Freq Resp 300 kHz to 3.6 GHz Preamp On Performance Test

This test applies to the following models with Preamplifier:

Frequency response (aka. Flatness) is defined as the amplitude deviation from the reference amplitude at 50 MHz. The complete analyzer frequency response is measured with several tests.

The model and options of the DUT will determine which tests are run from the list below.

A “buried power sensor” technique is used to characterize the tracking error of a power splitter in order to avoid the relatively large specified tracking error. This technique reduces the measurement uncertainty to verify the frequency-response specification for the 300 kHz to 3.6 GHz range. The buried sensor calibration is valid for four hours.

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Required Test Equipment

Test Equipment

Recommended Model Number

RF Signal Generator

PSG Models
(see equipment list)

Power Meter


RF Power Sensor
(2 required)


RF Power Splitter


20 dB Fixed Attenuator

8491A Option 020

Type-N Cable


Type-N (m) to Type-N (m) adapter


3.5 mm (f) to Type-N (f) adapter
(for 3.5 mm source)


2.4 mm (f) to Type-N (f) adapter
(for 2.4 mm source)


Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

Power Meter Calibration


Splitter Characterization



Freq Resp 300 kHz to 3.6 GHz Preamp On Test Setup