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

11.  Time base output. The equipment shall provide a time base output from the rear panel. Frequency shall be 10 MHz with a level of -10 dBm ±4 dB into 50 ohm impedance.

12.  Meter. The equipment shall have a meter located on the front panel to measure level.

a.        Scale. The meter shall have both a normal and an expanded scale. Normal scale shall be from +2 dBm to -20 dBm and the expanded scale shall be from -1.0 dBm to +1.0 dBm. Minimum resolution on the expanded band shall be 0.05 dB.

b.        Linearity. The meter shall have a linearity error of less than ±.02 dB in the expanded scale and less than ±0.1 dB from +2 dBm to -10 dBm and less than ±0.7 dB from -30 dBm to -20 dBm in the normal scale.

13.  Calibration. Equipment shall have an internal calibration circuit. It shall provide its own calibration signals.

a.        Level source. A precision level source shall be provided at each discrete measurement frequency available from the instrument.

b.    Control. The equipment shall provide a front panel pushbutton and level control that

shall make all the necessary connections for calibration. No external cabling shall be allowed.

14.  Probe power. The equipment shall provide a front panel output of 15 vDC , 50 mA maximum for a high impedance probe.

c.        Electrical and functional requirements.  This section shall reflect the minimum characteristics and accuracies which shall be acceptable for the spectrum display.

1.        Compatibility. The equipment shall be compatible with the frequency selective levelmeter described in para 2.2.

2.    Frequency.

a.    Range. The equipment shall be capable of displaying frequencies with 1 KHz to 25

MHz.

b.        Sweep width. The equipment shall provide three sweep width capable of the following:

*Continuous or recurring sweep.

*Single Sweep. Single sweep shall be activated by a pushbutton on the front panel.

* Manual Sweep. Manual sweep shall be provided by means of a tuning control. c.    Sweep width calibration. Sweep width calibration shall be provided by the

equipment using a nominal 4 KHz per channel, in channels and in KHz/division, for

six horizontal sweep scales as follows:

The sixth sweep mode shall sweep the entire frequency range of the instrument. The above scales represent deflection from the furthest left to right graticules of the cathode ray tube.

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