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Checking the attenuator

First connect the high and low connectors using one of the supplied SMA cables

Switch on the tinySA and enable the CAL output at 30MHz using the commands MODE/Cal Output/30MHz

Return to low input

Activate the linearity test with MEASURE/MORE/LINEAR and this will step the built-in attenuator through all attenuation values and draw a green line on the screen at the measured signal level. If all goes well the line should be flat within +/- 1dB with an occasional measurement deviating due to interference/noise

If you observe deviations in the green line of more than +/- 1dB (excluding some noise/interference) post a readable picture or screen capture of the screen of the completed linearity test on the tinySA support group

The test also helps in getting confidence about the 1dB compression point of the tinySA. This can be measured by applying a signal of 0dBm and activating the MEASURE/MORE/LINEAR test The compression starts when attenuation is below 2dB and is just visible in the green line being curved down a bit at the right side because of the compression.