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AM5(e) Classic Instruction Manual
8.2
60 Hz FILTER
The 60 Hz high-pass filter is provided to eliminate frequencies of 60 Hz or lower.
Power line interference due to 60 Hz, 50 Hz or lower components may cause erratic
readings on the display. Connect this filter to eliminate interference as follows:
1.
Press right filter key so 60 Hz LED is lighted to connect the filter.
2.
Press right filter key again to disconnect the filter; 60 Hz LED is not
lighted.
8.3
L/F UNWTD MEASURE FILTER
When the MEASURE L/F UNWTD function is selected, a low-pass filter is connected
to the front end of the measurement circuitry, effectively eliminating high-frequency
components. The characteristics of this filter are the same as those shown in Figure 8-2.
NOTE: As is the case with the MEASURE LEVEL FREQ function, average
detection is used with the MEASURE L/F UNWTD function.
None of the Noise Weighting Filters, previously described and illustrated in sub-
section 8.1, can be selected when L/F UNWTD or LEVEL FREQ functions are being
used.
November 19, 1997
(18–0047)
AM5e CLASSIC FILTERS
Page 8-7
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