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--- ea-ps_2084-03b [2015/06/07 19:03] – add picture 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
   * 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
+  * silent: no fan, full passive cooling
   * have an earth connection: on the front panel
   * not expensive: ~ 80 €
@@ Line 35: / Line 35: @@
   * [[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)
+  * [[http://www.elektroautomatik.de/en/easyps2000.html|easyPS2000 software]] (Windows, demo version)
 ====== measurement ======
@@ Line 52: / Line 52: @@
 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 source code is available on [[https://git.cuvoodoo.info/kingkevin/ea-ps_2084-03b/|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.
+The [[https://git.cuvoodoo.info/kingkevin/ea-ps_2084-03b/src/branch/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 [[#mutlimeter|measured]] (measured by the DMM)
+Using [[https://git.cuvoodoo.info/kingkevin/ea-ps_2084-03b/src/branch/master/probe.rb|this script]] I could also find the following undocumented objects (for commands): 80, 81, 82, 83, 84, 85, 86, 87, 88, 149, 150, 151, 152, 156, 158, 160, 161, 162.
+These probably allow you to flash the firmware or calibrate the power supply.
 ===== multimeter =====
@@ Line 78: / Line 80: @@
 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.
+Here is the schematic of this cable:
+{{:ea-ps_2084-03b:ut-d02.svg?400|}}
 But instead of using it, I decided to connect the cable to a CP2102-based UART to USB converter.
@@ Line 157: / Line 163: @@
 ====== teardown ======
-Well lay out, good components, german quality ;)
+Well laid out, good components, german quality ;)
 {{:ea-ps_2084-03b:dsc02155-mini.jpg?175|}}
@@ Line 173: / Line 179: @@
 {{:ea-ps_2084-03b:dsc02162-mini.jpg?200|}}
+====== 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

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