Chapter 3 111
PSA Functional Tests
Frequency Response (Flatness)
PSA Functional Tests
Frequency Response (Flatness)
Test Limits
Test Description

The frequency response test measures the spectrum analyzer’s amplitude error as a

function of the tuned frequency. Measurements are made ranging from 50 MHz to the

maximum frequency range of your analyzer. The signal source amplitude is measured with

a power meter to eliminate error due to source flatness. The measured value is n ormalized

to 50 MHz.

Frequency Range Limit Relative to
50 MHz
3 Hz to 3 GHz ±1.5 dB
> 3 GHz to 6.6 GHz ±2.5 dB
> 6.6 GHz to 22 Ghz ±3.0 dB
> 22 GHz to 26.5 GHz ±3.5 dB
> 26.5 GHz ±3.5 dB
Item Critical Specifications
(for this test) Recommended
Agilent Model
Adapter Type N(m) to 3.5 mm(m) 1250-1743
Adapter Type N(m) to 3.5 mm(f) 1250-1744
Adapter a2.4 mm(f) to 3.5 mm(m) 11901D
Adapter 3.5 mm(f) to 3.5 mm(f) 5061-5311
Cable 3.5 mm, 1 meter 8120-4921
Cables BNC, 120 cm (48 in.) 10503A
Power Meter Compatible with power sensor E4418B
Power Se nsor Frequency Range: 50 MHz to 26.5 GHz 8485A
Power Se nsor aFrequency Range: 50 MHz to 50 GHz 8487D
Power Splitter Frequency Range: 50 MHz to 26.5 GHz
Tracking between ports: < 0.25 dB 11667B