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Differential Oscilloscope Current Probe 2.0

Measure Currents Using Your Oscilloscope

Differential Oscilloscope Current Probe 2.0
Differential Oscilloscope Current Probe 2.0
Measuring the dynamic behaviour of a circuit without a differential current probe is very challenging. To tackle such challenges we present an updated differential current probe design for oscilloscopes that has a single-ended output and wide bandwidth. Its standard gain of two can be increased by changing just a single resistor.
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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Component list

Component list

Resistors:

(all 1%, 100 mW, SMD 0603)

R1,R2 = 1 k

R3,R4 = 10 M

R5 = 10 k

R6 = 50 Ω

R7,R8 = 22 k

 

Capacitors:

C1,C2 = 33 p / 50 V, 1%, C0G/NP0, SMD 0603

C3,C5,C8,C10 = 100 n / 50 V, 10%, X7R, SMD 0603

C4,C6,C7,C9 = 10 µ / 25 V, 20%, X5R, SMD 0603

C11,C12 = 10 µ / 35 V, 10%, X5R, SMD 0805

C13,C14 = 100 n / 100 V, 10%, X7R, SMD 0805

 

Inductor:

L1 = 100 µH at 100 kHz, common-mode choke, 200 mA, SMD, e.g. SRF4532-101Y, Bourns

 

Semiconductors:

IC1 = AD8421ARMZ, MSOP8

IC2 = L78L15ACUTR, SOT89

IC3 = L79L15ACUTR, SOT89

LED1,LED2 = LED, red, SMD 0603

D1–D4 = MBR0540T3G, SOD123

 

Miscellaneous:

K1 = 3-way SIL socket, vertical mount, 0.1 inch pitch

3-way SIL socket as plug for test leads*

Type RG316 coaxial cable, 50 Ω, 2.9 mm diameter, 1 m, e.g. Conrad 606450*

BNC crimp plug for RG316, 50 Ω, e.g. Conrad 1490723*

USB1KL enclosure, 56x20x12 mm, e.g. Conrad 531276*

Alternative enclosure: TC-USB1 KL203, 56x20x12 mm

Printed circuit board 180665-1 v1.0*

 

* see text

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