Section 5 Maintenance
5-10
5-44. 400 Hz High-Pass Filter Accuracy. Perform the
test as follows:
a. Set the Source to a frequency of 1 kHz and a level
of 2 volts.
b. Enable the Analyzer level ratio mode and depress
the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range.
d. Enable the 400 Hz high-pass filter and adjust the
Source frequency for an ANALYZER display indication of
-3.01 dB ± 0.05 dB.
e. Check the frequency against the specified limits
and record the result, pass or fail, in Table 5-12.
5-45. AUDIO Band-Pass Filter Accuracy. Refer to
paragraph 5-43 for the test connections and perform the
test as follows:
a. Set the Source to a frequency of 1 kHz and a level
of 2 volts.
b. Enable the Analyzer level ratio mode and depress
the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range.
d. Enable the AUDIO band-pass filter and set the
Source frequency to 22.4 Hz and fine adjust the
frequency for an ANALYZER display indication of -3.01
dB ± 0.05dB.
e. Check the frequency against the specified limits
and record the result, pass or fail, in Table 5-12.
f. Set the Source frequency to 22.4 kHz and fine
adjust the frequency for an ANALYZER display indication
of -3.01 dB ± 0.05 dB.
g. Check the frequency against the specified limits
and record the result, pass or fail, in Tble 5-12.
5-46. CCITT Filter Accuracy. Refer to paragraph 5-43
for the test connections and perform the test as follows:
a. Set the Source to a frequency of 800 Hz and a
level of 2 volts.
b. Enable the Analyzer level ratio mode and de-
press the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range and special function 71 to select the average
detector.
d. Enable the CCIR band-pass filter and set the
Source to the frequencies listed in Table 5-16 and record
the results, pass or fail.
5-47. CCIR Filter Accuracy. Refer to paragraph 5-43
for the test connections and perform the test as follows:
a. Set the Source to a frequency of 2000 Hz and a
level of 2 volts.
b. Enable the Analyzer level ratio mode and de-
press the dB key.
c. Enter special function 12 to hold the 1.5 volt input
range and special function 71 to select the average
detector.
d. Enable the CCIR band-pass filter and set the
Source to the frequencies listed in Table 5-17 and record
the results, pass or fail.
5-48. A, B, and C Weighting Filter Accuracy. Refer to
paragraph 5-43 for the test conditions and perform the
test as follows:
Set the Source to a frequency of 1000 Hz and a level of 2
volts.
Enable the Analyzer level ratio mode and depress the dB
key.
Enter special function 12 to hold the 1.5 volt input range.
d. Enable the A, B, or C Weighting filter and set
the Source to the frequencies listed in Table 5-18, 5-19
or 5-20 for the respective A, B, or C weighting filter and
record the results, pass or fail.
5-49. C-MESSAGE Filter Accuracy. Refer to
paragraph 5-43 for the test connections and perform the
test as follows:
Set the Source to a frequency of 1000 Hz and a level of 2
volts.
Enable the Analyzer level ratio mode and depress the dB
key.
d. Enable the C-MESSAGE weighting filter and set the
Source to the frequencies listed in Table 5-21 and record
the result, pass or fail.
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