29
Meter Input: The input impedance is 1 Megohm in series with 0.1 MFD. The
maximum sinusoidal input voltage is 10V RMS.
AC Output: 3.16 V RMS at full scale (60 dB). (3.8 V RMS maximum) The output
impedance is 3.2K ohms. Connected equipment should be at least 10K ohms.
The output can be shorted without damaging the meter or changing the meter
reading.
DC Output: 0 to 1.00V DC; 60 dB span. Each 0.167V change equals 10 dB.
Connected equipment should be at least 10K ohms. The output can be shorted
without damaging the meter or changing the meter reading.
Print Output: Serial output to printers or computers using RS-232 voltage
levels. Selectable baud rates of 300, 600, 1200, or 2400. ASCII character
format.
Data Output: Output transmission of real-time digital data occurs at a rate
of 16 times per second using RS-232 voltage levels.
Frequency Range: 4 Hz (-3dB) to 50 kHz (-3dB) on linear weighting, meter
only. (Subject to microphone limitations.)
Reference Range: 60 to 120 dB Range setting
Reference SPL: 94 dB
Reference Frequency: 1 kHz
Reference Direction: 0 Degree when using a Free Field Microphone. Sound is
arriving from directly in front of the microphone diaphragm. (A Normal Line
extending from the center of the microphone diaphragm.)
Detector: True RMS
Detector Pulse Range: 63 dB
Detector Measuring Range: From 0 dB to 40 dB on the painted scale (when
measuring a signal with a 20 dB Crest Factor). The extra 20 dB (40 to 60) on
top of the measuring range produces the 20 dB Crest Factor capability .
Primary Indicator Range / Linearity Range: 60 dB (The range as indicated by
both the dB RANGE switch and the painted 60 dB scale.) Tested with a
sinusoidal signal input.
30
Level Linearity: Inside the Primary Indicator Range. It is tested on the
Reference Range (60 to 120 dB) with a sinusoidal input signal. Tolerance is
+/- 0.7 dB referenced to 94 dB.
Overload Indication: The display annunciator (OL) indicates overload on the
LCD.
Attenuator Accuracy: Referenced from the Reference Range and the Reference
SPL (+34 dB on the painted meter scale). Within 0.5 dB from 31.5 Hz to 8
kHz. Within 1.0 dB from 20 Hz to 12.5 kHz.
Warm-up Time: 30 seconds.
Integration Time (Settling Time): 1 minute when measuring a short impulse.
5 seconds when integrating a constant input signal.
Accuracy: Within 0.5 dB at 25
o
C; Within 1.0 dB over the temperature range of
-10
o
C to +50
o
C.
Temperature Range: Operation Temperature Range: -10
o
C to +50
o
C. Accuracy
over the Operation Temperature is within +/- .5 dB. Storage Temperature
Range (less batteries): -20
o
C to +60
o
C
Do not exceed the Storage Temperature Range because possible damage to the
unit may result.
Operating Humidity: Over a range of 30 to 90% relative humidity, the
accuracy is within +/- 0.5 dB. Do not exceed 95% relative humidity because
possible damage to the unit may result.
Effect of Magnetic Fields: A magnetic field of 1 Oersted (80A/m) at 60Hz
produces a maximum reading of 40 dB on Linear Weighting.
Effect of Electrostatic Fields: Negligible as long as the protection grid is
kept on the microphone.
Batteries: Two 9-volt alkaline batteries (NEDA 1604A) will provide
approximately 16 hours of continuous operation. (8 hours with optional filter
set.)
Tripod Mount: A threaded insert on back of the meter accepts a standard
1/4-20 tripod mounting screw.
Size: 3.3 x 8.2 x 1.8 inches (84 x 208 x 47mm) not including the height of
the preamp.
Weight: 24 oz. (680g) including the preamp and batteries.
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