Source Power Linearity Test - Agilent Technologies E8362A Service Manual

PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A

Source Power Linearity Test

Function of the Test: To verify that the power level is linear over the analyzer's
frequency range and to check the linearity of the automatic leveling control (ALC).
Specification Tested: Power Sweep Range and Power Level Linearity
Equipment Used: A test cable. (And a 20 dB pad if the analyzer does not have an internal
step attenuator.)
Description of the Test:
1. The Port 2 receiver is used to test Port 1. The receiver linearity is the standard against
which the source linearity is checked.
2. A test cable is connected between Port 1 and Port 2 with 20 dB of attenuation in series
with the cable. This can be done with an internal step attenuator or an external 20 dB
pad. This attenuation ensures that the receiver remains in its linear range.
3. The analyzer is set to 25 different points across its frequency range.
4. At each frequency point, the output power level on Port 2 is set to 0.000 dBm and the
power is measured to establish a reference, P
5. The source setting is then stepped from −15 to +10 dBm in 1 dB steps and the power is
measured, P
measured
6. The non-linearity in dB at each frequency point is calculated as:
− P
(P
measured reference
If the Analyzer Fails this Test:
• Perform the "Source Calibration Adjustment" on page 3-43
• If the analyzer still fails this test, replace the source assembly and repeat this test.
Refer to "Removing and Replacing the A12 Source 20" on page
Frequency Accuracy Test
Function of the Test: To verify the frequency accuracy and range of the analyzer's source
output.
Specification Tested: Test Port Output–CW Accuracy
Equipment Used: A frequency counter, a test cable, and adapters.
Description of the Test:
1. Port 1 is connected to a frequency counter.
2. A series of frequencies across the band are checked.
If the Analyzer Fails this Test:
• Verify the accuracy of the 10 MHz OCXO by connecting a frequency counter to the
rear-panel 10 MHz REF OUT.
• If the 10 MHz reference is off by more than 10 Hz, perform the
Reference Adjustment" on page 3-49
Adjustment" on page 3-50
Service Guide E8364-90001
, at each setting.
) − (source setting)
and also the
and repeat this test.
Performance Tests (Agilent N2721A Software Package)
.
reference
and repeat this test.
7-22.
"10 MHz Frequency
"3.8 GHz PMYO Frequency
Tests and Adjustments
3- 31