HP 8559A ...................................... HP 181T/TR

MODEL 8559A PERFORMANCETESTS

PERFORMANCE TESTS

4-17. AVERAGE NOISE LEVEL

SPECIFICATION:

The maximum average noise level for each frequency band, with 1 kHz resolution bandwidth and 0 dB attenua- tion, is given in Table 4-5.

DESCRIPTION:

The average noise level of the spectrum analyzer is checked by observing the average noise power level displayed on the CRT when no input signal is applied to the instrument.

-111 dBm LIMIT

AVERAGE NOISE

POWER LEVEL

FIGURE 4-13,AVERAGE NOISELEVELMEASUREMENT,.01- 3 GHz

EQUIPMENT:

Variable Persistence/Storage Display	...................................... HP 181T/TR
5OQ Termination .................................................	HP 909A, Opt. 012

NOTE

The HP 853A Spectrum Analyzer Display may be substituted for the HP 181T/TRin this procedure.

NOTE

This test can be performed with no input termination if INPUT ATTEN is set to 20 dB. Note that the input attenuation must then be taken into consideration in establishing the equivalent REFERENCE LEVEL control setting for the measurement. A REFERENCE LEVEL setting of -40 dBm with 20 dB INPUT ATTEN is equivalent to a REFERENCE LEVEL setting of - 60 dBm with 0 dB INPUT ATTEN.