IF Flatness Performance Test

(M9391A)

Although named IF Flatness, this test actually measures RF/IF frequency response. IF flatness is one component of the amplitude accuracy specification. In this test, a 1.2 GHz, –10 dBm signal is applied to the signal analyzer. A reference amplitude is taken with the input signal centered at the signal analyzer center frequency. The signal analyzer center frequency is then changed to set the input signal at various offsets within the FFT span of interest. At each offset frequency the amplitude is measured by the signal analyzer. The amplitude difference between the offset frequency and the reference frequency is reported as the IF flatness.

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Required Test Equipment

Test Equipment1

Recommended Models2

Signal generator

M9381A Opt 1EA

Fixed attenuator, 10 dB

8793C Opt 010

Frequency reference module

M9300A
  1. Refer to the main required equipment list for a list of available adapters and cables determined by the source ETE configuration.
  2. Refer to the main required equipment list for alternative models.

Connections and Setup Procedures

The illustrations below show the recommended M9381A PXIe signal generator. If your setup is using the alternative M9380A PXIe signal generator, refer to the M9380A Startup Guide for the default cable interconnections.

IF Flatness using a PXIe signal generator as the source

IF Flatness using a PSG-D signal generator as the source