Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Product List
The Best Way

One of the best measurement techniques, which is also inexpensive, is to simply use a 50 Ω coax cable. To keep the measurement loop as tight as possible between VOUT and ground, the engineer recommends RG174 or RG316 type cable with 50 Ω impedance termination. The coax cable should be soldered directly across the capacitor of interest on the PCB. Compared to the 10X probe with wrapped ground technique, using 50 Ω coax cable reduces the measured ripple from 35 mV peak-to-peak to an accurate 10 mV peak-to-peak. This technique is more time consuming than the previous techniques since it requires soldering of the coax across the capacitor of interest, but it results in very accurate and repeatable measurements.

PTM Published on: 2020-10-01