• on Test & Measurement
  • Published in issue 9/2014 on page 46
About the article

Isolated Oscilloscope Probe

Petite and practical

Isolated Oscilloscope Probe
However much you might wish for an oscilloscope with electrically isolated inputs, it’s hard to justify the cost for personal projects. Even differential probes, which (within certain limits) enable voltages to be measured without reference to ground, often cost the private user more than a complete scope does. So what can you do when either safety considerations or the nature of the task in hand require the use of isolated connections to your oscilloscope?
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Component List
Resistors
(SMD 1206)
R1 = 10?
R2 = 9M?
R3 = 1M?
R4 = 100 k?
R5,R6 = 1k?

Capacitors
C1–C4 = 100nF (SMD 1206)

Inductors
L1 = 10µH (SMD 1206)

Semiconductors
U1 = AduM5242 (SOIC-8)
U2 = AMC1200 (SOP-8)
U3 = OPA333AIDBV (SOT-23)

Miscellaneous
CON1 = BNC plug, panel mount
CON2,CON5 = 3-pin pinheader, 0.1” pitch
CON3 = mini-USB receptacle
CON4 = 2-pin pinheader, 0.1” pitch
CON6 = BNC socket, panel mount
PCB # 130297-1
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