Isolated differential probes have several benefits over standard differential probes, especially when measuring floating test points in the presence of high common-mode voltages.
Galvanically isolated voltage probes separate the device under test (DUT) from the oscilloscope and earth ground, enabling safer and more accurate measurements. This isolation effectively rejects common-mode signals, minimizes noise interference, and eliminates ground loops in high-voltage environments. A high common-mode rejection ratio (CMRR) is essential for capturing small signals accurately, even in the presence of large common-mode voltages at floating nodes. The CMRR of an isolated probe can be over 100 million times greater than that of a standard differential voltage probe referenced to earth ground.
To ensure safe operation, read the user's guide before using the probe.
- Learn About Probe Types
- Learn About the Probe-to-Oscilloscope Interfaces
- Newsletter on Keysight's Optically Isolated Differential Probes
Probes
| Model | Type | Interface | Bandwidth (-3 dB) | Input Z Diff |
|---|---|---|---|---|
| PS0004A/6A/8A | Optically Isolated Differential | AutoProbe 1 |
350 MHz (PS0004A) 700 MHz (PS0006A) 1.00 GHz (PS0008A) |
50 Ω |