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--- hardware:channels:meters:power:swissnox_s-watt [2012/01/28 14:43] – some cleanup stv0g
+++ hardware:channels:meters:power:swissnox_s-watt [2018/03/25 11:08] (aktuell) – alte Version wiederhergestellt (2013/02/10 13:15) jau
@@ Zeile 45: / Zeile 45: @@
 I verified this, by counting the 7755 pulses between the pulses of the normal S0 output. They are exactly the value 0x03 of the eeprom!
+Note that 410.000 imp/kWh are not set in stone. After modifying 16 S-Watts and recalibrating them using actual measurement rather than reading the EEPROM, I found that mine are now between 242 and 256 times faster than before (that would be between 484.000 and 512.000 imp/kWh). Every S-Watt will behave differently after the modification and every one needs to be calibrated.
+== Impulse Width ==
+The width (duration) of an impulse drops from 70-90ms to 0.5ms after the modification. Depending on what counter you use and how many S-Watts you like to keep track of, it could be easy to miss a few pulses, so it is important to keep this in mind.
+It is also likely that with currents greater than 13 amperes (roughly 3000 Watts), the impulse width might decrease even further. Assuming we have an S-Watt measuring 10.000 Watts (it is certified up to 50 amperes = 11.500 Watts) and it produces 500.000 imp/kWh, we'd have 500.000 impulses every 6 minutes, or (roughly) 100.000 imp/min, or ~1400 imp/s. It is unknown to me how the S-Watt would handle such high impulse frequencies.
 ==== ToDo ====
   * <del>Calibrate</del>