Am5(E) Classic Instruction Manual; Filter (Left Key) - AMERITECH AM5 Instruction Manual

AM5(e) Classic Instruction Manual

3.3.17 FILTER (left key): This key can select six filters and RMS detection for use
with the MEASURE NOISE functions of an AM5 Classic (as shown in Figure 3-
1) and five filters and RMS or Quasi-Peak detectors for an AM5e Classic (shown
in Figure 3-2). Filters are selected in rotation each time the key is pressed, and
the selection is indicated by the lighting of the LED adjacent to the abbreviation
for the measurement.
For the AM5 Classic the selections are:
• CMSG
• PGM
• 3 KHz
• 15kHz
• 50kBit
• WIDE
For the AM5e Classic the selections are:
• PSHO
• UNWTD Q PEAK
• SWTD Q PEAK
• UNWTD RMS
• SWTD RMS
• 2kHz FLAT
• WIDE
NOTE: When MEASURE selection is LEVEL/FREQ or L/F 15 kHz on an AM5
Classic (LEVEL/FREQ or L/F UNWTD for AM5e Classic), none of the above filters
can be selected. However, the L/F 15 kHz (L/F UNWTD) selection places a low pass
filter into the measurement circuits to eliminate high frequencies which are not of
interest or when high-frequency signals (in addition to Voice Frequencies) on the
line could give false readings. Filters are described in detail in Section 7 for the AM5
Classic, and in Section 8 for the AM5e Classic.
3.3.18 FILTER (right key): This key selects a 60 Hz filter; the 60 Hz LED is lighted
when the filter is selected. The 60 Hz filter can be selected in addition to any other
filters, and is useful when making measurements on circuits that have power-line
interference. This filter cuts off frequencies below 60 Hz, and so also applies to 50
Hz or 25 Hz power-line interference. If the LEVEL or FREQuency measurement
display is not steady, there may be an improvement when this function is ON.
• OFF (LED not lighted) is the default.
November 19, 1997
(18-0047)
(C-Message Bandpass)
(Program Bandpass)
(3 kHz flat)
(15 kHz flat)
(Low Pass and High Pass)
(20 Hz to 120 kHz) for standard units or
(20 Hz to 160 kHz) for 200 kHz units
(Psophometric Bandpass)
(Sound Unweighted Quasi-Peak detection)
(Sound Weighted Quasi-Peak detection)
(Sound Unweighted RMS detection)
(Sound Weighted RMS detection)
(2 kHz flat)
(20 Hz to 120 kHz) for standard units or
(20 Hz to 160 kHz) for 200 kHz units
Page 3-11
DESCRIPTION