HP 4395A - Page 93

17. AMPLITUDE ACCURACY/FREQUENCY RESPONSE TEST
(SA)
Description
This test measures the amplitude measurement accuracy of the HP 4395A spectrum
measurement over the entire frequency range. The frequency response is calculated as the
accuracy deviation from the absolute amplitude accuracy at a frequency of 50 MHz.
At frequency ranges  1 MHz, this test applies a CW signal to the HP 4395A input and
power meter through a power splitter. The signal level is measured by doing a HP 4395A
spectrum measurement using a power meter and a power sensor. Then the HP 4395A reading
is compared with the reading of the power meter to obtain the absolute amplitude accuracy.
These tests are performed twice while reversing connections of the power splitter's two output
ports. This is done to remove the frequency tracking between two output ports of the power
splitter.
At low frequencies ( < 1 MHz), this test measures the CW signal level of the function generator
using the HP 4395A spectrum measurement. The function generator's output level is used as
the measurement standard.
Specication
Amplitude accuracy
@ 0 20 dBm input, 50 MHz, input att.= 10 dB
,23 6 5

C ::::: :::: ::::: :::: :::: ::::: ::<
6 0.8 dB
Frequency response
@ 0 20 dBm input, input att.= 10dB, referenced to level at 50 MHz, 23 6 5

C
frequency  100 Hz ::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: : <
6 1.3 dB
frequency < 100 Hz ::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: : <
6 3.0 dB
Test Equipment
Power Meter ::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: ::
HP 436A Opt. 022, HP 437B, or HP 438A
Power Sensor ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: ::
HP 8482A
Signal Generator ::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: :::::
HP 8663A
Function Genarator ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::: HP 3325A/B
Two-Way Power Splitter :::: ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: ::: HP 11667A
Type-N Cable,61 cm ::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: ::: HP 11500B or part of HP 11851B
BNC cable,61 cm ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: ::: PN 8120-1839
BNC cable, 122 cm ::::: :::: ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: : PN 8120-1840
N(m)-N(m) adapter ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::: :
PN 1250-1475
N(m)-BNC(f) adapter ::::: :::: ::::: :::: ::::: :::: :::: ::::: :::: ::::: :::: ::::: :::: ::::
PN 1250-0780
Procedure
1. For testing high frequencies
a. Connect the power sensor to the power meter. Calibrate the power meter for the power
sensor.
b. Connect the test equipment as shown in Figure 2-24.
Performance Tests 2-61