Frequency Response Above 3 GHz Performance Test

Frequency Response (or flatness) is defined as the amplitude deviation from the reference value at 50 MHz. The complete E444xA Frequency Response is measured with three different tests:

Frequency Response Below 300 kHz
Frequency Response 300 kHz to 3 GHz
Frequency Response Above 3 GHz (this test)

The Frequency Response Below 300 kHz test is used to verify flatness from 10 Hz to 300 kHz. The 300 kHz normalized error from the Frequency Response 300 kHz to 3 GHz test is used as the reference point for the Frequency Response Below 300 kHz test. The Frequency Response Above 3 GHz test verifies flatness from 3.0 GHz up to 50 GHz, depending on your instrument frequency range.

This test verifies the displayed amplitude vs. frequency over the frequency range from 3.0 GHz to 50 GHz. For each test frequency, the amplitude error is normalized to 50 MHz, and the result is called Frequency Response.

The E444xA flatness corrections are located every 100 MHz for frequencies above 3 GHz.

Above 3 GHz, the flatness specification widens out such that higher uncertainties can be tolerated; therefore a splitter calibration is not necessary.

Click here for troubleshooting.

Required Test Equipment

Test Equipment	Model Number	E4440A E4443A E4445A	E4446A E4447A E4448A
Synthesized Sweeper	PSG Models (see equipment list)	X	X
Power Meter	N1914B	X	X
Power Sensor	N8485A	X
Power Sensor	N8487A		X
Power Splitter	11667B	X
Power Splitter	11667C		X
3.5 mm Cable	8120-4921	X
BNC Cable	8120-2582	X	X
2.4 mm Cable	8120-6164		X
2.4 mm (f) to 3.5 mm (f) adapter	11901B	X
Type-N (m) to 3.5 mm (m) adapter	1250-1743	X
3.5 mm (f) to 3.5 mm (f) adapter	83059B	X
Type-N (m) to 2.4 mm (f) adapter	11903D		X
3.5 mm (f) to Type-N (m) (8485A adapter)	08485-60005	X
2.4 mm (f) to Type-N (m) (8487A adapter)	08487-60001		X

Frequency Response Above 3 GHz Performance Test

Required Test Equipment

Connection Setup

Power Meter Calibration (Channel A)

Frequency Response Above 3 GHz Test Setup