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128
Appendix A
Octave filters (optional)
Number of bands ~ Eleven bands, with center frequencies (f
16 Hz to 16 kHz. The octave filters are flat within < 0.3 dB in each passband.
The half-power points are at 0.707 f
Octave skirts ~ With respect to f
Third-octave filters (optional)
Number of bands - Thirty-three bands, with center frequencies from 12.5 Hz
to 20 kHz. The 1/3 octave filters are flat within <0.3 dB in each passband.
The half-power points are at 0.89 f
Third-octave skirts ~ With respect to f
approximately 50 dB down.
Instrument noise
Noise floor depends upon which microphone is being used. The following
measurements are for a typical instrument, with the 059-703 adapter (18 pF)
connected to the preamp and shorted at the BNC end. This condition closely
simulates the noise floor of a ½-inch microphone. For these measurements,
the instrument was set to the lowest range and to a slow response time.
Environmental effects
The typical time interval needed to stabilize after changes in environmental
conditions is 5 minutes for each 10 C change.
Temperature
Operating - Less than ±0.5dB effect over -10
Storage - 25
•
/2 frequencies - Approximately 20 dB down.
f
c
•
frequencies - Approximately 30 dB down.
2f
c
•
/10 frequencies - Approximately 70 dB down.
f
c
•
frequencies - Approximately 95 dB down.
10f
c
•
22 dBA.
•
30 dBC.
•
35 dBZ.
40 dBF.
•
o
o
C to 70
and 1.414 f
c
:
c
and 1.12 f
c
, the f
c
o
o
C (-13
F to 158
F).
) ranging from
c
.
c
.
c
/2 and 2f
frequencies are both
c
c
o
o
o
C to 50
C (14
F to 122
Models SE and DL
o
F).
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