Performance Tests
Performance Test 3
3-49
Attenuation Accuracy – 75
Ω
Leveling Head (Optional, 96040A and 96270A)
Equipment required for this test:
• Measuring Receiver
• Precision Adapter, Type-N female-to-female, 75 Ω
• Attenuator, 6 dB, 50 Ω, N-Type
• 75 Ω to 50 Ω impedance-matching pad
• 75 Ω Leveling Head (supplied with UUT)
Note
In the subsequent tests, the tolerances shown refer to specifications
listed in Chapter 1, Specifications of this manual. In some cases the
test limits must be altered due to the uncertainty of the actual
equipment used. For example, if the Instrument specification is
±0.025 dB and the Measuring Receiver uncertainty is ±(0.015 dB +
0.005 dB per 10 dB step) the test limit for 18 dB would be
±0.035 dB
(the root-sum-square of 0.025 and 0.024).
To verify the attenuation accuracy of the UUT output relative to +16 dBm, 75
Ω:
1. Connect the 75
Ω Leveling Head to the RF INPUT of the Measuring Receiver
via a 75
Ω to 50 Ω impedance-matching pad and 6 dB attenuator. Connect
the REF FREQUENCY OUTPUT (rear panel) from the UUT to the Spectrum
Analyzer Ext Ref In (on rear). See Figure 3-13 for equipment connections.
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