Intro
I bought an old an HP 6294A DC power supply from the Dayton Ham fest back in 2013. The guy I bought it from promised that it worked fine, and I took it home for pretty cheap. The supply did work, but the dual voltage/current meter on the front didn't. It was surprisingly hard to find a replacement meter, and it was going to be very expensive. Instead, I continued to use the supply (with an attached multimeter). I recently came across a
cheap digital display, and I decided to swap it in.
The meter
The
meter. DROK 100V, 10A, internal shunt. ~$12 from amazon. Probably could have found it cheaper elsewhere.
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| DROK meter |
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| DROK meter with wire colors explained. The two small wires (black and red) power the meter. The meter power can be any DC supply from 4.5 to 30V. The three larger wires (red, yellow, black) are the inputs for the meter. |
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| DROK wiring schematic. The red wire is the voltage sense and attaches the high voltage side of the load. The yellow wire is the negative side of the load. The black wire connects to the HP Power supply common. |
The Supply
As it turns out, the HP 6294A DC power supply is a purely analog DC power supply. This means that there are NO convenient 5V, 12V, etc. rails to tap into for the meter. Therefore, I had to use a wall wart (see below) to power the meter.
Safety
Before I did ANYTHING, I unplugged the supply from the wall and gave the capacitors (there was one really big one) time to discharge.
The Install
Awesome! Great post, very clear and thorough. I would love to try fluke true rms clamp meter 323. Thank you! Keep it up!
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