Products > Test Equipment
DC Load - I need some guidance
DaneLaw:
Shame with the whine, as it is such relative things that one would expect are sorted out the more expensive units from certain brands - Tonghui rebadge or not.
Where did you purchase it from? did it seem new when it arrived (like you were the first unboxing it) if not, it could indicate that its solely this unit, and some other buyer has been there with a "no thx, you're going back" and the reseller is trying their luck to find it a new home.
Are the 4mm protruding input jacks on BK8550 of the 8mm grade with 2mm wall-thickness or is it the 6mm that are common on many power supplies with 1mm thickness?
On East Testers programmable loads, it looks to vary depending on wattage and could look like its the 6mm wide/1mm metalthickness on ET5420 (2ch 20A pr. channel / ET5411 1ch 500V/15A) while 8mm/2mm metal-thickness on the 40A load (ET5410). https://cdn.globalso.com/easttester-cn/fu3.jpg
BK8550/TH8401 does look good, kudos for both sense & 4mm input jacks at the front.
mvno_subscriber:
--- Quote from: DaneLaw on June 15, 2024, 11:12:45 pm ---Where did you purchase it from? did it seem new when it arrived (like you were the first unboxing it) if not, it could indicate that its solely this unit, and some other buyer has been there with a "no thx, you're going back" and the reseller is trying their luck to find it a new home.
Are the 4mm protruding input jacks on BK8550 of the 8mm grade with 2mm wall-thickness or is it the 6mm that are common on many power supplies with 1mm thickness?
On East Testers programmable loads, it looks to vary depending on wattage and could look like its the 6mm wide/1mm metalthickness on ET5420 (2ch 20A pr. channel / ET5411 1ch 500V/15A) while 8mm/2mm metal-thickness on the 40A load (ET5410). https://cdn.globalso.com/easttester-cn/fu3.jpg
BK8550/TH8401 does look good, kudos for both sense & 4mm input jacks at the front.
--- End quote ---
I bought it from Elfa Distrelec. Funny you should mention if it had been a return item, I did wonder if it had been opened before when I unpackaged it, there was something.. but everything seemed well packed inside.
Regarding the banana jacks, I wasn't quite sure I understood the question, but with threads the outer diameter is 8mm (see pic). Feels pretty solid.
The knob that is screwed on also feels decent. Weighs in at 27g on my generic kitchen scale.
Martin72:
Every DC load or power supply unit should have such combined 4mm/screw terminals.
mvno_subscriber:
I wonder if something else is up with this unit. On the back, it has a BNC out to connect a scope. From the manual: "Connect an external voltmeter or oscilloscope to display the input’s current."
I've never used such a feature before and I couldn't find anywhere what it's supposed to read, but I assumed maybe 1V per amp or something? Anyway, its output is a third of that; 333mV per amp (on scope set to 1X = 1M input impedance). Is that normal? I've tried two different cables, same result, and double checked that my scope is not defunct.
Am I doing it wrong?
nctnico:
--- Quote from: mvno_subscriber on June 16, 2024, 06:31:36 pm ---I wonder if something else is up with this unit. On the back, it has a BNC out to connect a scope. From the manual: "Connect an external voltmeter or oscilloscope to display the input’s current."
I've never used such a feature before and I couldn't find anywhere what it's supposed to read, but I assumed maybe 1V per amp or something? Anyway, its output is a third of that; 333mV per amp (on scope set to 1X = 1M input impedance). Is that normal? I've tried two different cables, same result, and double checked that my scope is not defunct.
--- End quote ---
The Tonghui manual says it is a 0V to 10V output with 10V being full scale. So if the range (full scale) is 30A then the output will be 10/30 = 333.3mV/A which is exactly what you are measuring.
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