Keysight N9038A, Service Manual, Page: 683 / 745

702 Keysight N9038A MXE Service Guide
Tests
Scale Fidelity
Scale Fidelity
Test Limits
The scale fidelity error test limit is
±
1.0 dB.
Overview
This test checks the scale fidelity of the receiver 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 receiver’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.
This measurement is performed on RF Input 1 only.
Table 22-22 Scale Fidelity - Required Equipment
Item
Critical Specifications
(for this test)
Recommended
Keysight Model
Adapter
a
Type-N (m) to 3.5 mm (f)
Frequency: 50 MHz
VSWR: < 1.1:1 1250-1744
Adapter
b
3.5 mm (f) to 3.5 mm (f)
Frequency: 50 MHz
VSWR: < 1.1:1 83059B
Adapter
c
2.4 mm (f) to 3.5 mm (f)
Frequency: 50 MHz
VSWR: < 1.1:1 11901B
Attenuator, 10 dB
d
3.5 mm (m) to 3.5 mm (f)
Frequency: 50 MHz
VSWR: < 1.2:1 8493C,
Option 010
Attenuator, 10 dB Step
3.5 mm (f) to 3.5 mm (f)
Range: 0-50 dB
Frequency: 50 MHz
Accuracy:
±
0.25 dB
8495A
Option 004
Cable, 1 meter
d
3.5 mm (m) to 3.5 mm (m)
Frequency: 50 MHz
VSWR: < 1.4:1 11500E
Cable, 120 cm
BNC (m) to BNC (m)
Frequency: 10 MHz 10503A
Signal Generator Frequency: 50 MHz
Output Level Accuracy: 0 to –15 dBm: ± 1.0 dB
PSG
a. Required for Option CNF (Type-N RF Input 1)
b. Quantity of 2 required for Option C35 (3.5 mm RF Input 1)
c. Required for Option 544 (44 GHz Frequency Range)
d. Quantity of 2 required