Products > Test Equipment

TTi MX100TP triple power supply teardown and review

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subsonik:
Hi guys,

Sorry to bump up this thread! But reading all this sparked my interest in the MX100TP, and even though it's quite a lot more than what I was wanting to spend, I just bought one :-+ You live only once, I guess.

I concur: nice device, stable and accurate. The user interface is very well thought through, I like it. Love the power reading (VxA) and the wide output ranges so I don't have to mess with serial/parallel connections anymore.

However: one thing is bugging me. Fan noise! :-\ When I first turned it on, the fan was spinning very quietly. However, after a while, the MX100TP warms up (even with all outputs OFF) and the fan speed increases to a level which is really too much for me. It reminds me of those old PC power supplies with an unregulated 80mm fan at full blast all the time.

I measured idle power consumption at a whopping 46 watts, which explains the considerable amount of heat, causing the fan to ramp up. Is this normal? I barely understand how they manage to dissipate 46 watts with all outputs OFF! Do you guys have similar behaviour? I'm almost hoping I have a defective device because I really like all the rest...

colorado.rob:
First time I heard fan noise from my MX100TP was this week when I had all three outputs running in parallel at 15A /14V to charge my car battery.

Robaroni:
Mine comes on then the fan quiets right down. I've left it on all day with no problem. Try moving to a different spot and seeing if it's reflected sound or something like that.

subsonik:
Do any of you have the possibility to check idle power consumption on your unit so we could compare? Mine pulls 46W with all outputs off @ 230VAC which seems fairly high considering what's inside.


--- Quote from: Robaroni on October 03, 2019, 08:43:01 pm ---Mine comes on then the fan quiets right down.
--- End quote ---
Same BUT after an hour or so of sitting idle, the device has warmed up (46W idle power needs to go somewhere) causing the fan to ramp up considerably.

Robaroni:
122 volts, 42 watts,  ~450ma at idle with no outputs on. Fan quiet.

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