Tektronix AA 501 - OPERATING INSTRUCTIONS; Filter Response Curves

Add to page 2-11, after the last paragraph on the page:
. . .standards for class 1 sound level meters.
Opfion 02 iruXtwnent2 ptovidu CClR lrrTG and 22.4 Hz Ro 22.4 kHz uru~oigkted
tuporue li.mh2. Thue cvre hhown in Fig. 2-9. The CClR WTG tuponise a hub-
jective rrenpome Qot no&e meuunemenh in audio equipment.
The 22.4 Hz to
22.4 kHz tupome &ix2 me enhentay dCCLt drrom 30 Hz to 16 kHz.
Fig. 2-9. Response curves for AA 501 filters.
Fig. 2-9.
Response curves for AA 501 filters.
(Tkiil dig une tepLacu Fig. 2- 9 in Xhe manud. l
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