MIL-STD-220 Method Of Insertion Loss MeasurementThis standard covers a method of measuring, in a 50 ohm system, the insertion loss of feed-through suppression capacitors, and of single and multiple circuit radio frequency RF filters at frequencies up to 10 gigahertz GHz.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19

MIL-STD-220C

3.  DEFINITIONS

3.1  Insertion loss.  At a given frequency, the insertion loss of a feed through suppression capacitor or a filter connected into a given transmission system is defined as the ratio of voltages appearing across the line immediately beyond the point of insertion, before and after insertion. As measured herein, insertion loss is represented as the ratio of input voltage required to obtain constant output voltage, with and without the component, in the specified 50 ohm system.  This ratio is expressed in decibels (dB) as follows:

Insertion loss  =  20 log E1

E2

Where:

E1  = The output voltage of the network/spectrum analyzer with the component in the circuit.

E2  = The output voltage of the network/spectrum analyzer with the component not in the circuit.

When testing is conducted with a network/spectrum analyzer, the equipment usually maintains a constant output voltage and can be set to record the output to input voltage ratio in decibels.

NOTE:  The network/spectrum analyzer will provide a direct reading of loss. There is no need to do any conversion of voltage readings.

2