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Old 11-14-2009, 08:29 AM
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TEST #9 - New Shunt & Re-test of TEST #8

Hi Everyone,

Here is Test #9 with the new shunt a 0.25 Ohm resistor from "Caddock" High Performance Film Resistor, "non-inductive" 30 Watt, type MP930-0.25-1%, this is a re-test of TEST #8

*The TDS 3054C oscilloscope probes are a type Tektronix P6139A with the standard 6" grounding leads.

************************************************** *******

Channel 1 - Mosfet source shunt
Channel 2 - Mosfet drain
Channel 3 - 555 Timer pin #3
Channel 4 - 24 VDC "Liquid" Lead Acid Battery Bank


( 555 Image Readings Taken Prior to 24 Volt Battery Connection )


40us_11-13-09.png Image
40us_11-13-09.CSV Spread Sheet File


20us_11-13-09.png Image
20us_11-13-09.CSV Spread Sheet File


2us_11-13-09.png Image
2us_11-13-09.CSV Spread Sheet File


1us_11-13-09.png Image
1us_11-13-09.CSV Spread Sheet File


100ns_11-13-09.png Image
100ns_11-13-09.CSV Spread Sheet File

************************************************** *******
This is a test using only two oscilloscope probes with one probe tip on Channel-1 between the Mosfet and Shunt and Channel-2 between the Shunt and the Battery Negative (B-) terminal.

Both probe grounds Channel-1 and Channel-2 connected to a separate isolated AC ground point "NOT" to the battery negative (B-) terminal

Channel 1 - Mosfet Source to Shunt
Channel 2 - Shunt to Battery Negative
Channel 3 - 555 Timer Pin #3
(no probe connection - reference only)


MOSFET_SHUNT_BAT_N_555_11-13-09.png Image
MOSFET_SHUNT_BAT-N_555_11-13-09.CSV Spread Sheet File

All Images and data by a Tektronix TDS 3054C from the Tektronix Corporation


Last edited by FuzzyTomCat; 11-14-2009 at 07:24 PM. Reason: added 555 timer snapshot info - 100ns mismark - added scope probe info