Scale Fidelity - Keysight N9000A Service Manual

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
Adapter,
Type-N(m), to 3.5 mm(f)
Adapter,
3.5 mm(f) to 3.5 mm(f)
Attenuator, 10 dB Step
Attenuator, 10 dB fixed (2 required) Frequency: 50 MHz
Cable, 3.5 mm, 1 meter (2 required) Frequency: 10 MHz to 26.5 GHz
Cable, BNC 120 cm
Synthesized Sweeper
310
Critical Specifications
(for this test)
Frequency: 10 MHz to 18 GHz
VSWR: < 1.1:1
Frequency: 10 MHz to 26.5 GHz
VSWR: < 1.1:1
Range: 0-50 dB
Frequency: 50 MHz
Accuracy: ±0.25 dB
VSWR: < 1.2:1
VSWR: < 1.4:1
Frequency: 10 MHz
Output Level Accuracy: 0 to –15 dBm: ±1.0 dB
Recommended
Agilent Model
1250-1745
83059B
8495A
8493C, option 010
11500E
10503A
PSG
Chapter 15