Some users in high-voltage test environments seek measuring instruments with isolated inputs because they want the safety and convenience of isolation without having to spend money on an isolated oscilloscope probe, like the Teledyne LeCroy DL-ISO or the Tektronix IsoVu®. While that's understandable, isolated inputs built into the instrument channel may be convenient, but they don't necessarily give you good performance, certainly not as good as you would get from a high quality, high-voltage isolated probe.
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| Figure 1. Cascaded H-bridge signals captured using an isolated input (left) and an isolated probe (right). |
