2Performance Tests
50 E4416A/E4417A Power Meters Service Guide
Output Standing Wave Ratio (SWR) Test
Specification
Description
This test measures the standing wave ratio (SWR) of the 50 MHz 1 mW output
(power ref) connector on the power meter to verify that it is within its
published specification.
When RF power is transferred from a source to a load, the level of power
absorbed by the load, PA, is dependent on the respective impedance of the
load and the effective output impedance of the source. This can be expressed
in terms of the voltage reflection coefficients (VRC) as follows:
Equation 2-5: Power Absorbed By The Load
Where:
• P
ZO
is the power that the source will deliver to a matched load.
• and are the VRCs of the source and load respectively.
Electrical Characteristics Performance Limits (maximum)
Output SWR 1.06
*
1.08
†
* For instruments with the 50 MHz 1mW output (power ref) connector mounted on the front panel.
† For instruments with the 50 MHz 1mW output (power ref) connector mounted on the rear panel.
This applies to models E4416A and E4417A with Option 003 fitted.
P
A
P
ZO
1 Γ
L
2
–
1 Γ
S
Γ
L
–
2
-----------------------------
×=
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