Products > Test Equipment
E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A)
adamgreig:
For comparison this is the E36312A ch1 short circuited into the 34465A. The readback error is better than ±0.1mA and the difference to the DMM is better than ±0.3mA (except at the 1mA setpoint). The errors stay well within a 1mA up to 1A output.
edit: I tested with an LED in series too, no difference. I can't reproduce the problem Ahrenp had.
Dubbie:
Thats more in line with what I would expect adamgreig.
Looks like about 1/3 the error of the Rigol.
I wonder what Ahrenp's problem was? Maybe a hardware fault.
Here is the Rigol error graph for direct comparison:
Ahrenp:
Upon further testing, it would seem that the threshold to go into CC mode is around 10mA.
If I connect an LED across the output and set the supply to some voltage below the LEDs expected forward voltage at 10mA, supply current set to 10mA, and then start turning up the voltage, the supply will stay in CV mode and the current will rise to >20mA before CC mode kicks on and brings the voltage down. In my previous test with blue LEDs my 5V set-point was not high enough to drive more than 20mA through the LED and therefore the supply stayed in CV mode. If I had set my voltage higher, >>Vf of my blue LEDs, I would not have had an issue. Once CC mode is enabled programming/readback accuracy are within spec.
Still not impressed with the spikes on the output when plugging it in/turning on the power bar though.
HighVoltage:
I just tested my E36312A with the following conditions:
All 3 Channels turned OFF
All 3 Channels set to 0.000V
Channel 1 set to 5A
Channel 2 set to 1A
Channel 3 set to 1A
Then I hooked up my 34470A to measure the voltage and current spike, when the instrument is connected to mains power. (Turning mains 230V suddenly ON).
Here are the results:
Channel 1 Voltage Spike: 3.69 V
Channel 2 Voltage Spike: 1.97 mV
Channel 3 Voltage Spike: 8.02 V
Channel 1 Current Spike: 1.95 A
Channel 2 Current Spike: 2.50 mA
Channel 3 Current Spike: 485 mA
HighVoltage:
Here is a current output profile, captured with a scope and current probe after a sudden mains turn-ON of the PSU.
Again, voltage set to 0.0 and current set to 5.0
There are two spikes in the current, >12.7A
Well, as long as we know, not to turn the PSU ON while it is connected to a circuit, all should be OK
But it would be nice, if Keysight could fix this problem through a FW update.
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