528 Keysight Technologies N9040B UXA Signal Analyzer 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)
Frequency: 10 MHz to 18 GHz
VSWR: < 1.1:1
1250-1745
Adapter
3.5 mm (f) to 3.5 mm (f)
Frequency: 10 MHz to 26.5 GHz
VSWR: < 1.1:1
83059B
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: 10 MHz to 26.5 GHz
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 PSG
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