This is a simple isolation transformer that seems to work well. There are two sockets that are isolated and two sockets that are not. They are clearly marked. I checked the voltage output on the isolated sockets and they are within 0.15 volts of the input under no load at 120 v nominal. There is a very slight and barely audible transformer hum at zero load. However, this should not be an issue for most situations. Be aware however, that the ground lugs on the isolation sockets ARE connected to the ground lugs on the non-isolated sockets. Thus it is not a truly isolated transformer for tech bench purposes. This transformer will not "float" your oscilloscope.
My only complaint is that the transformer's case was slightly bent and paint damaged on two of the four corners. It was not due to shipping as it was double boxed and did not have obvious shipping damage. It must have been that way from the factory - disappointing cosmetic quality.
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Quite a nice unit but loose parts rattling inside
I do like the unit though when I received mine things were shifting and rattling inside the unit. After checking it out on the outside there were 4 screws on the bottom that were VERY loose and shifted about a 1/4 of an inch side to side and top to bottom that seemed to hold the transformer. I decided that since it was a simple unit I would go ahead and open it up to tighten up the loose screws and nuts. I included a couple of pictures showing the transformer and a closeup of one of the 4 loose nuts. They were mostly just started on the screw and needed several turns to get close to tight. As you can see with a screw and nut inside the unit there was no way to screw it tight without opening the case.Once I had it apart I drew an electrical schematic for it so I knew how it was all connected. it is a nice design and I am happy with it now that it is structurally sound. They definitely need to improve their final inspection process though so I took off two stars for that.Opening it up did explain why they have a 14 amp input and 7 amp output fuse for the transformer. There are 4 outlets on the box. Two of those are for the isolation transformer output and work with the switch and 7 amp fuse. The other two outlets are protected by the 14 amp fuse which also feeds the input of the transformer but there are otherwise a direct connection to the input power like an extension cord. Anyway hopefully they will improve their final inspections and thus expect 5 star ratings in the future.
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Be aware that the isolation side of the transformer, that is the left two receptacles in back of the front panel are grounded. You can see the common bare ground wire tying all 4 receptacles (2 isolated, 2 direct to main) together. The 2 isolated receptacles (left) would need to be disconnected from ground for true isolation (ie, oscilloscope protection from DUT).Reviewed in the United States on November 16, 2020
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