Hi, I didnot realize you tested the RD6006 full load for 24 hrs. That is perfect . Now you know the stability and reliability. I do enjoy watching your video's, those have great technical detail, with proof and why you have done modifications and changes. You take your videos to a much more interesting, educational and higher level. I am missing that in TH-cam presentation from others, unboxing , sloppy reviews, which really aren't reviews or cutting and installing wires is not that interesting. Keep it up!
Thanks, I try to test everything I do for at least 24 hours (frequently longer) as I want to give information that is useful. I only show a small amount of the testing of course as it would be very dull to show all of it. My channel is not monetised so I do not make any money from it and this means that I can take a lot of time making videos. On average they take around 24-48 hours each to make. Happy that you are enjoying them.
Re: Load. I tested my KP184 with 70VDC @ 3A (just barely below 210W) at a lab power supply from BK Precision (BK9174) and the Kunkin's case gets quite warm to the touch after a hour on-time or so. Almost double the load (400 W) might be really the max, what can be handled by the unit. It will be on the verge of usability (and capability) with loads >10 (Amperage) times as much (up to 40A) and only at low voltages of about 10VDC as long as 400W have not been exceeded. The fan is currently (at those values stated) running probably already at (almost ?) max speed, considering its noise level, and the air blown out is quite warm at the rear end of the unit. For more power you might need either a much more expensive load (specifications ?) or at least double or tripple the KP184 used in some way. Note: The lowest voltage on my unit displayed had been 0.3VDC. PS.: Re. My prior post. I checked the intermediate voltage and current adjustments discussed before and couldn't find a way to input anything there except pressing "SET", thus I couldn't adjust the "Kunkin display to match the actual value" as stated, although my unit is brand new (built date October 2021) and equipped with the latest firmware version. The Grossman calibration document unfortunately doesn't elaborate on this or is - to my understanding - rather unspecific in its description about this.
I just bought a KP184 and it came with a slight dissalignment in the display . The mask in the right part of it is a little shifted I would like to know how to dissasemply it and realign Thanks any answer
Hi, I got a calibration document for the KP184 from the website of Chris Grossman I think, but some parts of the calibration procedure stated in the provided document are not clear to me, especially the part about the DAU-adjustments (?) after the "cross" voltage and current settings. What exactly are the "Ctu1, Cuv2, Cuv3, Cuv4" adjustments and how are they measured or set or whatever in reality ? What do you mean by "setting the voltage source to 6V" (power supply display ?) and further on the other mentioned "thresholds" ? Same holds true for the current adjustments "Cta1, Cta2, Cta3, Cta4". This part of the Grossman calibration document is unclear to me... Note: English is not my native tongue...
At each calibration step you need to set the input current / voltage close to the value specified in the document. You then adjust the Kunkin display to match the actual value you are applying. At the end the Kunkin uses the values to calculate an accurate calibration curve.
@@JerryWalker001 Hi, sorry to bother You again, but I checked the Chris Grossman "Calibration" document (internet) against your description and under adjustments it states for those second tier adjustments (DAU-adjustments ?), that "...calibrated measuring equipment is no longer required here. (what do i have to use as a reference then...?) The respective adjustment values are determined by searching for the control insert (?) with external supply of the controlled variable. If the operating point of the control is set to stable (?), this value is accepted by pressing the SET key. (totally unclear to me). Both values of the value pair are required to define a specific characteristic curve. In principle, the individual characteristic curves can also be determined separately from each other or fine-tuned afterwards." (what does that mean ???) If you look at the calibration procedure on the last page of this document, the decription seems to be somewhat differently described. Whilst voltage and current calibration seem to be quite clear to me, the others are not. That confuses me. Unfortunately you left those adjustments out in your video, so I can't have a look, how You actually did it...
I had a KP184 load, this had started to display a voltage from about 9V. I sent the device back to china. if i had had the information of the calibration i would have progressed. the dealer could not help me ...
Excellent. I have been looking for affordable load for my personal use and your videos have convinced me that this is the unit for me. Do you have a copy of the calibration procedure or a link to where it could be found? Thank You!
It is done in the same was as the voltage calibration (selecting the current settings) but you need a current source that can go to 40A. I would not advise trying to do the current calibration unless you have a suitable current source as the unit expects a certain range of values and if you run the calibration over the wrong range then the unit may not work properly.
@@JerryWalker001 Mind if I ask what did you use for the 40A current source? I have a problem with my load (it has a consistent offset error of 10mA and I really need to re-calibrate).Thanks:)
@@p8051a I used one of the KP184's to control the current from a 60V 50A linear supply. I set it to constant current and used it to control the current being fed into the unit I was calibrating. The supply was connected via a calibrated current meter. I could then use the second KP184 to adjust the current required to calibrate the first unit. In other words I had everything connected in series (Supply, Reference meter, KP184-1. KP184-2).
@@JerryWalker001 Thanks! I was thinking to get a second KP184 and now I have a good excuse.! I have a high current supply but I don't think I have a meter accurate enough to trust at 40A maybe my Uni-t ut210 could do it but even if it doesn't I could fix the calibration on my first unit by getting a second one and try to get them close to one another.Keep up the great work.I love your channel:) Thanks again!
Thank you for showing the calibration procedure. Because of your videos about RD6006 I ordered a KP184. As I do not own a Voltage/Current Source, which is accurate enough and is capable of providing 80V, I am unable to calibrate the KP184 myself. I have another question: In the upper part of the video scene, I can see three DPS5005 power supplys. Why do you have three and how do you power them? I ask since you build a linear power supply for the RD6006.
I frequently need to have floating supplies when I am repairing and testing equipment. The 3 supplies in the centre of the bench are supplied from independant floating linear supplies which are located underneath the bench. I use them for general purpose floating supplies. This allows me to use them as totally floating supplies without tying up my main bench supplies. I am also frequently working on more than one project at the same time and some tests need to be left running for extended periods and so I can use these supplies (and others that I also have) to power them without having to stop the other work. Bear in mind that if each can supply 30V then I can wire them all in series to get 90V (for example to calibrate a KP184) if I did not have another way to do that.
It works over quite a wide range. 10V / 60V for example but if you go too far you will see very incorrect voltages so it should be obvious if they values entered are too far out. Also the closer the values are together the less accurate it may be. If you are only calibrating voltage then an RD6006 or similar could be used. Alternatively a number of laptop supplies or similar in series would work just as well. The input voltages do not need to be accurate, just reasonably stable as the actual voltage is entered so 8.9V and 63V (for example could be used).
But if I want more or less reliable readings then I need a voltmeter which is trustful. The best I have is a Siglent SDM3045X 4,5 digit bench-multimeter. I have another question regarding the measurement of the RD6006's ripple you showed in another video. What kind of capacitor did you use to block the DC portion of the signal? It looks like a tantalum capacitor. Is the value of the capacitor important?
My power supply can only go up to 60 V, and my personal hobby projects never go above 24 V at maybe 0.5 A. Is there any downside to calibrating it for these ranges, or does the calibration have to take place at high voltage/amps? I also have the KP182, not the KP184. Is the calibration procedure exactly the same?
Yes it is an impressive piece of equipment although I have to confess that I have not checked every step :) Having a max output of 110V also makes it useful for things that my bench supplies cannot manage.
I tested all the way up to 400W and it was fine. There is quite a good heatsink and fan assembly inside. I only go to approx 350W in the video I posted when I was using it to test the RD6006 but I tested it at full power for 24 hours and it handled it very well. They are not as small as they look.
Hello Jerry, Here is a helpful link to the stability problem of the Kunkin www.eevblog.com/forum/testgear/fixing-an-manufacturer-issue-of-the-kunkin-kp184-electronic-load/ and th-cam.com/video/NKwUACkCcFs/w-d-xo.html Hans
Hi, I didnot realize you tested the RD6006 full load for 24 hrs. That is perfect . Now you know the stability and reliability. I do enjoy watching your video's, those have great technical detail, with proof and why you have done modifications and changes. You take your videos to a much more interesting, educational and higher level.
I am missing that in TH-cam presentation from others, unboxing , sloppy reviews, which really aren't reviews or cutting and installing wires is not that interesting. Keep it up!
Thanks, I try to test everything I do for at least 24 hours (frequently longer) as I want to give information that is useful. I only show a small amount of the testing of course as it would be very dull to show all of it. My channel is not monetised so I do not make any money from it and this means that I can take a lot of time making videos. On average they take around 24-48 hours each to make. Happy that you are enjoying them.
Can you please share the link you got to the full calibration procedure including the crossover?
Hello Can you please share it?
Re: Load.
I tested my KP184 with 70VDC @ 3A (just barely below 210W) at a lab power supply from BK Precision (BK9174) and the Kunkin's case gets quite warm to the touch after a hour on-time or so. Almost double the load (400 W) might be really the max, what can be handled by the unit. It will be on the verge of usability (and capability) with loads >10 (Amperage) times as much (up to 40A) and only at low voltages of about 10VDC as long as 400W have not been exceeded. The fan is currently (at those values stated) running probably already at (almost ?) max speed, considering its noise level, and the air blown out is quite warm at the rear end of the unit. For more power you might need either a much more expensive load (specifications ?) or at least double or tripple the KP184 used in some way. Note: The lowest voltage on my unit displayed had been 0.3VDC.
PS.: Re. My prior post. I checked the intermediate voltage and current adjustments discussed before and couldn't find a way to input anything there except pressing "SET", thus I couldn't adjust the "Kunkin display to match the actual value" as stated, although my unit is brand new (built date October 2021) and equipped with the latest firmware version. The Grossman calibration document unfortunately doesn't elaborate on this or is - to my understanding - rather unspecific in its description about this.
I just bought a KP184 and it came with a slight dissalignment in the display . The mask in the right part of it is a little shifted I would like to know how to dissasemply it and realign
Thanks any answer
Hi, I got a calibration document for the KP184 from the website of Chris Grossman I think, but some parts of the calibration procedure stated in the provided document are not clear to me, especially the part about the DAU-adjustments (?) after the "cross" voltage and current settings. What exactly are the "Ctu1, Cuv2, Cuv3, Cuv4" adjustments and how are they measured or set or whatever in reality ? What do you mean by "setting the voltage source to 6V" (power supply display ?) and further on the other mentioned "thresholds" ? Same holds true for the current adjustments "Cta1, Cta2, Cta3, Cta4". This part of the Grossman calibration document is unclear to me...
Note: English is not my native tongue...
At each calibration step you need to set the input current / voltage close to the value specified in the document. You then adjust the Kunkin display to match the actual value you are applying. At the end the Kunkin uses the values to calculate an accurate calibration curve.
@@JerryWalker001 Hi, sorry to bother You again, but I checked the Chris Grossman "Calibration" document (internet) against your description and under adjustments it states for those second tier adjustments (DAU-adjustments ?), that
"...calibrated measuring equipment is no longer required here. (what do i have to use as a reference then...?)
The respective adjustment values are determined by searching for the control insert (?) with external supply of the controlled variable. If the operating point of the control is set to stable (?), this value is accepted by pressing the SET key. (totally unclear to me). Both values of the value pair are required to define a specific characteristic curve. In principle, the individual characteristic curves can also be determined separately from each other or fine-tuned afterwards." (what does that mean ???)
If you look at the calibration procedure on the last page of this document, the decription seems to be somewhat differently described. Whilst voltage and current calibration seem to be quite clear to me, the others are not. That confuses me. Unfortunately you left those adjustments out in your video, so I can't have a look, how You actually did it...
How About sharing the link for calibration!?
I had a KP184 load, this had started to display a voltage from about 9V. I sent the device back to china. if i had had the information of the calibration i would have progressed. the dealer could not help me ...
Excellent. I have been looking for affordable load for my personal use and your videos have convinced me that this is the unit for me. Do you have a copy of the calibration procedure or a link to where it could be found? Thank You!
Hello, thanks for sharing, do you have a video about the basic current calibration procedure or how is it done?
Thanks greetings
It is done in the same was as the voltage calibration (selecting the current settings) but you need a current source that can go to 40A. I would not advise trying to do the current calibration unless you have a suitable current source as the unit expects a certain range of values and if you run the calibration over the wrong range then the unit may not work properly.
@@JerryWalker001 Could you tell me some model that was suitable?
Thanks greetings
@@JerryWalker001 Mind if I ask what did you use for the 40A current source? I have a problem with my load (it has a consistent offset error of 10mA and I really need to re-calibrate).Thanks:)
@@p8051a I used one of the KP184's to control the current from a 60V 50A linear supply. I set it to constant current and used it to control the current being fed into the unit I was calibrating. The supply was connected via a calibrated current meter. I could then use the second KP184 to adjust the current required to calibrate the first unit. In other words I had everything connected in series (Supply, Reference meter, KP184-1. KP184-2).
@@JerryWalker001 Thanks! I was thinking to get a second KP184 and now I have a good excuse.! I have a high current supply but I don't think I have a meter accurate enough to trust at 40A maybe my Uni-t ut210 could do it but even if it doesn't I could fix the calibration on my first unit by getting a second one and try to get them close to one another.Keep up the great work.I love your channel:) Thanks again!
Thank you for showing the calibration procedure. Because of your videos about RD6006 I ordered a KP184. As I do not own a Voltage/Current Source, which is accurate enough and is capable of providing 80V, I am unable to calibrate the KP184 myself. I have another question: In the upper part of the video scene, I can see three DPS5005 power supplys. Why do you have three and how do you power them? I ask since you build a linear power supply for the RD6006.
I frequently need to have floating supplies when I am repairing and testing equipment. The 3 supplies in the centre of the bench are supplied from independant floating linear supplies which are located underneath the bench. I use them for general purpose floating supplies. This allows me to use them as totally floating supplies without tying up my main bench supplies. I am also frequently working on more than one project at the same time and some tests need to be left running for extended periods and so I can use these supplies (and others that I also have) to power them without having to stop the other work. Bear in mind that if each can supply 30V then I can wire them all in series to get 90V (for example to calibrate a KP184) if I did not have another way to do that.
It works over quite a wide range. 10V / 60V for example but if you go too far you will see very incorrect voltages so it should be obvious if they values entered are too far out. Also the closer the values are together the less accurate it may be. If you are only calibrating voltage then an RD6006 or similar could be used. Alternatively a number of laptop supplies or similar in series would work just as well. The input voltages do not need to be accurate, just reasonably stable as the actual voltage is entered so 8.9V and 63V (for example could be used).
But if I want more or less reliable readings then I need a voltmeter which is trustful. The best I have is a Siglent SDM3045X 4,5 digit bench-multimeter. I have another question regarding the measurement of the RD6006's ripple you showed in another video. What kind of capacitor did you use to block the DC portion of the signal? It looks like a tantalum capacitor. Is the value of the capacitor important?
My power supply can only go up to 60 V, and my personal hobby projects never go above 24 V at maybe 0.5 A. Is there any downside to calibrating it for these ranges, or does the calibration have to take place at high voltage/amps? I also have the KP182, not the KP184. Is the calibration procedure exactly the same?
Does anyone know if this same procedure and voltage points are the same for the Kinkin 182?
sensei.... what do u think of kl5100 ,,, by kunkin
Where did you get your test leads? Have any recommendations?
I have used some with the lab-volt setup and they were super great.
0 to 2 Amps in steps of 1 nano Amp.
Wow!
Yes it is an impressive piece of equipment although I have to confess that I have not checked every step :) Having a max output of 110V also makes it useful for things that my bench supplies cannot manage.
Hi Jerry, what is the highest power you have tested this KP184 for. 400 watts seems to be high for this enclosure?
I tested all the way up to 400W and it was fine. There is quite a good heatsink and fan assembly inside. I only go to approx 350W in the video I posted when I was using it to test the RD6006 but I tested it at full power for 24 hours and it handled it very well. They are not as small as they look.
Hello Jerry,
Here is a helpful link to the stability problem of the Kunkin
www.eevblog.com/forum/testgear/fixing-an-manufacturer-issue-of-the-kunkin-kp184-electronic-load/
and
th-cam.com/video/NKwUACkCcFs/w-d-xo.html
Hans