Author Topic: R&S®HM C8041/8042/8043 Power Supply  (Read 14807 times)

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Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #25 on: December 26, 2015, 06:27:16 pm »
I think it has front panel automation but I'm not sure if it has LXI or USB programability through a PC. It may be linear also, although switching supplies done right don't trouble me the way they did 10 years ago.

It's pretty rare that I need the programming option but it is nice to have. I like the size of the R&S along with the resolution so I'm leaning toward it. Elektor did a review and found overshoot on power down but I thought it was basically a silly test. They shut off the mains to simulate a power failure. Well, gee it had a 1.1 volt overshoot! The "soft" off button didn't show any overshoot.

I guess if you leave it in a remote location powered up for months mains failures might be a problem but I still think it's a stretch.

Rob
 

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #26 on: December 29, 2015, 04:46:55 pm »
WooHoo


Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #27 on: December 29, 2015, 05:44:39 pm »
OK, that's it! I'm getting one!
 

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #28 on: December 29, 2015, 07:58:50 pm »
Peak inside.

Power supply caps are Nippon Chemi-Con, main board caps are Matsushita/Panasonic.   :-+

Build quality is top notch.

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #29 on: December 29, 2015, 08:04:36 pm »
And one last pict with the PS removed:


Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #30 on: December 29, 2015, 08:21:57 pm »
Ok, one more, PS is an off the shelf unit:


Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #31 on: December 29, 2015, 09:18:47 pm »
OK, could be built to Hameg's specs. but could be a game changer depending on how well the unit functions and build quality.

Rob
« Last Edit: December 29, 2015, 09:52:32 pm by Robaroni »
 

Offline anotherlin

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #32 on: December 30, 2015, 09:02:55 am »
I guess the 48V switch mode supply is so they can replace a bulky and heavy 200VA transformer.
In the end, the supply outputs are linearly regulated, so I don't think that's much of problem.
"Lots of people have made $100K or more mistakes and didn't get the boot. It's called training, why fire them after such an expensive lesson?" -- EEVblog Electronics Community Forum
 

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #33 on: December 30, 2015, 11:56:40 am »
OK, could be built to Hameg's specs. but could be a game changer depending on how well the unit functions and build quality.

Yeah, this doesn't bother me at all, standard practice with just about any manufacture these days, and it's well built.

I guess the 48V switch mode supply is so they can replace a bulky and heavy 200VA transformer.
In the end, the supply outputs are linearly regulated, so I don't think that's much of problem.

It appears to be 48V SMPS > Variable SMPS > Linear Reg > Output.

I pretty much took it apart yesterday and had to leave, more paying today.  If this performs well I will replace my other random supplies with more of these.

Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #34 on: December 30, 2015, 02:16:33 pm »
If this performs well I will replace my other random supplies with more of these.

That's my problem too, I just counted 7 supplies here. I'll leave the old 24V, 20A brute force HP, the HV supply and the HP 6632B super accurate supply but I really need bench space.
Rob
 

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #35 on: December 30, 2015, 07:06:21 pm »
Not much of a test, but I am seeing about 1mVpp ripple on the 8043, vs about 20uVpp on my trusty E3610A, as read by a DMM7510.  (Instrument spec is 450uVrms/4mVpp)

I don't expect perfection with an upstream SMPS, but FYI for potential buyers.


Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #36 on: December 30, 2015, 07:59:12 pm »
Not much of a test, but I am seeing about 1mVpp ripple on the 8043, vs about 20uVpp on my trusty E3610A, as read by a DMM7510.  (Instrument spec is 450uVrms/4mVpp)

I don't expect perfection with an upstream SMPS, but FYI for potential buyers.

I have a 3610A too. I think it has a bad cap, the current set does go to zero until it warms up, maybe noise somewhere in the settting circuit.
 

Offline Robaroni

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #37 on: December 30, 2015, 08:18:32 pm »
I just compared specs with the Keysight U8031A and the R&S are just as good or better. First, it's a real triple supply not like the Siglent(which I wouldn't buy regardless) or the Keysight.

I'm still thinking it might work for me. How noisy is the fan? Loud fans kill me, I sold a 34410A because I hated the fan noise. Fortunately they fixed it on the 34465A.

Rob
 

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #38 on: December 30, 2015, 08:26:59 pm »
Loud fans kill me, I sold a 34410A because I hated the fan noise.

The fan is thermo controlled, you can briefly hear it spin up on boot, then it shuts off.  So far I've only seen it cycle on low, I didn't even hear it, just noticed it spinning cause the cover was off.

I'll try and load up all 3 channels, see what happens.

Offline dr.diesel

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #39 on: December 30, 2015, 09:13:18 pm »
So it's been sitting on 65 watts total for about 20 min now, fan is running constantly on what I'd guess is low, which is not audible.

I was also navigating the setup menu and somehow managed to reboot it, came back up defaulted.  I've not been able to repeat since.

Offline Messtechniker

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #40 on: October 23, 2016, 02:04:45 pm »
After having put my new R&S HMC 8043 lab psu through its paces
over the last few days, here now some remarks:

To start with, I am absolutely satisfied with the unit.
Even so, there is some room for improvement.

1. The manual is not particularly clear as to invoking of
the overvoltage protection adjustment menu. Specifically
the ADV (Advanced) button is not mentioned in this context.

2.) The virtual COM port settings 7,N,N,1 and the default
LAN port (I think the default was 5026 which I changed to 5025)
are not mentioned in the manual. I found out the virtual COM port
settings by running the HM Explorer and detecting HMC 8043 though
a virtual COM port.

3.) Since the 3 outputs can be connected in series, I would have
been pleased to find 2 bridging plugs with a tap socket in the box.

4.) Instead of only displaying “OVP” when it is on, I would be
nicer, if the actual OVP voltage setting would be displayed.

5.) When wanting to remotely control the unit using a potentiometer
(analogue control) you will need an external 10 V source. A built-in
fixed 10 V output (on the rear) would simplify such an arrangement.

Also did a bit of programming with “Profilab”. You can find a current
logging example here:
http://forum.abacom-online.de/phpBB3/viewtopic.php?f=96&t=4482

Agreed, the unit is expensive, but it is well designed and operation is very
user friendly. It comes with a calibration certificate. And it fits – frog style –
without the risk of slipping on top of my 33465A. See pic.

Yours  Messtechniker



Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Peaktech 2025A, Voltcraft VC 940, M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers, DL4JAL Transistor Curve Tracer, UT622E LCR meter
 

Offline Weston

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #41 on: October 21, 2020, 10:08:50 pm »
Has anyone with one of these power supplies observed that the supply outputs are temporarily enabled when you turn off the power supply from the front panel?

From my observations on channel 1 of my HMC8042 I see that when I turn it off ~2/3 of the set voltage appears on the output, the waveform looks like its the output capacitors discharging.

This is concerning behavior as if you change what is connected to the power supply and then turn off the supply without changing the set voltage it could fry something. I wonder (hope) this can be fixed in software. The front power button is in software, so it should be something as simple as sequencing the internal supplies to 0V before actually shutting off.

Attached are waveforms of the unloaded, and loaded with a 22 ohm resistor, when the supply is set for 5V and 32V.



 

Offline Messtechniker

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #42 on: October 24, 2020, 05:46:06 am »
My HMC 8043 with "MASTER OFF" and upon powering down with "POWER" it produces a peak:

No load:
Voltage setting/Power down peak
 +32 V /8V
 +15 V /+3.5 V
   +9 V/+1.6 V
   +3 V/+0,1 V

And with a 22 Ohm load:
 +32 V /+0.4V
 +15 V /+38 mV
   +9 V/+48 mV
   +3 V/-7 mV

 Measured using the trend display function of my 34465A.

Basically nothing to grumble about.

The scope shows more:





PS. Not many users here have a HMC 803X power supply. So you will not get much of a response.




 
« Last Edit: October 24, 2020, 06:10:18 am by Messtechniker »
Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Peaktech 2025A, Voltcraft VC 940, M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers, DL4JAL Transistor Curve Tracer, UT622E LCR meter
 

Offline Weston

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #43 on: October 26, 2020, 05:24:13 am »
I am a bit confused by your listed values of the power down peak given the scope screenshots you posted. The picture you posted that is titled "32V 22 Ohm.jpg" shows a 13.7V peak based on the cursors, which is pretty much in line with the measurements I have taken.

If I connect some 5V or 3V3 logic circuit to the output, set the max voltage of 32V, and shut down the power supply without ever enabling the output, I would not be surprised if the output spike damages what is connected.
 

Offline Messtechniker

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #44 on: October 26, 2020, 10:02:48 am »
Of course you are right. This 13 V spike might certainly damage 3.3 V or 5 V powered circuits. If you can confirm this by damaging a 3.3 V powered test circuit you should inform R&S. I have a good contact there.
Since I don't usually use 3.3 V powered circuits, I have none at hand at the moment. However, my next order, probably by the end of November, will include some.
Agilent 34465A, Siglent SDG 2042X, Hameg HMO1022, R&S HMC 8043, Peaktech 2025A, Voltcraft VC 940, M-Audio Audiophile 192, R&S Psophometer UPGR, 3 Transistor Testers, DL4JAL Transistor Curve Tracer, UT622E LCR meter
 

Offline Thomas

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #45 on: October 26, 2020, 11:33:41 am »
The scope shows higher values because it samples faster.
 

Offline S. Petrukhin

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Re: R&S®HM C8041/8042/8043 Power Supply
« Reply #46 on: October 26, 2020, 12:04:19 pm »
 :)
And sorry for my English.
 


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