514
Keysight NFA Series Noise Figure Analyzers Service Guide
Functional Tests
Scale Fidelity
Scale Fidelity
Test Limits
The scale fidelity error will be
≤
±1.0 dB with
≤
-10 dBm at the mixer.
This test checks the scale fidelity of the instrument by maintaining a constant
reference level and measuring signals of different amplitudes over most of the
display range. This test sets the input attenuator to 10 dB and the Reference
Level to 0 dBm. The external attenuator is set to 0 dB, and the amplitude of the
source is adjusted to set the displayed signal at the reference level.
The instrument’s internal marker is used to measure the reference amplitude.
The Marker Delta function is activated and the RF input is reduced using the
external precision step attenuator. Signal input levels from 0 dBm to -50 dBm
are measured.
Item
Critical Specifications
(for this test)
Recommended
Keysight Model
Adapter,
Type-N (m), to 3.5 mm (f)
a
Frequency: 50 MHz
VSWR: < 1.1:1
1250-1745
Adapter,
3.5 mm (f) to 3.5 mm (f)
Frequency: 50 MHz
VSWR: < 1.1:1
83059B
Adapter,
2.4 mm (f) to 3.5 mm (f)
(2 required)
b
Frequency: 50 MHz
VSWR: < 1.1:1
11901B
Attenuator, 10 dB Step
Range: 0-50 dB
Frequency: 50 MHz
Accuracy:
±
0.25 dB
8495A
Attenuator, 10 dB fixed (2 required)
Frequency: 50 MHz
VSWR: < 1.2:1
8493C, Option 010
Cable, 3.5 mm, 1 meter (2 required)
Frequency: 50 MHz
VSWR: < 1.4:1
11500E
Cable, BNC 120 cm
Frequency: 10 MHz
10503A
Synthesized Sweeper
Output Level Accuracy: 0 to –15 dBm:
±
1.0 dB at 50 MHz
PSG
a. For N8973B, 74B, 75B
b. For N8976B
Содержание N8973B
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Страница 44: ...44 Keysight NFA Series Noise Figure Analyzers Service Guide Overview How to Return Your Instrument for Service ...
Страница 132: ...132 Keysight NFA Series Noise Figure Analyzers Service Guide Instrument Messages Condition Messages ...
Страница 228: ...228 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting ...
Страница 268: ...268 Keysight NFA Series Noise Figure Analyzers Service Guide Analog Digital IF Troubleshooting 25 MHz BW IF Section ...
Страница 322: ...322 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams Block Diagrams ...
Страница 332: ...332 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams NFA Computer Block Diagram ...
Страница 350: ...350 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Front Panel Key Test ...
Страница 470: ...470 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Front Frame Assembly ...