The input impedance is 1 Megohm in series with 0.1 MFD. Level Linearity: Inside the Primary Indicator Range. It is tested on the maximum sinusoidal input voltage is 10V RMS. Reference Range (60 to 120 dB) with a sinusoidal input signal. Tolerance is +/- 0.7 dB referenced to 94 dB.

  • Page 17: Introduction To The Model Ob-100

    (in MANUAL Mode) or frequency A. Operational Check direction control (in AUTO Mode). The Model 1800 should be calibrated as outlined in the meter section of the -20 dB Button manual (Section III, B, Calibration) while the OB-100 is OFF. The OB-100 has...

  • Page 18: Taking A Measurement

    Read the calibrator 1 kHz output level. Set the meter dB RANGE Select the desired WEIGHTING and RESPONSE. Then change the dB switch so that the calibrator level will indicate within the upper RANGE switch down in 20 dB steps until the OL indicator flashes or 20 dB of the meter display.

  • Page 19: Reviewing The Data

    Model 1800 through the filters and back to the sound level stepping through each frequency. meter. Power Source: Sound Level Meter. Size: 3.3 x 2.8 x 1.8 inches (84 x 71 x 47mm)

  • Page 20: Introduction To The Model Ob-300

    XII. INTRODUCTION TO THE MODEL OB-300 The Quest Model OB-300 1/3 - 1/1 Octave Filter is a plug-in module containing selectable filters. OB-300 meets most stringent requirements of ANSI S1.11-1986 and IEC R225-1966 for octave and third octave band filters. The unit contains 33 selectable filter frequencies from 12.5 Hz to 20 kHz when in the 1/3 mode and 11 selectable filter frequencies from 16 Hz to 16 kHz when in the 1/1 mode.

  • Page 21: Mode Switch

    A. Operational Check Selects either the 1/3 octave filter set (33 frequencies) or the 1/1 The Model 1800 should be calibrated as outlined in Section III of the meter octave filter set (11 frequencies). section (Checking the Meter Integrity, B. Calibration) while the OB-300 is OFF.

  • Page 22: Manual Filter Operation

    The fc/2 and 2fc frequencies are down by approximately 50 dB. The block diagram of the OB-300 illustrated in Figure 28 traces the signal input from the Model 1800 through the filters and back to the sound level meter.
  • Page 23 SPECIFICAT IONS Stand ards: A N S I S1.11 -1986 Order T y p e Sub-t ype C a n d I E C Figure 27. Typical OB-300 Filter Response R225- 1966. Center Frequencies: (1/3 Mode) 33 frequencies from 12.5 Hz to 20 kHz. (1/1 Mode) 11 frequencies from 16 Hz to 16 kHz.

  • Page 24: Specifications

    If you receive an error message, retry the COPY command. At this point, the user should press the "PRINT" button on the 1800. Nothing will happen on the screen until all of the information has been sent. When the instrument is done sending the information, the PC will respond with "1...

  • Page 25: Downloading Using Windows

    B. Downloading Using Windows QUEST SERVICE AND WARRANTY POLICY Service Policy There is a variety of commercially available software that can easily accept data from meter. These software packages usually termed Quest product have purchased finest acoustic ® "communications software". Microsoft Windows has a communications program...

This manual is also suitable for:

Ob-100Ob-300

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