MIL-PRF-49164C(CR)
eout = rms output voltage
Failure to meet requirements of 3.5.3 shall constitute failure of this test.
4.5.4 Gain control. Gain control range shall be measured using the test setup of 4.5.3 and
the requirements of 3.5.4. Gain control voltages 1 and 2 shall be varied from -3.5 Vdc to +3.5
Vdc for high power mode while the output is being monitored with a voltmeter. Gain control
range shall be determined from the difference in observed output voltages (gain shall be reduced
by 30 dB). Failure to meet requirements of 3.5.4 shall constitute failure of this test.
4.5.5 Signal bandwidth. The signal bandwidth shall be per 3.5.5. Gain control voltages
shall be set for a postamplifier gain of 18,000 v/v. The upper 3 dB frequency of the amplifier
shall be measured by increasing the frequency of the signal generator beyond the midband
reference of 1 kHz until the output voltage measured is down 3 dB.
4.5.6 Input impedance. Input impedance shall be measured using a signal generator with a
50 ohm source resistance and a 30 V RMS sinusoidal signal set at the postamplifier midband
frequency of 1 kHz. The input and output voltages shall be monitored simultaneously. The
output signal shall be attenuated by inserting a resistor in series with the input signal. The input
impedance shall be the value of the resistance required to attenuate the output to 50 percent of the
initial value. Failure to meet requirements of 3.5.6 shall constitute failure of this test.
4.5.7 Output current. The output current shall be measured for each channel using a 470
ohm resistive load. The postamplifier shall be biased in accordance with the requirements of
3.5.8. The IR level shall be -0.4, ±0.1 Vdc. The postamplifier input signal shall be increased
from 30 mVRms at midband frequency until the output signal begins to saturate. Failure to meet
requirements of 3.5.7 shall constitute failure of this test.
4.5.8 Input power. Input power shall be determined by measuring supply current and
supply voltage. Postamplifier output load shall be 470 ohms. Postamplifier level control shall be
set at -0.4, ±0.1 Vdc. Failure to meet requirements of 3.5.8 shall constitute failure of this test.
4.5.9 Output impedance. The output impedance shall be measured using the test setup of
4.5.6. An input signal of 30 V rms at 1 kHz shall be injected directly into the postamplifier while
the no-load-resistance output is monitored. The output signal shall be attenuated by adding a
load resistor to the output. The output impedance shall be the value of the load resistor required
to attenuate the signal to 50 percent of its unloaded value. Failure to meet requirements of 3.5.9
shall constitute failure of this test.
4.5.10 Recovery time. Recovery time shall be measured with a pulse generator with a
source resistance of 10 ohms and a postamplifier output load of 470 ohms. The pulse V1(T1),
shall be injected into the postamplifier input, with an amplitude V1 of 1 volt and a width T1 of 50
milliseconds followed by pulse V3(T3) with an amplitude V3 of 50 mV and a duration of 10
milliseconds. The postamplifier output of V1 (T1) is V'1 and the output from V3 (T3) is V'3. The
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