EEVBlog #862 - BK Precision 8601 DC Electronic Load

[jitter]

I've just bought IT8513C+, 120V, 120A, 600W, half width for 5600 RMB(equivalent to 867 USD) including p&p.
The functionality seems to be the same as BK Precision 8601. I installed two wooden feet at rear so that it stands on the floor.

Nice!
120 A / 600 W in this form factor? Would you consider popping the cover and posting a few photos?

[deepskyridge]

Where does one find the big beefy binding posts used on these units. I have searched but cannot find them. ?

Thanks
Gary

[Fungus]

Where does one find the big beefy binding posts used on these units. I have searched but cannot find them. ?

I don't know about those but the audio loudspeaker world makes some big binding posts.

eg. http://www.ebay.com/itm/390857472929

[Macbeth]

I've just bought IT8513C+, 120V, 120A, 600W, half width for 5600 RMB(equivalent to 867 USD) including p&p.
The functionality seems to be the same as BK Precision 8601. I installed two wooden feet at rear so that it stands on the floor.

Nice!
120 A / 600 W in this form factor? Would you consider popping the cover and posting a few photos?

I would like to see the insides too. Looking at the rear I am guessing the same well known BK, Maynuo, ITech board of old we know well, but with dual fans on each heatsink extrusion, front and back. Maybe 

[zlymex]

I've just bought IT8513C+, 120V, 120A, 600W, half width for 5600 RMB(equivalent to 867 USD) including p&p.
The functionality seems to be the same as BK Precision 8601. I installed two wooden feet at rear so that it stands on the floor.

Nice!
120 A / 600 W in this form factor? Would you consider popping the cover and posting a few photos?

Thanks. But I'm afraid the opening of the cover will void the warranty, there is a sticker to protect the cover from removing.

Where does one find the big beefy binding posts used on these units. I have searched but cannot find them. ?

Thanks
Gary

I bought some of these and they seems better than those on the e-load, at least stronger and heavier. There is a hole for banana plug that Dave desperately needs.
http://www.aliexpress.com/item/3pc-lot-3-color-100A-Power-Amplifier-Binding-Post-Terminals-TO-BANANA-PLUGA-Test-Probes/1198898706.html

I would like to see the insides too. Looking at the rear I am guessing the same well known BK, Maynuo, ITech board of old we know well, but with dual fans on each heatsink extrusion, front and back. Maybe 

I found some inside photos from one of my friends.

[Thomas]

The 8513+ seems to be ~99mm deeper than the 150/300W versions, see 8500+ series datasheet: http://www.itechate.com/Upload/File/20150806091844.pdf
It also looks like it has more transistors on the heatsinks. That would explain the increased power handling capability.

[jitter]

I found some inside photos from one of my friends.

Thanks for the look inside.

Mostly it looks good, but I don't like the messy wires in the back.

Compared to Dave's BKP 8601, I'd say this comes from the same design, but has been modified for the higher load capability.
Some differences I see straight away are in the mains wiring and the transformer. On Dave's BKP the mains comes in the back and travels across wires to the front; the transformer is shielded. On this one, the mains travels through the PCB and the transformer is not shielded.

The 8513+ seems to be ~99mm deeper than the 150/300W versions, see 8500+ series datasheet: http://www.itechate.com/Upload/File/20150806091844.pdf
It also looks like it has more transistors on the heatsinks. That would explain the increased power handling capability.

Thanks, that would indeed account for the higher dissipation capabilities.

[the_mighty@420]

Can any body tell me is this resistor for balancing the MOSFET and if it is for balancing then the maximum current flowing through one MOSFET is 6 Amps and value of balancing resistor is 5.8 ohms so this resistor must be of 6*5.8 = ~35W. 

[Brumby]

If you are referring to the resistor outlined - I don't often work with such values, but that looks to me like a 0.05 ohm 5% wire wound.  If so, 6A through that gives 0.3W.