Dynamic Accuracy Test - Agilent Technologies N5242A Service Manual

Tests and Adjustments
Performance Tests

Dynamic Accuracy Test

Function of the Test: To measure the relative power linearity of the analyzer's receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used: The dynamic accuracy test set (Z5623A Option H01), a power meter
(E4418B or E4419B Option G12 or Option H12), power sensors, and two test cables.
Description of the Test:
1. The analyzer's test ports are tested separately at a specific CW frequency and a
reference power level of −20 dBm.
2. The analyzer's driving port is connected to the dynamic accuracy test set's source port
and the analyzer's receiving port is connected to the dynamic accuracy test set's
receiver port. A power sensor is connected to the dynamic accuracy test set's power
meter port.
3. The dynamic accuracy test set is used to input a signal from the driving port on the
analyzer. The input signal is routed through step attenuators to both the analyzer and
a power sensor.
4. The analyzer source and the dynamic accuracy test set create power levels that are
"deltas" from the reference power level of −20 dBm. Each delta is measured two ways:
by the power sensor and by the analyzer's receiver under test.
5. The analyzer's power level into the port under test is set to the −20 dBm reference
level.
6. The power level is measured with the power sensor: (P
7. The power level is measured using the analyzer's receiver under test: (P
8. The power level into the analyzer's port under test is stepped, in 5 dB steps, over the
range of 0 to −120 dBm. Each power level represents a "delta" from the reference power
level.
9. At each step, the power level is measured using the power meter: (P
10. At each step, the power level is measured using the receiver under test: (P
11. The power error in dB = (P
If the Analyzer Fails this Test:
• If the analyzer fails this test, replace the A23 mixer brick for a Port 1 or Port 2 failure or
the A24 mixer brick for a Port 3 or Port 4 failure, then repeat this test. Refer to
"Removing and Replacing the A23 and A24 Mixer Bricks" on page
• If the analyzer still fails this test, replace the A12 SPAM board and repeat this test.
Refer to "Removing and Replacing the A4–A13 Boards" on page
3-34
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