ea-ps_2084-03b
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
ea-ps_2084-03b [2015/06/03 21:35] – experiments kingkevin | ea-ps_2084-03b [2024/01/07 17:49] (current) – external edit 127.0.0.1 | ||
---|---|---|---|
Line 22: | Line 22: | ||
* set voltage and current: in 0.1 V and 0.01 A steps | * set voltage and current: in 0.1 V and 0.01 A steps | ||
* wide voltage range (0-50 V): 0-84 V, 0-3 A (not a lot, but enough for electronics), | * wide voltage range (0-50 V): 0-84 V, 0-3 A (not a lot, but enough for electronics), | ||
- | * silent: | + | * silent: |
* have an earth connection: on the front panel | * have an earth connection: on the front panel | ||
* not expensive: ~ 80 € | * not expensive: ~ 80 € | ||
* not noname: Elektro-Automatik (never heard of it, but it's German and they have a decent website) | * not noname: Elektro-Automatik (never heard of it, but it's German and they have a decent website) | ||
* provide a communication interface: USB with proprietary documented protocol | * provide a communication interface: USB with proprietary documented protocol | ||
+ | |||
+ | {{: | ||
Here some more documents about this power supply: | Here some more documents about this power supply: | ||
Line 33: | Line 35: | ||
* [[http:// | * [[http:// | ||
* [[http:// | * [[http:// | ||
- | * [[http:// | + | * [[http:// |
====== measurement ====== | ====== measurement ====== | ||
Line 44: | Line 46: | ||
But doing that manually just takes to long. | But doing that manually just takes to long. | ||
So I decided to implement the protocol to control the the power supply, and I will measure the set output using a DMM connected to the computer. | So I decided to implement the protocol to control the the power supply, and I will measure the set output using a DMM connected to the computer. | ||
+ | |||
+ | {{: | ||
===== power supply ===== | ===== power supply ===== | ||
To control the power supply I implemented the protocol described in the {{: | To control the power supply I implemented the protocol described in the {{: | ||
- | The source code is available on [[https:// | + | The source code is available on [[https:// |
- | The [[https:// | + | The [[https:// |
It will set the voltage and current which are set, actual (measured by the power supply), and [[# | It will set the voltage and current which are set, actual (measured by the power supply), and [[# | ||
+ | Using [[https:// | ||
+ | These probably allow you to flash the firmware or calibrate the power supply. | ||
===== multimeter ===== | ===== multimeter ===== | ||
Line 60: | Line 66: | ||
==== connection ==== | ==== connection ==== | ||
+ | |||
+ | === UT-D02 === | ||
The DMM comes with an RS232 [[http:// | The DMM comes with an RS232 [[http:// | ||
Line 72: | Line 80: | ||
Finally I found a FT232-based RS232 to USB converter. | Finally I found a FT232-based RS232 to USB converter. | ||
This is an expensive cable (but good quality), from an evil company, and it worked. | This is an expensive cable (but good quality), from an evil company, and it worked. | ||
+ | |||
+ | Here is the schematic of this cable: | ||
+ | |||
+ | {{: | ||
But instead of using it, I decided to connect the cable to a CP2102-based UART to USB converter. | But instead of using it, I decided to connect the cable to a CP2102-based UART to USB converter. | ||
Line 78: | Line 90: | ||
* RS232 signals are inverted compared to UART. This was solved by inverting the signal using an NPN transistor and two resistors. | * RS232 signals are inverted compared to UART. This was solved by inverting the signal using an NPN transistor and two resistors. | ||
- | More details about the cable and modification is described in this picture: | + | ^ UT-D02 wire ^ CP2102 UART signal ^ PNP ^ |
+ | | green | GND | | | ||
+ | | yellow | GND | | | ||
+ | | orange | 5V | | | ||
+ | | | GND | E | | ||
+ | | | 5V + 10kΩ | C | | ||
+ | | brown + 10kΩ | | B | | ||
+ | | | RX | C | | ||
+ | |||
+ | {{:ea-ps_2084-03b: | ||
+ | |||
+ | === UT-D04 === | ||
For the second multimeter I used a [[http:// | For the second multimeter I used a [[http:// | ||
Line 137: | Line 160: | ||
Conclusion: don't trust the displayed voltage (it's too low), but you can be confident the output is right (except for the very low voltages and currents). | Conclusion: don't trust the displayed voltage (it's too low), but you can be confident the output is right (except for the very low voltages and currents). | ||
+ | |||
+ | ====== teardown ====== | ||
+ | |||
+ | Well laid out, good components, german quality ;) | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | ====== conclusion ====== | ||
+ | |||
+ | pro: | ||
+ | * fulfils all initial power supply criteria | ||
+ | * **set output is within accuracy** | ||
+ | * good design, lay out, quality components | ||
+ | * fast first contact response | ||
+ | |||
+ | contra: | ||
+ | * output is not switched of completely | ||
+ | * **measured value is up to 0.4 V lower than output voltage** | ||
+ | * second digit after . of voltage is always 0 and not settable (it should not be displayed in this case) | ||
+ | * second digit after . of voltage is always 0 and does not show measured value (the actual measured data is precise enough to show this digit) | ||
+ | * can skip fast knob turns | ||
+ | * USB cable does no fit in port because of the indent | ||
+ | * information in english programming manual missing | ||
+ | * small mistakes in programming manual | ||
+ | * can not be calibrated by end user, and vendor only calibrates if under warranty | ||
+ | * no contact support |
ea-ps_2084-03b.txt · Last modified: 2024/01/07 17:49 by 127.0.0.1