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BRUEL & KJAER 1625 Instruction Manual
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BRUEL & KJAER 1625 Instruction Manual

BRUEL & KJAER 1625 Instruction Manual

1/3-1/1 octave filter set
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Instruction
1/3 - 1/1 Octave Filter Set Type 1625
Centre
R.cord#"
Sped
1/3
1=029
—
Octave
Filter
1625
Manual
A portable Band Pass Filter Set primarily in-
tended for use with Sound Level Meter Type
2230.
2231
or
2233.
Permits
frequency
analysis, and octave frequency
analysis With a Step Of octave or third-OC-
tave. Fully automatic recording of the analy-
SiS IS possible with a Level Recorder Type
2317, 2306 or Type .2309. The scanning Of
the filter and the Level Recorder are fully
controlled by the Filter Set to obtain an op-
timal recording. Two Scanning speeds are
available
for
analysis
with "Slow" or "Fast" time weighting.
The selectable centre
from 20Hz to 20kHz and a linear position
gives a frequency band from 3Hz to 75kHz.
The analysed signal may also be weighted
by selecting "A" or "C" frequency weight-
ings on the Sound Level Meter.
Brüel & Kjær
third-octave
of levels
measured
frequency range is

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Summary of Contents for BRUEL & KJAER 1625

  • Page 1 1625 Instruction Manual 1/3 - 1/1 Octave Filter Set Type 1625 A portable Band Pass Filter Set primarily in- tended for use with Sound Level Meter Type Centre 2230. 2231 2233. Permits third-octave frequency analysis, and octave frequency analysis With a Step Of octave or third-OC- tave.
  • Page 2 1/3-1/1 Octave Filter Set Type 1625 From serial no. 1032782 Revision May 1985...
  • Page 3 CONTENTS INTRODUCTION AND SPECIFICATIONS (PRODUCT DATA). CONTROLS. OPERATION... 3.1. PRELIMINARY 3.2. POWER SUPPLY ..10 ....Battery check..Battery replacement ..Mains Power Supply and Charger ZG 0254......3.3. FREQUENCY ANALYSIS..... General Measurements Third-Octave Analysis Recording. .
  • Page 4 . Cen Octave Filter Set Type 1624 and Type 1624 Third Octave/()ctave Filter Set Type 1625 are primarily designed for use with Sound Level Meters Types 2230, 2231 Brüei & Kjær and 2233 for in situ octave and 1k octave...
  • Page 5 Third Octave/Octave Filter Recommendation R 225-1966, DIN tained from Sound Level Meter Set Type 1625 are both active filters, Output, and the start/stop of paper which are small in size and light 45651 and ANSI Sl.11-1966 Classll, movement...
  • Page 6 3/3 octave analySis and Fig. 6. Top of a 1/3octave filter characteris- recording with Type 2317 or 2309 tic from the Filter Set"Type 1625 The Type 1625 contains 31 active 1/3 octave filters and 31 overlapping lh o cida@aaa a 0 a a g •go a...
  • Page 7 Specifications 1624 1625 1625 Third-Octave and Octave Filter set Type 1624 Octave Frequency Range to 22kHz (Va Oct.), 14 Hz to 2B kHz (V' oct.) 22 HZ to 22 kHz Selective Type 5 HZ to 75 kHz (-1 dB) Typical 3 HZ to 75 kHz (-1 dB)
  • Page 8 BrüeJ & Kjær Type Step Fast 1 '3 — Filtec Set Fig. 2.1. Front view of the Filter Set Type 1625 Resets the centre frequency of the filter to a preset centre frequency. RESET (Preset Enable): When connected to a Level Aecorder,...
  • Page 9 The centre frequencies are from 20 Hz to 20 kHz for both 1/3-octave and octave bands. See Table 3.1 for the 1/3 octave and preferred taves centre frequencies. When RESET (PRESET ENABLE) is pressed, the preset centre frequen- cy of the Filter set can be changed using the FILTER STEP (PRESET) "Up"...
  • Page 10 "Recording On" For use when connected to a Level RecorderÄÄn row on the display flashes quickly when recording a frequency band (recording paper moving) and when the Filter Set controls the Record- er. During the filter settling time (paper not moving) the arrow flashes quickly when RECORDING SPEEDis set to "Fast", and slowly when set to "Slow"...
  • Page 11 Fig. 2.5. Side view of the Filter Set Battery drawer which accepts four 1,5 V alkäline cells (IEC type LR6, BATTERY DRAWER: AA size). These are connected in parallel with the batteries in the Sound Level Meter (see section 3.2). This drawer can be replaced by the drawer fitted with rechargeable cells supplied with the Mains Pow- er Supply and Charger ZG 0254 (optional extra).
  • Page 12 3. OPERATION 3.1. PRELIMINARY The Type 1625 and the Sound Level Meters Type 2230 or 2233 have'•matching 15-pin push-fit connectors which facilitate direct coupling of the instruments to form one com- pact unit. (See Fig.3.I). To attach the Filter Set to the Sound Level Meter, press the two side-locks and engage the connectors.
  • Page 13 Fig.3.2. MountingtheFilterSet on theSoundLevelMeter Type2230or 2233 3.2. POWER SUPPLY 3.2.1. Battery Check TheFilter Set is poweredvia the particularSoundLevelMeterconnected. T hebatteries contained in the Filter Set are not used to power the Filter Set directly, but to increase the capacity of the Sound Level Meter's power supply and to retain the preset start frequencyand the currentcentrefrequencyof the Filter Set whenit is switchedoff or unplugged from the SoundLevelMeter.Whenusingwith SoundLevelMeterType2230 or 2233 and alkaline batteries are fitted, the battery life is approximately 10 hours.
  • Page 14 Fig. 3.3. Battery replacement 32.3. Mains Power Supply and Charger ZG0254 (option) The battery drawer of the ZG 0254, containing 4 rechargeable- cells, fits into the Filter Set Type 1624 and can be recharged either in or outside the instrument via the socket on the side.
  • Page 15 3.3. FREQUENCY ANALYSIS In the following sections emphasis is placed on the practical aspects of performing 1/3 octave and octave analysis with the 1625. For a comprehensive theoretical understand- ing of frequency analysis, the book "Application of B&K Equipment to Frequency Analy- sis"...
  • Page 16 Type 2306 Level Recorders use cable AQ 0182 (see section-3.3.4.). Level Recorder Sound 2317 (Ot 2306) Meter 2230 : A00173 Rerncte Control AQ0034(or.AQZ182) Octave Fitter 1625 Two Channel Level Recorder 23CS Fig. 3.6. Set-ups for automatic 1/1and 1/3octave analysis and record- ing with Type 2317 or 2309...
  • Page 17 Set the Sound Level Meter as described in section 3.3. I. Set the controls on the Filter Set as follows: "1/3-1/3" STEP SIZE-BANDWIDTH: "Slow" or "Fast"; corresponding to the selected RECORDING SPEED: TIME WEIGHTING on the Sound Level Meter Lin recordings) or on the Level Recorder (AC Log recordings)
  • Page 18 Set the Level Recorder as follows RECORDING MODE: "DC Lin" WRITING SPEED: "250 mm's" ("100 mm/s" when using Type 2231) PAPER SPEED: "Ext." POWER: PAPER DRIVE: PEN DRIVE: RecordingsWiththe Level RecorderType 2309are similar to thosewith the Type 2306. Proceed with recording of the frequency analysis, -as outlined below. Recording the frequency analysis: Place the recording paper before the corresponding centre frequency printed on...
  • Page 19 1/3 Oct. 1/3 Oct. V3 Oct. 1/3 Oct. Centre Centre Centre Centre B.W. B.W. B.W. B.W. Frequency Frequency Frequency Frequency 3,7 dB 3,7 dB 3,7 dB Hz approx. Hz approx. Hz approx. Hz approx. 1,25 k 2300 1.6k 12,5 k 2900 31,5 16 k...
  • Page 20 xd.Z2.l.Z— Fig. 3.9. Octave analysis With octave Step size A 1/3-octave analysis will give band-edgelines spaced by 5 mm (1/3' Oct.)and a "Lin." response 5 mm wide. An 1/1octave analysis with 1/3octave step size will.give band-edge lines spaced by 5 mm (1/3) and a Lin.
  • Page 21 The Recorder starts the filter scanning. When the "Lin." frequency band is reached the paper stops moving. Do not set PAPER DRIVE "Off". Position the paper so the pen ties 2 mm before the graduation on the paper correspondingto the starting filter centre frequency for 1/1 or 1/3octave analysis in 1/3octave steps.
  • Page 22 Fig. 4. I. Block diagram of 'the 1625 Filter Set SPL. + 20 Electrical Noise inci- {herma[noise of microphene Electricat Noise 31.5 125. Fig. 4.2. Inherent noise level of 2230/33 Sound Level Meters with the 1625 Filter Set for octave analysis...
  • Page 23 Electrical Noise 31.5 Frequency Fig. 4.3. Inherent noise level of 2230/33 Sound Level Meters with the 1625 Filter Set for 1/3 octave analysis Phase -2/6-1/6 oct. Fig. 4.4. Input/Output phase shift due to the Filter...
  • Page 24 For repair consult the separate Service Instruction Manual available for the Type 1625 or contact your local B & K service representative. Under *no circumstances should repair be at- tempted by persons not qualified in the service of electronic instrumentation.
  • Page 25 1625 8ä"ä.8' 1550 dßE5e Brüel & Kjær DK-2850 NÆRUM. DENMARK • Telephone: + 45 2800500 • Telex: 37316 bruka dk EngliSh DK BE0756-12 pnnted in Denmark by Nærum Offset...