Differences

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--- ea-ps_2084-03b [2015/05/26 17:41] – created kingkevin
+++ ea-ps_2084-03b [2015/05/27 05:31] – [acquisition] kingkevin
@@ Line 13: / Line 13: @@
   * wide voltage range (0-50 V)
   * silent
-  * will an earth connection
+  * have an earth connection
   * not expensive
   * not noname
-  * most importantly: provide a communication interface
+  * provide a communication interface (most important)
 I found and bought a used power supply on eBay for ~ 80 €.
-And now I own an [[http://www.elektroautomatik.de/en/|Elektro-Automatik]] (EA) [[http://shop.elektroautomatik.de/shop/shop__POWER%20SUPPLY%200...84V0...3A100W__1::4::14::42::a39200116__en_GB;jsessionid=C2A626184771916CACA5FCD99944B2CB|PS 2084-03 B]] power supply.
+And now I own an [[http://www.elektroautomatik.de/en/|Elektro-Automatik]] EA-[[http://shop.elektroautomatik.de/shop/shop__POWER%20SUPPLY%200...84V0...3A100W__1::4::14::42::a39200116__en_GB;jsessionid=C2A626184771916CACA5FCD99944B2CB|PS 2084-03 B]] power supply. And this fulfilled are the requirements:
+  * 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), limited to 100 W
+  * silent: not fan, full passive cooling
+  * have an earth connection: on the front panel
+  * not expensive: ~ 80 €
+  * 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
+Here some more documents about this power supply:
+  * [[http://shop.elektroautomatik.de/shop/dos2/Web/Datenblaetter/datasheet_ps2000b.pdf|datasheet]] ({{:ea-ps_2084-03b:datasheet_ps2000b.pdf|archive}})
+  * [[http://shop.elektroautomatik.de/shop/dos2/Web/manuale/39200112.pdf|manual]] ({{:ea-ps_2084-03b:ps_2000_b.pdf|archive}})
+  * [[http://www.elektroautomatik.de/files/eautomatik/treiber/ps2000b/programming_ps2000b.zip|programming manual]] ({{:ea-ps_2084-03b:programming_ps2000b.zip|archive}})
+  * [[http://www.elektroautomatik.de/files/eautomatik/treiber/usb/usb_cdc_acm_driver.zip|driver]] (USB ACM for Windows)
+  * [[http://www.elektroautomatik.de/en/easyps2000-en.html|easyPS2000 software]] (Windows, demo version)
+====== measurement ======
+When powering the device on, I noticed that the voltage on the display did not change while I was turning on the knob.
+But the Digital Multi-Meter (DMM) actually shows that the voltage actually does change.
+Just the reading on the screen is inaccurate.
+It was time to measure how inaccurate this power supply is.
+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.
+===== power supply =====
+To control the power supply I implemented the protocol described in the {{:ea-ps_2084-03b:ps2000b_programming.pdf|programming manual}}.
+The source code is available on [[https://git.cuvoodoo.info/kingkevin/ea-ps_2084-03b/tree/master|git]].
+The [[https://git.cuvoodoo.info/kingkevin/ea-ps_2084-03b/blob/master/control.rb|control]] programming will increment the voltage from 0 to 84 V in 0.1 V steps, at 1.0 A.
+It will set the voltage and current which are set, actual (measured by the power supply), and [[#mutli-meter|measured]] (measured by the DMM)
+===== mutli-meter =====