IF Frequency Response Test

(N9912A Option 230/231)

This test measures the response flatness across a 5 MHz span in each band using special manipulation of the LO. For one frequency in each band, the external source generator is held at a single CW frequency while the LO steps through 101 points to cover the 5 MHz span. The LO stepping is accomplished via special service firmware. Amplitude is measured at each LO step. Each amplitude is referenced to the center point to determine flatness across the span.

Test type:

functional

Related specification:

There is no specification or typical that directly drives this test. This test confirms that IF flatness is acceptable. It confirms that the IF Frequency Response adjustment was performed successfully.

Related adjustment:

IF Offset and IF Frequency Response

Required Test Equipment

Test Equipment

Recommended Model Number
(see main equipment list for alternative models)

Signal Generator #1

E8257D with options:

  • 550
  • 1E1
  • 1EA or 1EU

  • UNR or UNX or UNY

Attenuator/Switch Driver

11713B Opt 001/024/060/101

Attenuator, 6 dB fixed

8491A Opt 006

Attenuator, 1 dB step

8494G Opt 001/024

Attenuator, 10 dB step

8496G Opt 001/024

Power Meter

N1914A

Power Sensor

E9304A Opt. H18

Power Splitter

11667A

Power Sensor Cable

11730A

BNC Cable

8120-2582

Type-N Cable

11500C

Attenuator control cable
(Qty. 2)

8120-2703

 

Connection Setups

The following notes apply to illustrations in the FieldFox Help:

  • Only a single representative model will be shown.
  • Some illustrations may differ than those in TME.

  • For procedures that apply to multiple ports, illustrations will show the setup on only one test port.

IF Frequency Response Test Setup