VA Tester

Updated: All, VA Tester Leave a Comment

Current Version: 2.01

Purchase: Tindie, Hackaday, FriedCircuits


  1. Output Screw Terminal
  2. Input Screw Terminal
  3. Current Test Points
  4. Voltage Test Points (When measuring only voltage make sure to set the 2pin jumper on the current test points)
  5. Backpack connection
  6. Backpack connection

The VA Tester is like the USB Tester except with screw terminals and you can measure up to 26VDC. The OLED Backpack fits on top and you can view the data as well as log it on the Java app.


1.0: Initial

1.1:  Fixed position of screw terminals, silkscreen cleanup, split apart voltage header

1.2: Swapped banana connections for test points.

2.0: Updated to match USB Tester layout with both types of test points


Steps for assembly can be found here: VA Tester Assembly
Using the VA Tester is very similar to the USB Tester. The right side of the VA Tester is the input and the left side is the output. Using the screw terminals you can attach wires or even jumper wires that are terminated. From the front the top contacts are positive and the bottom are negative. There isn’t protection on the tester so make sure you don’t reverse the wires.
To measure voltage place the jumper on the header above the middle white line. Then you can probe the test points on the lower half or connect clips to the headers in the middle below the white line. The right one is VCC and the left one is GND.
First remove the jumper from the header above the white line. Connect your DMM positive probe to the right test point or clip to the right pin of the header. Then do the same for the negative probe to the left test point or left pin of header.
If you have the backpack you attach it after your connections are made. Make sure you remove the jumper as this will bypass the backpack.

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