DC Load Regulation and AC Ripple
DC Output Load Regulation
To simulate real world and maximum loading conditions, the EVGA SuperNOVA 1200 P2 power supply was connected to the load testers and supplied with a constant 115 VAC. In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads.
The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs. I have also included a second table of expanded tolerances (±1% to ±6%) for reference.
The following tables list the DC voltage results for the PSU while operating on 115 VAC, 60 Hz.
The SuperNOVA 1200 P2 produced excellent voltage regulation on all of the DC outputs and all of the measured values fell easily within the 2% tight voltage regulation range; very good!
AC Ripple and Noise on the DC Outputs
The amount of AC ripple and noise present on the DC outputs was checked using a digital oscilloscope. This AC component may be present in the KHz range where most switching power supplies operate or it may be more prevalent at the 60 Hz line frequency. We adjust the O-scope time base to look for AC ripple at both low and high frequencies. The ATX12V V2.2 specification for DC output noise/ripple is defined in the ATX12V Power Supply Design Guide.
Ideally we would like to see no AC ripple (repetitive) or noise (random) on the DC outputs – the cleaner the better! But in reality there will always be some present. I measured the amplitude of the AC signal (in millivolts, peak-to-peak) to see how well the power supply complied with the ATX standard. The following table lists the ripple/noise results during all of the load tests for the main output voltages of interest.
The 1200 P2 power supply exhibited outstanding AC ripple suppression on all of the primary outputs, all the way up to full load; again – very good!
G2 were already really good
G2 were already really good PSU’s
They should at least include individually sleeved and not having to pay an extra $90
That name, I guess whoever
That name, I guess whoever owns Data General, and the Nova 1200(or supernova) branding has let it lapse, but we had a Nova 1200 Minicomputer at Jr. College, and you had to toggle the bootstrap program in(In Octal) on the front control panel’s toggle switches, and then it would load the OS, from paper tape, to then load the BASIC/other languages, into the limited core(little iron{mostly} donuts with wires treaded through them) memory. All hooked up to some teletype keyboard/printers, oh those sounds, and long round keys, with about a miles worth of key travel. You could not hear the fans blasting the hot air out of the cabinet over those teletypes, and other line printer, dot matrix printer noises, including the rapid fire thunks of the card readers, reading in the latest batch processing Fortran IV, COBOL, and other jobs. Paper and Card stock, was big in them days, and everybody knew what a Chad was, Now get off of may lawn! Little Billy Gates!
edit: treaded
to:
edit: treaded
to: threaded
Damn infernal auto spelling/correcting,!