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--- ea-ps_2084-03b [2015/05/26 18:06] – add documents kingkevin
+++ ea-ps_2084-03b [2015/05/26 18:36] – measurement part 1 kingkevin
@@ Line 34: / Line 34: @@
   * [[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, [[http://www.elektroautomatik.de/en/easyps2000-en.html|demo only]])
+====== 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 =====