HP 4395A - Page 99

18. SECOND HARMONIC DISTORTION TEST (SA)
Description
This test measures the second harmonics level generated within the HP 4395A at a frequency
of 50.1 MHz in the HP 4395A spectrum analyzer mode.
This test applies a 50.1 MHz CW frequency signal to the HP 4395A R input through a 50 MHz
low pass lter (LPF). The LPF removes the second harmonics included in the applied signal.
This ensures that the harmonics read by the HP 4395A are internally generated and not coming
from the external signal source.
Specication
Second harmonic distortion
@input signal freq.  100 kHz
1
::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::: < 0 70 dBc
1: single tone input with full scale input 0 10 dB
Test Equipment
Signal Generator :::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: :
HP 8642B
Power Meter ::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: ::
HP 436A Opt. 022, HP 437B, or HP 438A
Power Sensor ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: ::
HP 8482A
50 MHz Low Pass Filter :::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::
PN 0955-0306
Two-Way Power Splitter :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::
HP 11667A
BNC cable, 61 cm (two required) :::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::
PN 8120-1839
BNC cable, 122 cm ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :
PN 8120-1839
BNC(f)-BNC(f) adapter ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: ::
PN 1250-0080
N(m)-N(m) adapter ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :
PN 1250-1475
N(m)-BNC(f) adapter (two required) :::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: ::
PN 1250-0780
Procedure
1. Initialize the signal generator. Then set the signal generator controls as follows:
Controls Settings
Frequency 50.1 MHz
Amplitude 0 14 dBm
2. Connect the test equipment as shown in Figure 2-27.
Note
Connect the signal generator's 10 MHz frequency reference output to the
HP 4395A EXT REF Input on the rear panel as shown in Figure 2-27 . With this
conguration, both the signal generator and the HP 4395A are phase locked to
the same reference frequency to obtain a stable measurement.
Performance Tests 2-67