A-A-50728 Frequency Selective Levelmeter And Spectrum Display FslsdThis Commercial Item Description CID describes a frequency selective levelmeter and frequency selective levelmeter with spectrum display. This CID is meant as a minimum requirement for the equipment, in either configuration, and only those manufacturers that meet or surpass the requirements herein are qualified per this CID. The frequency selective levelmeter and/or spectrum display is referenced as a FSLSD, the equipment, or the test equipment.

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A-A-50728A

Noise mode

75 Hz Bandwidth

10 KHz to 100 KHz

-99 dBm to -10 dBm ±0.40 dB

-109 dBm to -99 dBm ±0.90 dB

100 KHz to 18.6 MHz

-99 dBm to -10 dBm ±0.25 dB

-109 dBm to -99 dBm ±0.35 dB

18.6 MHz to 25MKHz

-99 dBm to -10 dBm ±0.30 dB

-109 dBm to -99 dBm ±0.50 dB

Noise mode 0°C to 45°C ±0.10 dBm additional

124, 135, 600 ohms

25°C to ±5°C ±0.10 dB in addition to 75 ohms

0°C to ±45°C ±0.15 dB in addition to 75 ohms

3. Input.

a. Impedance. The equipment shall have four values of input impedances. They shall be

75 ohms in the Unbalanced state and 124, 135, and 600 ohms in the Balanced STD Unit state. All four values shall be push button selectable and shall be mounted on the front panel.

b. Return loss. Return loss for the equipment shall equal or better the following: Tone mode 75 ohms

-79 dBm to +10 dBm 30 dB

-89 dBm to -79 dBm 2 dB Noise mode

-89 dBm to +10 dBm 30 dB

-99 dBm to -89 dBm 20 dB

Tone mode 124, 135, and 600 ohms

-79 dBm to +10 dBm 30 dB except for 1st octave of frequency range

27 dB including 1st octave of frequency range

-89 dBm to -79 dBm 20 dB Noise mode 124, 135, and 600 ohms

-89 dBm to +10 dBm 30 dB except for 1st octave of frequency range

27 dB including 1st octave of frequency range

-99 dBm to -89 dBm 20 dB