Search found 50 matches

by Benkku
Tue Dec 13, 2011 2:32 am
Forum: General Syvecs Chat
Topic: PID tuning, any good reads?
Replies: 2
Views: 5994

Re: PID tuning, any good reads?

Sometimes starting values, are difficult to predict, hence trial and error method might be best during the field operations - especially in situations when actuator is not following command in a 'linear manner' - pneumatic positioning systems for example. Also there are quite few PID algorithms, beh...
by Benkku
Thu Dec 01, 2011 12:29 pm
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

:) War - nah... It's just opinions with reasoning why. Think for example that '60 mV' slope. In switch position 7 'worst case' difference is 420 mV at minimum (actually more than that ) when temp change is approximately 20-30 Deg C. ...Then when you have different forward voltage diodes connected in...
by Benkku
Thu Dec 01, 2011 2:47 am
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

and also worse, than when using foil resistors, despite of flowing current. :) Hence - one reason why all ADC binary and laddering circuits, are made with resistors.
by Benkku
Thu Dec 01, 2011 2:42 am
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

There was a good reason that I changed from resistor ladders to diodes.... I'll leave it to the reader to figure out why it was a step in the right direction :) What that 'good reason' might be? In my opinion - it is more difficult to measure circuit -in fault finding situations, when using diodes ...
by Benkku
Thu Dec 01, 2011 2:39 am
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

"Based on..." 0.1 mA - we can't assume current flowing through circuit to that low - when using diodes. Hence current flowing through circuit is greater than that, as diode does not limit forward flowing current to that low level. So - forward voltage slope is definitely greater than (60 m...
by Benkku
Tue Nov 29, 2011 10:10 pm
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

I don't agree that the temperature change is negligible. See the datasheet chart - change is 'easily' 0.2-0.3 volt over one diode at 30 degree temperature change - so when combined that with switch position 7 for example - total voltage change is also 7 times more (1.4 - 2.1 volts). In my opinion, d...
by Benkku
Fri Nov 25, 2011 4:17 am
Forum: General Syvecs Chat
Topic: Rotary switches for calibration changes, type question
Replies: 33
Views: 66416

Re: Rotary switches for calibration changes, type question

Althought the forward voltage drop in diodes is linear, but the change (slope) certainly is more as a function of temperature, than in metal foil resistors - also the forward voltage value differs between (same production batch) diodes. <clip> Foil resistor The primary resistance element of a foil r...
by Benkku
Thu Nov 24, 2011 1:22 am
Forum: S6 GP/PnP Technical
Topic: which igniter/amp
Replies: 3
Views: 7015

Re: which igniter/amp

Building DIY coil charging module is quite trivial, fex. you could use ISL9v3040 from Fairchild Semiconductor, which is 300mJ, 400V, N-Channel Ignition IGBT component. Capable of switching 17A current at 100 dec. C (21 A at 25 Dec. C). As what comes to casing, ones mileage may wary - cost effective ...
by Benkku
Sat May 28, 2011 9:43 am
Forum: Software
Topic: Bug in SCal.exe - folder selection
Replies: 0
Views: 9029

Bug in SCal.exe - folder selection

SCal 2.11.18 Fatal Application Exit *** Unhandled Exception! ExpCode: 0xC0000005 ExpFlags:0 ExpAddress: 0x7374616D <clip from expection file.txt> SoftwareVersion - 2.11.18 ExceptionCode - ACCESS VIOLATION ExceptionFlags - (00000000) ExceptionAddress - (77FCD887) NumberParameters - (2) ExceptionInfor...
by Benkku
Thu May 05, 2011 10:40 pm
Forum: Technical Deposit
Topic: Water / oil / fuel temp sensors
Replies: 8
Views: 38207

Re: Water / oil / fuel temp sensors

Bias resistor value is quite easy to determine, at least when bias resistor value is not changing - fex. some OEM GM systems bias resistor is swithced during temperature change. Sensor and bias resistor act as a voltage divider as per equation in earlier post. So the output voltage equals the bias v...