Hi to All,
Some time ago I acquired a few Tektronix TCA Differential Probes. They all pass the Standard Tests, but the only two P7380 Probes show intriging noise results.
One of them has a little DC-Offset with open inputs, The other not. When shorted to ground both Probes have no DC-Offset. On both I observed with 5x Attenuation and highest TDS7404B Sensitivity (thus 10 mV/Div on Scope) a little drifting Noise-Baseline (Burst/Pop-Corn Noise?) in comparison with the other Differential Probes (P7330 and P7380SMA). Is that normal for P7380 Probes? Even more strange on one of the P7380 Probes (with signs of repair!) there is no difference between Noise Measurement Values (Vpp and RMS) with open or shorted inputs. Anybody with some clues on this?
Calibrationfixture