Welch Allyn AudioScope, Руководство по обслуживанию

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1.8 Technical Specifications
• Charging Stand:
Model# Application:
71123 Charging Stand for all models of AudioScope
Charging Transformers
Model#: Application:
71040 USA and Canada
71036 Australia
71032 Europe
71030 Japan
71034 United Kingdom
•
Handles:
Frequencies - 500, 1000, 2000, 4000 Hz +/- 3%
Distortion - Less than 3% total harmonic
distortion as measured at transducer input
Rise/fall times - 20 to 200 msec. as measured between the -1 and -20
dB points
Tone duration - 1.5 s/- 0.2 seconds
Pause between tones Varied between 1.0 and 2.0 seconds
Sound level - Sound levels were established by threshold loudness
balance method to TDH-39 receiver with MX41/AR
cushion per ANSI S3.6-1969 Ref. Thresholds. These
levels were established in an independent study and
are equivalent to standard audiometric headphones.
+/- 3 dB @ 500, 1000, and 2000 Hz, +/- 4 dB @ 4000
Hz.
This corresponds to the following absolute sound pressure levels when the
instrument is coupled to an occluded ear simulator per ANSI Std. No. S3.25-
1979:
Freq.
For 20 dB HL for 25 dB HL for 40 dB HL
500 28.2 - 31.6 33.2 - 36.6 48.2 - 51.6
1000 26.3 - 28.3 31.3- 33.3 46.3 - 48.3
2000 31.1 - 34.2 36.2 - 39.2 51.2 - 54.2
4000 32.0 - 35.8 37.0 - 40.8 52.0 - 55.8
Lamp - 3.5v Halogen, 20 hr avg. life
Battery - 3.5v nickel cadmium rechargeable pn72300 650
mA/hr.
Continuous use - 50 minutes (approx) between full charge