Micsig DP700 CMRR measurement using the Bode 100 and the B-AMP12 amplifier.

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I recently purchased the Micsig high-voltage differential probe and wanted to measure its Common Mode Rejection Ratio (CMRR) to evaluate its performance. Dave Jones made similar CMRR measurent but did not have the B-AMP12 amplifier which outputs a large signal. The measurement is more accuate than what Dave Jones made.

CMRR is an important specification for differential probes, as it indicates how well the probe rejects common-mode signals while measuring differential signals. To perform this measurement, I used the Bode 100 network analyzer, which is ideal for assessing the frequency response of devices like differential probes.

In this guide, I’ll walk you through the steps of setting up the Bode 100 to measure the CMRR of the Micsig probe. I’ll also show how to measure the CMRR of a Pico Technology probe under similar conditions, allowing for a direct comparison between the two probes.