Agilent Technologies HP 8642A/B Dokumentacja Pobierz pdf (Strona 248)

100

101

Parameter Entry Descriptions

Known Osc.

The 3 Oscillator Comparison function must be used to determine the

noise level of the reference device (Known Osc). Once a known reference

level is established, the HP 3048A subtracts the reference noise from the

measurement results. The 2 Oscillator Comparison function is only valid if

the Measurement Definition parameters and the segment table parameters

are kept the same for the reference device vs. the DUT, as when

the reference device was measured using the 3 Oscillator Comparison

function.

Description

Measurement Uncertainty

The noise level of the two devices should be within 3 to 6 dB of each other

at the frequency offset of interest. The amount of uncertainty increases

when the phase noise differs by more than 3 dB. Also, a minimum of

20 averages defined in the Type/Range display is recommended when

measuring the devices.

How to Make a 2 Oscillator Comparison

NOTE

This procedure assumes that the 3 Oscillator Comparison

function has been used to establish the noise level of the

reference device (Known Osc).

Measure the known reference device against the DUT and Store the

results at the same mass storage location as the Result File for the

reference device. (Refer to Result

Files

in Chapter 3, Graphic Functions

if you need information about storing files.)

4-24 2 Osc. Compar.

1 2 ... 243 244 245 246 247 248 249 250 251 252 253 ... 452 453

Komentarze do niniejszej Instrukcji

Brak uwag

Agilent Technologies HP 8642A/B Dokumentacja Strona 248

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Pomiary, testowanie i kontrola Agilent Technologies HP 8642A/B