II. Linearity Test

D

1.Make sure that the HP 8156A output is disabled. ZERO the DUT.

2.Enable the HP 8156A output.

3.On the DUT, switch o￿ autoranging and select the -20dBm range. Set the display to show results in dBm.

4.Alter the attenuation until the DUT displays -17.4dBm.

5.Press 4Disp!Ref5, then 4dB5.

6.Press 4Up5 to select the -10dBm range.

7.Note the deviation, displayed in dB, as R1 on the test record.

a.In the -10dBm range. Set the display to show results in dBm.

b.Alter the attenuation until the DUT displays -7.4dBm.

c.Press 4Disp!Ref5, then 4dB5.

d.Select the 0dBm range.

e.Note the deviation, displayed in dB, as R2 on the test record.

8.Repeat the steps a to e at all the range and level settings shown in the test record.

9.Calculate the non-linearity using the formulae in the test record.

Performance Tests D-5