HP 4395A - Page 82

14. AMPLITUDE FIDELITY TEST (SA)
Description
This test checks the HP 4395A amplitude delity at RBW of 10 kHz. A 50.1 MHz CW signal is
applied to the HP 4395A R input through a step attenuator. The signal amplitude is varied by
inserting known attenuation values. Each signal amplitude [dB] is measured to a reference
value at the attenuator setting of 10 dB. Then the measured values are compared with to the
inserted attenuation's calibrated values.
The amplitude delity performance at RBWs  3 kHz are not tested in this test. The error
sources at RBW  3 kHz are exactly same as those of the magnitude ratio dynamic accuracy
in the HP 4395A network analyzer mode. Because the dynamic accuracy is tested in the
Magnitude Ratio/Phase Dynamic Accuracy Test , the delity test at the RBW  3 kHz is
omitted.
The amplitude delity performance at low signal levels are not tested in this test. That is, the
delity is not checked at signal levels 0 60 dB (from the reference level) at an RBW of 10 kHz
and at signal levels 0 50 dB (from the reference level) at an RBW of 1 MHz. These tests are
not necessary because the delity performance at these levels are theoretically determined by
the delity at higher signal levels and the delity at an RBW of
 3 kHz.
6 and 10 dB xed attenuators with a VSWR of
 1.015 are connected to the signal generator
output connector and the HP 4395A S input, respectively
. These xed attenuators are used to
reduce the measurement uncertainties caused by mismatch error. When they are used, the
measurement uncertainties listed in the performance test record are valid.
Specication
Amplitude delity
Log scale
Range
(relative to full scale input level)
Amplitude Fidelity
1
0dB  range > 0 30 dB 6 0.05 dB
0 30 dB > range 0 40 dB 6 0.07 dB
0 40 dB > range 0 50 dB 6 0.15 dB
0 50 dB > range 0 60 dB 6 0.35 dB
0 60 dB > range 0 70 dB 6 0.8 dB
0 70 dB > range 0 80 dB 6 1.8 dB
1 @23 6 5

C, RBW = 10 Hz, 0 20 dBm  ref. value  +30 dBm, ref. input level =
full scale input level 0 10 dB
Test Equipment
Signal Generator ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::
HP 8663A
Step Attenuator
1
, 10 dB step, VSWR  1.02 ::::: :::: ::::: :::: ::::
HP 8496G Opt. 001 and H60
Attenuator Driver ::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: :::
HP 11713A
Type-N Cable, 61 cm (two required) :::: :::: ::::: :::: ::::: ::::
HP 11500B or part of HP 11851B
BNC cable, 122 cm :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: :: PN 8120-1840
6 dB Fixed Attenuation, VSWR  1.015 ::: ::::: :::: ::::: :::: :: HP 8491A Opt. 006 & Opt. H60
10 dB Fixed Attenuation, VSWR  1.015 :::: :::: ::::: :::: :::::
HP 8491A Opt. 010 & Opt. H60
1: Calibration values for attenuation settings of 10 dB to 60 dB at 50 MHz are required.
2-50 Performance Tests