HP 84811A Operating And Service Manual page 8

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ህ 008 AS
RETURN LOSS PERFORMANCE TEST (cont'd)
non-radiating open if operating below 10 GHz. Readjust the source so that the reading
on power meter #1 is equal to the incident wave reference level measured in step #3.
Measure and record the power level using power meter 52, at the reflected port.
Power Meter #2 (reflected port)
Power Meter #2 (reflected port)
Return loss reference
8, Read and record the power level indicated on power meter #2.
Power Meter #2
9. Determine and record the maximum error of the test system using the following
data:
Test Frequency
ዢነ የ e mrs vemm de ey ice n ciu. rw
100 MHz to 8 GHz
8 GHz to 12 GHz 2.1 dB
12GHzto18GHz | 14dB
ETOT 085
10. Compute the return loss for D.U.T. using the following formula.
(Power Meter #2 reading — step 8)
— (Return Loss Reference — step 6)
ተ (Maximum Error of test system — Step 9)
Return Loss of D.U.T.
For frequencies between 100 MHz and 12 GHz return loss for D.U.T. mustbe 14 dB (or
« 1.5 SWR).
For frequencies between 12 GHz and 18 GHz the return loss for D.U.T. must be > 9.55 dB
(or < 2.0 SWR).