Products > Test Equipment
E36300 Series Programmable DC Power Supplies (E36311A, E36312A, E36313A)
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HighVoltage:
One partial workaround ...

In series mode between CH2 and CH3, if you only use the output of CH2 and connect noting to CH3, the current will not increase by 10%.
But you are limited to 25V, so it defeats the purpose of series mode.
If you want above 25V output, you need to hook your cables up between CH2 and CH3 and the current may increase by 10% in all settings I tested.

Well, I would assume that these series mode inconsistencies can all be fixed by firmware and they are not hardware related.


Would be nice to get a statement from Keysight!
rsjsouza:

--- Quote from: nctnico on January 22, 2018, 06:47:02 pm ---
--- Quote from: nctnico on January 22, 2018, 03:44:47 pm ---
--- Quote from: nctnico on January 11, 2018, 06:50:15 pm ---I ordered a E36313A as well and delivery is confirmed Januari the 26st. Perhaps this model is produced in lower quantities or more popular than expected.

--- End quote ---
Mine arrived today so that is slightly ahead of schedule. I'm going to update the firmware first and do some tests.

--- End quote ---
As expected channel 1 still has a spike for several hundred ms when mains are applied: 7.7V when loaded with 820 Ohm and 12A when shorted.

--- End quote ---
Nico, the spike you are getting is coming when you power on the power supply or when you turn on the channel?

I tried to reproduce this on my E36312A (still with the original FW) and could not see anything on the output when the PS is turned on (the channel output is off anyways)

When switching on channel 1 with a load of 500\$\Omega\$ on 6V, I got the following:


When switching on channel 2 with the same load, the results were similar:


When switching on either channel 2 or 3 with the same load but with 25.75V, I got the following:

nctnico:

--- Quote from: rsjsouza on March 08, 2018, 04:13:55 pm ---
--- Quote from: nctnico on January 22, 2018, 06:47:02 pm ---
--- Quote from: nctnico on January 22, 2018, 03:44:47 pm ---
--- Quote from: nctnico on January 11, 2018, 06:50:15 pm ---I ordered a E36313A as well and delivery is confirmed Januari the 26st. Perhaps this model is produced in lower quantities or more popular than expected.

--- End quote ---
Mine arrived today so that is slightly ahead of schedule. I'm going to update the firmware first and do some tests.

--- End quote ---
As expected channel 1 still has a spike for several hundred ms when mains are applied: 7.7V when loaded with 820 Ohm and 12A when shorted.

--- End quote ---
Nico, the spike you are getting is coming when you power on the power supply or when you turn on the channel?

--- End quote ---
The spike occurs when you plug the mains in.
rsjsouza:

--- Quote from: nctnico on March 08, 2018, 04:21:07 pm ---
--- Quote from: rsjsouza on March 08, 2018, 04:13:55 pm ---
--- Quote from: nctnico on January 22, 2018, 06:47:02 pm ---
--- Quote from: nctnico on January 22, 2018, 03:44:47 pm ---
--- Quote from: nctnico on January 11, 2018, 06:50:15 pm ---I ordered a E36313A as well and delivery is confirmed Januari the 26st. Perhaps this model is produced in lower quantities or more popular than expected.

--- End quote ---
Mine arrived today so that is slightly ahead of schedule. I'm going to update the firmware first and do some tests.

--- End quote ---
As expected channel 1 still has a spike for several hundred ms when mains are applied: 7.7V when loaded with 820 Ohm and 12A when shorted.

--- End quote ---
Nico, the spike you are getting is coming when you power on the power supply or when you turn on the channel?

--- End quote ---
The spike occurs when you plug the mains in.

--- End quote ---
Wow... Ok. I don't think this can be fixed by firmware - the standby circuit is probably taking too long to kick in when powered.
LaurentR:
I got some basic answer from Keysight, but it'll take some more back and forth. I have pointed them to the thread.
Apparently, the fw change on series mode was related to OCP, not to anything like this.

Main issue update

I put the electronic load into service (CR mode) to put some more variety of loads on the supply and the issue is present all over up to 50V.

Basically, in CC mode, it seems that whenever the output voltage is less than approximately half the Set Voltage on the PSU, the PSU "silently" outputs 10% more current. That's a pretty broken CC mode.


"Manual" series mode

While at it, I tried the "manual" series mode as suggested by HighVoltage, i.e. connecting Ch2 and Ch3 externally and setting them to the same Set Voltage/Current (I also enabled tracking mode, but it shouldn't have any impact).

I don't see the issue, but Ch3 insists on being a drain (negative voltage). All voltages (including the negative one on Ch3) are confirmed by an external DMM.
This looks weird and I don't know if this is normal/expected behavior (I was expecting Ch2 and Ch3 to be more symmetric than this) and if it may be related to the main issue. At least, it's functionally correct overall.
I put the electronic load on it and Ch3 stays at -200mV all the way until Ch2 gets to 25V and switches to CV mode. Then Ch3 "takes overs" and voltage starts increasing from -200mV all the way to 25V, then it switches to CV mode...

Screen capture of the "manual" series mode (i.e. externally hooked up, same Set Voltage/Current) at the extreme where Ch2 has switched to CV mode and Ch3 is still lingering in CC mode with a negative voltage (2R4 load):
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