Quest 1700 (Type 1) and 2700 (Type 2) Impulse
Sound Level Meters are the base models within
our Advanced Series of meters.
meters are designed to provide you with a measurement
of Sound Pressure Level (SPL) and maximum SPL
for a variety of combinations of user-selected
response time constants, frequency weightings,
measurement ranges and optional octave band
1700 / 2700 Technical Specifications
Model 1700 : Type 1
Model 2700 : Type 2 ANSI S1.4-1983, IEC 651-1979.
3-1/2 Digit Liquid Crystal Display with an additional
Quasi-Analog 60 dB indicator in 2 dB increments.
Level display indicates to 0.1 dB resolution.
Indicators are included for Battery Check, Hold,
and Overload Indication.
Modes of Operation:
Measures Sound Pressure Level (SPL) and Maximum
Level (MAX). Peak Level (PEAK) and Impulse Level
(IMP) can also be measured.
Model 1700 Meter only; With Model BK4936 Microphone
-- 27 dBA.
Model 2700 Meter only - 35dBA. Using Linear
Weighting with an Octave Filter Set. The minimum
measurement varies depending on the filter frequency
With Model BK4936 or QE7052 Microphone -- 120
dB with 20 dB Crest Factor. (140 dB if measuring
a sinusoidal signal.) Overload indication will
occur if upper range is exceeded. Optional microphones
for model 1700 will shift the measurement range
Frequency Weighting Networks:
A, B, C, and Linear. When using a filter set,
any one of the weightings may be selected.
Slow, Fast, Impulse, and Peak. (The Peak onset
time constant is less than 50 microseconds).
Peak measurements may be made in either A, B,
C, or Linear Weighting.
Removable precision 1/2 inch prepolarized condenser
(electret) microphone is standard. Optional
1/2 inch, one inch, and other microphones are
available for the model 1700 only.
Directly accepts 0.52" microphone, other
sizes with proper adapter. Removable preamp
will drive up to 100 feet of cable with negligible
Model 1700: Preamplifier model 056-856. The
is greater than 1 Gohm in parallel with 2 pF.
Model 2700: Preamplifier model 056-852. The
is greater than 1 Gohm in parallel with 47 pF.
Polarization (1700 only):
Regulated 200 V DC within 2% for use with air-
condenser microphones. The voltage must be switched
off when using prepolarized (electret) condenser
The input impedance is 1 Megohm in series with
0.1 MFD. The maximum sinusoidal input voltage
is 10V RMS.
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.
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
4 Hz (-3dB) to 50 kHz (-3dB) on linear weighting,
meter only. (Subject to microphone limitations.)
60 to 120 dB Range setting
0o when using a Free Field Microphone. Sound
is arriving from directly in front of the microphone
Detector Pulse Range:
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.
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 for model 1700, +/- 1.0
dB for model 2700.
OL appearing in the display indicates overload.
Referenced from the Reference Range and the
Reference SPL (+34 dB on the painted meter scale).
Model 1700: Within 0.5 dB from 31.5 Hz to 8
kHz. Within 1.0
dB from 20 Hz to 12.5 kHz.
Model 2700: Within 0.7 dB from 31.5 Hz to 8
Model 1700 : Within 0.5 dB at 25oC; Model 2700
within 0.7 dB at 25oC. Both models: Within 1.0
dB over the temperature range of -10oC to +50oC.
Operation Temperature Range: -10°C to +50°C.
Accuracy over the Operation Temperature is within
+/- 0.5 dB. Storage Temperature Range (less
batteries): -20°C to +60°C
Do not exceed the Storage Temperature Range
because possible damage to the unit may result.
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
Effect of Electrostatic Fields:
Negligible as long as the protection grid is
kept on the microphone.
Two 9-volt alkaline batteries (NEDA 1604A) will
provide approximately 20 hours of continuous
operation. (10 hours with optional filter set.)
A threaded insert on back of the meter accepts
a standard 1/4-20 tripod mounting screw.
3.3 x 8.2 x 1.8 inches (84 x 208 x 47mm) not
including the height of the preamp.
24 oz. (680g) including the preamp and batteries.