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--- computemodul4_temperature_test [2021/05/03 00:50]
wf68spef
+++ computemodul4_temperature_test [2021/05/17 00:59]
wf68spef
@@ Line 16: / Line 16: @@
   * PI4 Internal CPU Thermometer
   * Multimeter: AM-550-EU PTC Temperature for Wifi Temperature Measurements
+      * The temperature of the wifi module by placing the ptc at the heatsink of the wifi module
+      * Not highly accurate, but should give a indication
+Lab Power source
+  * Quatpower LN-3003
 ====== Software ======
-==== Reduced power usage by disabling various CM4 modules ====
+==== Reduce power usage of CM4 ====
 **no bluetooth**
@@ Line 49: / Line 53: @@
   * config.txt
   * dtparam=audio=off
+**no USB**
+  * disabled by default @ CM4 for powersaving
+  * https://www.jeffgeerling.com/blog/2020/usb-20-ports-not-working-on-compute-module-4-check-your-overlays
 ==== Testsoftware ====
@@ Line 121: / Line 129: @@
 Using the power usage in Wh a **mean power of ~3.38W** is needed when using 2 cameras + wifibroadcast.
+==== Test 3 - Wifi ====
+As it turned out that the radio power amplifier was not connected in test #2, i reran the test. Power is provided by the laboratory power source @ 12.3V + DCDC Converter @ 5V for the cm4 board. NOTE: The sligtly incread Idle power usage is due to the additional DCDC converter, and the powermeasurement BEFORE this converter.
+^ Testmode      ^ Time (h) ^  Power usage (W) ^ CPU Temp (°C) ^ WIFI Temp (°C) ^
+| IDLE |  0:00    | 2.3      |  34.5          |  27           |
+| WIFI |  0:01    | 5.78      |  36.5          |  29           |
+| WIFI |  0:11    | 5.78           |  46.7           |   58           |
+| WIFI |  0:21    | 5.78           |  51.0           |   62           |
+| WIFI |  0:30    | 5.78           |  51.0           |   63           |