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| MIL-F-81150A(OS)
4.4.4.6.4 Adjust the oscillator frequency control until the output
voltmeter indicates the maximum voltage. Record this frequency. Then
readjust the oscillator output for 1.0 vrms, as indicated on the output
voltmeter l
4.4.4.6.5 Record the indication on the input voltmeter (the voltmeter
connected between pins 1 and 7 of the filter). Maintain this voltage at
the filter input until otherwise instructed.
4.4.4.6.6 Decrease the oscillator frequency below 7 KHz until the out-
put voltmeter indication is 3 db below 1 vrms. Record the frequency indi-
cated on the electronic counter.
4.4.4.6.7 Increase the oscillator frequency above 7 KHz until the out-
put voltmeter indication is again 3 db below 1 vrms. Record the frequency
indicated on the electronic counter.
4.4.4.6.8 Subtract the frequency recorded in 4.4.4.6.6 from the fre-
quency recorded in 4.4.4.6.7. The difference of these frequencies is the
band width of the filter. The band width shall be 2000 plus or minus 100 Hz.
4.4.4.7 To measure the center frequency as set forth in 3.4.5.
4.4.4.7.1
Repeat the procedures of 4.4.4.6.1 through 4.4.4.6.7.
4.4.4.7.2 Add the frequencies recorded in 4.4.4.6.6 and 4.4.4.6.7 and
divide the sum by two. This quotient is the center frequency of the band-
pass filter. The center frequency shall be 7000 plus or minus 75 Hz.
4.4.4.8 To measure the response as set forth in 3.4.6.
4.4.4.8.1 Set the oscillator to the frequency recorded in 4.4.4.6.4.
Adjust the oscillator output for 1 vrms on the output voltmeter.
4.4.4.8.2 Decrease the oscillator frequency below 7 KHz until the out-
put voltmeter indicates 1 db below 1 vrms. Record the frequency at which
this occurs. This frequency shall not be above 6200 Hz.
4.4.4.8.3 Increase the oscillator frequency above 7 Khz until an in-
dication of 1 db below 1 vrms is again obtained on the output voltmeter.
Record the frequency at which this occurs. This frequency shall not be
below 7800 Hz.
4.4.4.9 To measure the attenuation as set forth in 3.4.7':
4.4.4.9.1 Adjust the oscillator to the frequency recorded in 4.4.4.6.4.
Set the oscillator output to 1 vrms, as indicated on the output voltmeter.
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