MIL-DTL-55041F
4.7.11 Isolation (see 3.13). Connect the equipment as illustrated in figure 5. The characteristics of the low pass
filter shall be such that it will attenuate all harmonics of the RF signal for at least 30 dB. Set the start/stop limits on
the sweep oscillator to the specified lowest and highest frequency values, respectively. Connect the calibrated
mismatch to the output of the network analyzer. Adjust the horizontal sensitivity of the X-Y recorder for 10 inches of
travel and using the sweep oscillator sweep output signal, set the sweep width for the same value. Adjust the RF
power level on the sweep oscillator to a level that will provide the best detection efficiency for the detector. With the
sweep oscillator adjusted and the network analyzer and X-Y recorder calibrated, draw calibration lines in 1 dB step
above and below the specified isolation value of the switch on the X-Y recorder. Remove the calibrated mismatch
and insert the switch under test. Terminate all unused ports with matched loads. With the switch at room ambient
temperature, apply the nominal operating voltage and record the isolation versus frequency on the recorder. The
frequency shall be labeled and recorded at not less than 5 equally spaced points evenly distributed across the
frequency band. Repeat the above procedures for any other adjacent ports. If the test must be made at fixed
frequencies, the test shall be made at not less than 7 equally spaced points evenly distributed across the band width
of the switch. The overall inaccuracy of isolation measurements shall be no greater than 5 percent. A means shall
be provided for producing a permanent record of the switch's isolation versus frequency if fixed frequencies or other
than the above test setup is used.
4.7.12 Voltage standing wave ratio (see 3.14). With the switch at room ambient temperature, apply nominal
operating voltage and measure the VSWR for each RF path across the specified range, using the test setup of
figure 6. Relatively low RF input power shall be used for this test. Each unused port shall be terminated in a
matched load. A means shall be provided for producing a permanent record of the switch's VSWR versus frequency.
The VSWR shall be recorded in increments of 0.05 between VSWR limits of 1.02:1 and 1.5:1 and 0.1 above 1.5:1. If
the test must be made at fixed frequencies, the test shall be made at not less than 7 equally spaced points evenly
distributed across the bandwidth of the switch. If VSWR is not directly measured; that is, if return loss is measured
and VSWR calculated from that measurement, the permanent record shall indicate the worst case VSWR numerically
and shall provide the calculation used to obtain the calculated VSWR. The measurement system and permanent
record shall provide a minimum accuracy of .04 over the frequency ranges below 26.5 GHz and a minimum accuracy
of .08 over the frequency ranges 26.5 GHz and above.
4.7.13 Insertion loss (see 3.15). With the switch at room ambient temperature, apply nominal operating voltage
(see 3.1) and measure the insertion loss for each RF path, using the general test procedures and test setup of 4.7.11.
The calibration lines on the recorder shall be .02 dB step above and below the specified insertion loss value. The
measurement system and permanent record shall provide a minimum accuracy of .04 dB over the frequency ranges
below 26.5 GHz and a minimum accuracy of .08 dB over the frequency ranges 26.5 GHz and above.
4.7.14 Switching time (see 3.16). For electrically operated switches, the switching time from both the energized
and deenergized positions shall be measured, using the test setup of figure 3. With the switch at room ambient
temperature, apply RF and dc power and measure the time lapse between application of dc actuator power and final
positioning of the RF portion of the switch for the position selected. Measure the time lapse for the switch to go from
an energized position to a de-energized position. Repeat these tests for each electrically selected position of the
switch.
4.7.15 RF energy leakage (see 3.17). Using the test setup shown in figure 7, the input of the switch shall be
furnished with a minimum of 10 milliwatts of RF power at the center frequency of the switch pass band. Each output
port shall be terminated in a matched load. The entire external surface of the switch shall be explored for maximum
RF leakage. This test shall be repeated for each switch position. The maximum RF leakage shall be no higher than
specified (see 3.1).
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