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Validation Report

APPENDIX E: INSTRUMENTATION SYSTEM REFERENCE

E.1 Instrumentation List

B&K Deltatron Microphone System:

• Model 4155 or 4189 ½-in Electret Condenser Microphone
• Model 2671 Deltatron Preamplifier
• Model WB 1372 Deltatron Power Supply
• Custom-fabricated BNC to XLR adapters
• Custom-fabricated 4-conductor 100 ft (~30 m) or 300 ft (~90 m) shielded XLR microphone cables

Spectrum Analyzer (LDL 2900):

• LDL Model 2900 Spectrum Analyzer

Sound Level Meter (LDL 820):

• LDL Model 820 Sound Level Meter

Digital Audio Tape (DAT) Recorder:

• Sony Model TCD-D100 DAT Recorder

Ancillary:

B&K Model 4231 Sound Calibrator
½-in Microphone Simulator (Dummy Microphone)
Ivie IE-20B Pink Noise Generator
17 Ah Gel-Cell Battery or 40 Ah Gel-Cell Battery
Tripod (with extending pole or mast for high positions)
Watch to serve as Master Clock

E.2 Configuration

LDL Model 2900 Spectrum Analyzer:

• Range settings - Normal calibration at 114 dB SPL will automatically set the input range to 120 dB.  The range stays at 120 dB for pink noise and is changed to 60 dB for testing the noise floor with the microphone simulator.  The input range also changes for data collection (usually to 100 dB for highway traffic noise).  All such changes are logged.
• Data settings - For calibration, the LDL 2900 set-up has the following features: dual channel, linear 20 Hz to 10 kHz weighting on input, and 0.5-second Leq.  For data collection, the LDL 2900 set-up has the following features: dual channel, A-weight filter on input, and 5-second Leq.

LDL Model 820 Sound Level Meter:

• Data settings - The LDL 820 set-up has the following features: A-weight filter on input and 5-second Leq.

SONY Model TCD-D100 DAT Recorder:

• Mode - Operate the Sony TCD-D100 in "LP" (half-speed) mode; the sample rate is 32 kHz.  In this mode, the tape duration is approximately four hours.
• Range - Calibrate using the 114 dB 1 kHz tone; set the gain at -6 dB VU, allowing a dynamic range of about 40 to 120 dB.

E.3 Operation

Set-up:

• Run microphone cable and connect between B&K Model 2671 Deltatron preamplifier and B&K Model WB 1372 Deltatron power supply.  Note: Custom-fabricated BNC-to-XLR adapter cables are required at both ends of the microphone cable.
• Interconnect equipment per Figures C.1, C.2, and C.3.
• Set time and date on the LDL 2900 Spectrum Analyzer, LDL 820 Sound Level Meter, and Sony TCD-D100 DAT Recorder per Master Clock.
• Check instrument settings.

Calibration:

• Remove foam windscreen from microphone.
• Carefully apply calibrator to microphone.
• Carefully apply power to calibrator (114 dB setting).
• Wait ten seconds for system to stabilize.
• Perform calibration of LDL Model 2900.
• Perform calibration of the LDL 820 SLM and the Sony TCD-D100 DAT recorder.  On the Sony TCD-D100, record the calibration signal for at least 30 seconds; this duration allows an ID marker to be written.  A normal calibration will illuminate 8 segments on the Sony Model TCD-D100 display.
• After recording the calibration signal, turn off the calibrator and remove it from the microphone.
• Remove the microphone from the B&K Model 2671 Deltatron preamplifier.
• Attach the Ivie IE-20B Pink Noise Generator to the B&K Model 2671.
• Capture and record 30 seconds of the pink noise.
• Remove the Ivie IE-20B Pink Noise Generator from the B&K Model 2671.
• Attach the ½-in microphone simulator to the B&K Model 2671.
• Capture and record 30 seconds of microphone simulator floor.
• Remove the microphone simulator, and re-install the microphone.
• Attach the calibrator to the microphone.
• Apply power to calibrator (114 dB setting).
• Wait ten seconds for calibrator signal to stabilize.
• Check calibration level of the LDL Model 2900.
• Check calibration level of the LDL 820 SLM and record the calibration signal on the DAT recorder for a minimum of 30 seconds.
• After recording the calibration signal, turn off the calibrator and remove it from the microphone. Attach the foam windscreen.
• The acoustical system is ready for initiation of measurements.

E.4 System Performance Limits

System Performance Limits

E.5 Power Requirements

B&K Model WB 1372 Deltatron Power Supply:

• 3 x 9V cells
• Typical "life": >> 40 hours on a set of 9V cells

LDL Model 2900: 

• 12 V (~ 1 A)
• Typical "life": 40 hours powered by gel-cell

LDL Model 820:

• 1 x 9V cell
• Typical "life": 20 hours on one 9V cell

SONY Model TCD-D100:

• 2 x AA cells or 4.3 V
• Typical "life": up to 7 hours on a set of Lithium AA cells, but must be checked regularly

B&K Model 4231 Calibrator:

• 4 x AA cells