Yes its not bad is it. Does mean though, that to be of any use, you need a x1 non-inverting op-amp to prevent droop Tom Becker wrote: > It's the offset at nondimvolts=0; silly me, expecting 0 to yield 0. > Taking > that offset into account, the results are much better. > > Non Dim Volts output(0.1 mylar) > 0.0 0.207 -0.207= 0.000/4.401= 0.0 > 0.01 0.258 -0.207= 0.051/4.401= 0.0115 > 0.1 0.659 -0.207= 0.452/4.401= 0.103 > 0.2 1.088 -0.207= 0.881/4.401= 0.200 > 0.3 1.536 -0.207= 1.329/4.401= 0.302 > 0.4 1.966 -0.207= 1.759/4.401= 0.400 > 0.5 2.406 -0.207= 2.199/4.401= 0.500 > 0.6 2.849 -0.207= 2.642/4.401= 0.600 > 0.7 3.296 -0.207= 3.089/4.401= 0.702 > 0.8 3.739 -0.207= 3.532/4.401= 0.803 > 0.9 4.174 -0.207= 3.967/4.401= 0.901 > 1.0 4.608 -0.207= 4.401/4.401= 1.000 > > Superb. Thanks for the effort, Neil. > Tom Becker > --... ...-- > www.RighTime.com > The RighTime Clock Company, Inc., Cape Coral, Florida USA > +1239 540 5700 > > <http://www.ediets.com/start.cfm?code0510&media=zone" target="_blank" rel="nofollow">http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06554205:HM/A32163/R=0/SIGn0nglqg/*http://www.ediets.com/start.cfm?code0510&media=zone > > ">http://docs.yahoo.com/info/terms/>. |
|
Re: PutDAC - strange voltages
Started by ●October 14, 2003
Reply by ●October 21, 20032003-10-21
Reply by ●October 21, 20032003-10-21
> ... to be of any use, you need a x1 non-inverting op-amp... Yup, you can implement both the high-Z load and the offset with an opamp - with gain, too, if you like. Pumping it up to 0volts to 10volts with a 12V supply and a rail-to-rail opamp should be pretty easy. How have others interfaced this output? Netmedia: my apologies if I implied something errant. Do you guys know the source of the offset? Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 |
Reply by ●October 22, 20032003-10-22
Hi Tom. After I connected ground on the two boards the problem disappeared. My readings are now good: GRN - GRN : 0V 5V strip on dev board and: -GND on dev board: 4.98V -GND on s.board: 4.98V (obviously) Positive strip on the s.board and -GND on dev board: 6.06V -GND on s.board: 6.06V (obviously) -5V strip on dev board: 1.08V Directly connected to PIN13 and GRN: 0.00-0.10V Directly connected to PIN13 and GRN through a low pass filter: 0.20-1.0V (depending on the different nondimVolt values (The PutDAC is called once every 5 milliseconds)) Best regards Sebastian Probst Eide -----Original Message----- From: Tom Becker [mailto:] Sent: 21. oktober 2003 04:51 To: Subject: RE: [BasicX] PutDAC - strange voltages :( Before you worry about code and low-pass filters, you need to solve the hardware problems that you listed in a previous message: > Positive pole on the s.board and gnd on the dev board while the chip is in the dev board, I get: 0V (Should have been 6.06V as with the gnd on the s.board!) > +5 on the dev board and the gnd on the solderless board I get: 0.28V (should have been 4.98V!) > gnd on the dev board and the gnd on the s.board I get: -0.38V! (should have been 0.0V!!) Until these are what they should and must be, you should defer more complex notions. Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co de0510&media=zone> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A32163/rand75382935> ">http://docs.yahoo.com/info/terms/> Yahoo! Terms of Service. |
|
Reply by ●October 22, 20032003-10-22
Do not misunderstand me. My readings are NOT good, just that the hardware problem isn't much of a problem any more! That single problem is gone. The strange voltages from the chip are still the same! Best regards Sebastian Probst Eide Web: <http://dagensstart.com/> Dagensstart.com Email: <mailto:> Phone: +47 9797 0000 -----Original Message----- From: Sebastian P. E. [mailto:] Sent: 22. oktober 2003 07:20 To: Subject: RE: [BasicX] PutDAC - strange voltages :( Hi Tom. After I connected ground on the two boards the problem disappeared. My readings are now good: GRN - GRN : 0V 5V strip on dev board and: -GND on dev board: 4.98V -GND on s.board: 4.98V (obviously) Positive strip on the s.board and -GND on dev board: 6.06V -GND on s.board: 6.06V (obviously) -5V strip on dev board: 1.08V Directly connected to PIN13 and GRN: 0.00-0.10V Directly connected to PIN13 and GRN through a low pass filter: 0.20-1.0V (depending on the different nondimVolt values (The PutDAC is called once every 5 milliseconds)) Best regards Sebastian Probst Eide -----Original Message----- From: Tom Becker [mailto:] Sent: 21. oktober 2003 04:51 To: Subject: RE: [BasicX] PutDAC - strange voltages :( Before you worry about code and low-pass filters, you need to solve the hardware problems that you listed in a previous message: > Positive pole on the s.board and gnd on the dev board while the chip is in the dev board, I get: 0V (Should have been 6.06V as with the gnd on the s.board!) > +5 on the dev board and the gnd on the solderless board I get: 0.28V (should have been 4.98V!) > gnd on the dev board and the gnd on the s.board I get: -0.38V! (should have been 0.0V!!) Until these are what they should and must be, you should defer more complex notions. Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co de0510&media=zone> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A32163/rand75382935> ">http://docs.yahoo.com/info/terms/> Yahoo! Terms of Service. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A06996/randb8306793> ">http://docs.yahoo.com/info/terms/> Service. |
|
Reply by ●October 22, 20032003-10-22
Neil, I tried connecting the two grounds a week ago as I received your post, and the results posted earlier this day where from that test, but the voltages where still wrong so I didn't see any reason posting them till Tom asked me if I actually had tried your advice. 1. I have never been connecting anything else to the pin except the resistor (I have both tried a 1k (998ohm) and a 10k (9880ohm). I got shitty results with the 10k resistor) and the capacitor (I have been connecting my voltmeter though). I haven't even been using any of the other pins at the same time. 2. The capacitors I have been using at my latest test have all been in the range between 0.01 and 0.1uF. I have tried connecting them back to front as well but they always deliver the same result. Is there a way to determine whether a cap is electrolytic or not? I just grabbed some parts from a box at my school and there is no documentation at all and the inscriptions do not tell me much except the capacity. (On one: 0.1 | 63- A | S 2 | WIMA, on the other type: 0.01 | 100-A | WIMA | T21). I haven't been able to find capacitors in any electronics store here in Norway so far, believe me, I have tried several. and if the ones I have got aren't electrolytic should work fine, shouldn't they? That is if they're not really old which I hope they're not. 3. I have got a brand new digital multimeter. It is called CM2701 and was made by Caltek instruments. I have been using it set to measure DC volts. 4. I tried refreshing the pin every 1 milliseconds and every 0.1 milliseconds but the results stayed the same. 5. I tried pin 13, 14 and 15, all with the same results. Now I get a voltage at up to 2.73V though! Hip hurray! Not quite 5V though. Best regards Sebastian Probst Eide -----Original Message----- From: Neil Jepsen [mailto:] Sent: 21. oktober 2003 08:24 To: Subject: Re: [BasicX] PutDAC - strange voltages :( Sebastian...I told you about connecting the grounds together a week ago!! I would do the following: 1. Disconnect EVERYTHING from the pin you are testing, EXCEPT the resistor and the capacitor. 2. The capacitor must be a non electrolytic and between 0.01 and 0.47 uF. The reason I say this is an electrolytic can be connected back to front, or or might be leaky. If you use a mylar or similar, it can't be connected wrongly. 3. You must use a digital voltmeter. Grand-dad's old analogue VOM probably has a low input impedance. What meter are you using? Make sure the meter is set to DC volts. 4. Refresh the pin as fast as you can 5. If this doesn't work, try one of the other output pins. You may have damaged a pin. 5. Tell us what you get when you've done ALL of this. neil Sebastian P. E. wrote: > Do not misunderstand me. My readings are NOT good, just that the > hardware problem isn't much of a problem any more! That single problem > is gone. The strange voltages from the chip are still the same! > > Best regards > Sebastian Probst Eide > Web: <http://dagensstart.com/> Dagensstart.com > Email: <mailto:> > Phone: +47 9797 0000 > > -----Original Message----- > From: Sebastian P. E. [mailto:] > Sent: 22. oktober 2003 07:20 > To: > Subject: RE: [BasicX] PutDAC - strange voltages :( > > Hi Tom. > After I connected ground on the two boards the problem disappeared. > My readings are now good: > > GRN - GRN : 0V > 5V strip on dev board and: > -GND on dev board: 4.98V > -GND on s.board: 4.98V (obviously) > Positive strip on the s.board and > -GND on dev board: 6.06V > -GND on s.board: 6.06V (obviously) > -5V strip on dev board: 1.08V > Directly connected to PIN13 and GRN: 0.00-0.10V > Directly connected to PIN13 and GRN through a low pass filter: 0.20-1.0V > (depending on the different nondimVolt values (The PutDAC is called once > every 5 milliseconds)) > > Best regards > Sebastian Probst Eide > -----Original Message----- > From: Tom Becker [mailto:] > Sent: 21. oktober 2003 04:51 > To: > Subject: RE: [BasicX] PutDAC - strange voltages :( > > Before you worry about code and low-pass filters, you need to solve the > hardware problems that you listed in a previous message: > > > Positive pole on the s.board and gnd on the dev board while the chip > is in the dev board, I get: 0V (Should have been 6.06V as with the gnd > on the s.board!) > > +5 on the dev board and the gnd on the solderless board I get: 0.28V > (should have been 4.98V!) > > gnd on the dev board and the gnd on the s.board I get: -0.38V! (should > have been 0.0V!!) > > Until these are what they should and must be, you should defer more > complex notions. > Tom Becker > --... ...-- > www.RighTime.com > The RighTime Clock Company, Inc., Cape Coral, Florida USA > +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co > de0510&media=zone> click here > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > pmail/S=:HM/A32163/rand75382935> > > ">http://docs.yahoo.com/info/terms/> Yahoo! Terms of Service. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co > de0509&media=atkins> click here > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > pmail/S=:HM/A06996/randb8306793> > > ">http://docs.yahoo.com/info/terms/> Service. > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http://www.ediets.com/start.cfm?c ode0509 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> &media=atkins> > ">http://docs.yahoo.com/info/terms/>. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co de0510&media=zone> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A32163/rand67302747> ">http://docs.yahoo.com/info/terms/> Service. |
|
Reply by ●October 22, 20032003-10-22
I hope not... :-( Is there a way to test the chip for things like that? Best regards Sebastian Probst Eide -----Original Message----- From: Tom Becker [mailto:] Sent: 21. oktober 2003 08:53 To: Subject: RE: [BasicX] PutDAC - strange voltages :( > ... You may have damaged a pin... Or worse. With no common ground, current will find another way to get back to the supply - perhaps via a destructive internal path. Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A54016/R=0/SIGpv1u2ju/*http:/www.ediets.com/start.cfm?co de0529&media=atkins> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A54016/rand6518875> ">http://docs.yahoo.com/info/terms/> Service. |
Reply by ●October 23, 20032003-10-23
Hi guys! I just tried a slightly modified version of the program Neil used and all of a sudden I got great results... The circuit I used was the same as with my earlier tests. I really don't get why it didn't work till now! It might have been because I didn't refresh it fast enough, but wouldn't you think once every millisecond should do? Now I am getting NondimVolt Voltage 0.5 2.36V 1.0 4.60V Thanks to all of you for helping me! Best regards Sebastian Probst Eide -----Original Message----- From: Neil Jepsen [mailto:] Sent: 21. oktober 2003 22:02 To: Subject: Re: [BasicX] PutDAC - strange voltages :( Sebastian Whenever you are using more than one power supply, in most cases ( nost not all) you must connect the grounds together. I can't think of an instance except perhaps where you are using opto isolators, where this would not be the case. Your WIMA 0.1 is OK, but I'm surprised that the 10k didn't work,. this points to your DVM being low impedance. I just hooked up a BX24 as follows: Pin 12 had a 10k in series with a 0.1 to ground. I used a Fluke DVM Program was : '****************************** public sub main() dim daccounter as byte do call putdac(12,0.5,daccounter) loop end sub '******************************* The values I got were:- nondimvolt: measured value: 0.25 1.3 volts 0.5 2.4v 0.75 3.5v 1.0 4.6v Sebastian P. E. wrote: Neil, I tried connecting the two grounds a week ago as I received your post, and the results posted earlier this day where from that test, but the voltages where still wrong so I didn't see any reason posting them till Tom asked me if I actually had tried your advice. 1. I have never been connecting anything else to the pin except the resistor (I have both tried a 1k (998ohm) and a 10k (9880ohm). I got shitty results with the 10k resistor) and the capacitor (I have been connecting my voltmeter though). I haven't even been using any of the other pins at the same time. 2. The capacitors I have been using at my latest test have all been in the range between 0.01 and 0.1uF. I have tried connecting them back to front as well but they always deliver the same result. Is there a way to determine whether a cap is electrolytic or not? I just grabbed some parts from a box at my school and there is no documentation at all and the inscriptions do not tell me much except the capacity. (On one: 0.1 | 63- A | S 2 | WIMA, on the other type: 0.01 | 100-A | WIMA | T21). I haven't been able to find capacitors in any electronics store here in Norway so far, believe me, I have tried several. and if the ones I have got aren't electrolytic should work fine, shouldn't they? That is if they're not really old which I hope they're not. 3. I have got a brand new digital multimeter. It is called CM2701 and was made by Caltek instruments. I have been using it set to measure DC volts. 4. I tried refreshing the pin every 1 milliseconds and every 0.1 milliseconds but the results stayed the same. 5. I tried pin 13, 14 and 15, all with the same results. Now I get a voltage at up to 2.73V though! Hip hurray! Not quite 5V though. Best regards Sebastian Probst Eide -----Original Message----- From: Neil Jepsen [mailto:] Sent: 21. oktober 2003 08:24 To: Subject: Re: [BasicX] PutDAC - strange voltages :( Sebastian...I told you about connecting the grounds together a week ago!! I would do the following: 1. Disconnect EVERYTHING from the pin you are testing, EXCEPT the resistor and the capacitor. 2. The capacitor must be a non electrolytic and between 0.01 and 0.47 uF. The reason I say this is an electrolytic can be connected back to front, or or might be leaky. If you use a mylar or similar, it can't be connected wrongly. 3. You must use a digital voltmeter. Grand-dad's old analogue VOM probably has a low input impedance. What meter are you using? Make sure the meter is set to DC volts. 4. Refresh the pin as fast as you can 5. If this doesn't work, try one of the other output pins. You may have damaged a pin. 5. Tell us what you get when you've done ALL of this. neil Sebastian P. E. wrote: > Do not misunderstand me. My readings are NOT good, just that the > hardware problem isn't much of a problem any more! That single problem > is gone. The strange voltages from the chip are still the same! > > Best regards > Sebastian Probst Eide > Web: <http://dagensstart.com/> Dagensstart.com > Email: <mailto:> > Phone: +47 9797 0000 > > -----Original Message----- > From: Sebastian P. E. [mailto:] > Sent: 22. oktober 2003 07:20 > To: > Subject: RE: [BasicX] PutDAC - strange voltages :( > > Hi Tom. > After I connected ground on the two boards the problem disappeared. > My readings are now good: > > GRN - GRN : 0V > 5V strip on dev board and: > -GND on dev board: 4.98V > -GND on s.board: 4.98V (obviously) > Positive strip on the s.board and > -GND on dev board: 6.06V > -GND on s.board: 6.06V (obviously) > -5V strip on dev board: 1.08V > Directly connected to PIN13 and GRN: 0.00-0.10V > Directly connected to PIN13 and GRN through a low pass filter: 0.20-1.0V > (depending on the different nondimVolt values (The PutDAC is called once > every 5 milliseconds)) > > Best regards > Sebastian Probst Eide > -----Original Message----- > From: Tom Becker [mailto:] > Sent: 21. oktober 2003 04:51 > To: > Subject: RE: [BasicX] PutDAC - strange voltages :( > > Before you worry about code and low-pass filters, you need to solve the > hardware problems that you listed in a previous message: > > > Positive pole on the s.board and gnd on the dev board while the chip > is in the dev board, I get: 0V (Should have been 6.06V as with the gnd > on the s.board!) > > +5 on the dev board and the gnd on the solderless board I get: 0.28V > (should have been 4.98V!) > > gnd on the dev board and the gnd on the s.board I get: -0.38V! (should > have been 0.0V!!) > > Until these are what they should and must be, you should defer more > complex notions. > Tom Becker > --... ...-- > www.RighTime.com > The RighTime Clock Company, Inc., Cape Coral, Florida USA > +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co > de0510&media=zone> click here > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > pmail/S=:HM/A32163/rand75382935> > > ">http://docs.yahoo.com/info/terms/> Yahoo! Terms of Service. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co > de0509&media=atkins> click here > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > pmail/S=:HM/A06996/randb8306793> > > ">http://docs.yahoo.com/info/terms/> Service. > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http://www.ediets.com/start.cfm?c ode0509 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> &media=atkins> > ">http://docs.yahoo.com/info/terms/>. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co de0510&media=zone> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A32163/rand67302747> ">http://docs.yahoo.com/info/terms/> Service. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32161/R=0/SIGp5b9ris/*http://www.ediets.com/start.cfm?c ode0509 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32161/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> &media=atkins Your use Sebastian P. E. wrote: > Neil, I tried connecting the two grounds a week ago as I received your > post, and the results posted earlier this day where from that test, but > the voltages where still wrong so I didn't see any reason posting them > till Tom asked me if I actually had tried your advice. > > 1. I have never been connecting anything else to the pin except the > resistor (I have both tried a 1k (998ohm) and a 10k (9880ohm). I got > shitty results with the 10k resistor) and the capacitor (I have been > connecting my voltmeter though). I haven't even been using any of the > other pins at the same time. > 2. The capacitors I have been using at my latest test have all been > in the range between 0.01 and 0.1uF. I have tried connecting them back > to front as well but they always deliver the same result. Is there a > way to determine whether a cap is electrolytic or not? I just grabbed > some parts from a box at my school and there is no documentation at all > and the inscriptions do not tell me much except the capacity. (On one: > 0.1 | 63- A | S 2 | WIMA, on the other type: 0.01 | 100-A | WIMA | T21). > I haven't been able to find capacitors in any electronics store here in > Norway so far, believe me, I have tried several. and if the ones I have > got aren't electrolytic should work fine, shouldn't they? That is if > they're not really old which I hope they're not. > 3. I have got a brand new digital multimeter. It is called CM2701 > and was made by Caltek instruments. I have been using it set to measure > DC volts. > 4. I tried refreshing the pin every 1 milliseconds and every 0.1 > milliseconds but the results stayed the same. > 5. I tried pin 13, 14 and 15, all with the same results. Now I get > a voltage at up to 2.73V though! Hip hurray! Not quite 5V though. > > Best regards > Sebastian Probst Eide > -----Original Message----- > From: Neil Jepsen [mailto:] > Sent: 21. oktober 2003 08:24 > To: > Subject: Re: [BasicX] PutDAC - strange voltages :( > > Sebastian...I told you about connecting the grounds together a week > ago!! > > I would do the following: > 1. Disconnect EVERYTHING from the pin you are testing, EXCEPT the > resistor and the capacitor. > 2. The capacitor must be a non electrolytic and between 0.01 and 0.47 > uF. The reason I say this is an electrolytic can be connected back to > front, or or might be leaky. If you use a mylar or similar, it can't be > connected wrongly. > 3. You must use a digital voltmeter. Grand-dad's old analogue VOM > probably has a low input impedance. What meter are you using? Make > sure the meter is set to DC volts. > 4. Refresh the pin as fast as you can > 5. If this doesn't work, try one of the other output pins. You may have > > damaged a pin. > 5. Tell us what you get when you've done ALL of this. > neil > > > Sebastian P. E. wrote: > > > Do not misunderstand me. My readings are NOT good, just that the > > hardware problem isn't much of a problem any more! That single > problem > > is gone. The strange voltages from the chip are still the same! > > > > Best regards > > Sebastian Probst Eide > > Web: <http://dagensstart.com/> Dagensstart.com > > Email: <mailto:> > > Phone: +47 9797 0000 > > > > -----Original Message----- > > From: Sebastian P. E. [mailto:] > > Sent: 22. oktober 2003 07:20 > > To: > > Subject: RE: [BasicX] PutDAC - strange voltages :( > > > > Hi Tom. > > After I connected ground on the two boards the problem disappeared. > > My readings are now good: > > > > GRN - GRN : 0V > > 5V strip on dev board and: > > -GND on dev board: 4.98V > > -GND on s.board: 4.98V (obviously) > > Positive strip on the s.board and > > -GND on dev board: 6.06V > > -GND on s.board: 6.06V (obviously) > > -5V strip on dev board: 1.08V > > Directly connected to PIN13 and GRN: 0.00-0.10V > > Directly connected to PIN13 and GRN through a low pass filter: > 0.20-1.0V > > (depending on the different nondimVolt values (The PutDAC is called > once > > every 5 milliseconds)) > > > > > > > > Best regards > > Sebastian Probst Eide > > > > > > -----Original Message----- > > From: Tom Becker [mailto:] > > Sent: 21. oktober 2003 04:51 > > To: > > Subject: RE: [BasicX] PutDAC - strange voltages :( > > > > Before you worry about code and low-pass filters, you need to solve > the > > hardware problems that you listed in a previous message: > > > > > Positive pole on the s.board and gnd on the dev board while the chip > > is in the dev board, I get: 0V (Should have been 6.06V as with the gnd > > on the s.board!) > > > +5 on the dev board and the gnd on the solderless board I get: 0.28V > > (should have been 4.98V!) > > > gnd on the dev board and the gnd on the s.board I get: -0.38V! > (should > > have been 0.0V!!) > > > > Until these are what they should and must be, you should defer more > > complex notions. > > > > > > Tom Becker > > --... ...-- > > www.RighTime.com > > The RighTime Clock Company, Inc., Cape Coral, Florida USA > > +1239 540 5700 > > > > > > > > > > > > > > > > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > > > 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co > > de0510&media=zone> click here > > > > > > > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > > pmail/S=:HM/A32163/rand75382935> > > > > ">http://docs.yahoo.com/info/terms/> Yahoo! Terms of Service. > > > > > > > > > > > > > > > > > > > > > > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > > > 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co > > de0509&media=atkins> click here > > > > > > > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > > pmail/S=:HM/A06996/randb8306793> > > > > ">http://docs.yahoo.com/info/terms/> Service. > > > > > > > > > > > > > > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A06996/R=0/SIGp5b9ris/*http://www.ediets.com/start.cfm?c > ode0509 > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co > de0509&media=atkins> &media=atkins> > > > > > > > > ">http://docs.yahoo.com/info/terms/>. > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 > 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co > de0510&media=zone> click here > <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou > pmail/S=:HM/A32163/rand67302747> > > ">http://docs.yahoo.com/info/terms/> Service. > > <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32161/R=0/SIGp5b9ris/*http://www.ediets.com/start.cfm?c ode0509 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32161/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> &media=atkins> > ">http://docs.yahoo.com/info/terms/>. <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A06996/R=0/SIGp5b9ris/*http:/www.ediets.com/start.cfm?co de0509&media=atkins> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A06996/rand)2949662> ">http://docs.yahoo.com/info/terms/> Service. |
|
Reply by ●October 23, 20032003-10-23
> Now I am getting > NondimVolt Voltage > 0.5 2.36V > 1.0 4.60V Glad to hear it, Sebastian. It's hard to believe that you'd need to refresh at 1KHz, but at least you're on your way. What do you see for nondimvolt= 0? Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 |
|
Reply by ●October 23, 20032003-10-23
Hi Tom Here is a nondimVolt - voltage table: NondimV Voltage 0.0 0.17 0.2 1.03 0.4 1.90 0.6 2.78 0.8 3.68 1.0 4.60 Ah. :-) This really made my day! Best regards Sebastian Probst Eide -----Original Message----- From: Tom Becker [mailto:] Sent: 23. oktober 2003 18:32 To: Subject: RE: [BasicX] PutDAC - strange voltages :( > Now I am getting > NondimVolt Voltage > 0.5 2.36V > 1.0 4.60V Glad to hear it, Sebastian. It's hard to believe that you'd need to refresh at 1KHz, but at least you're on your way. What do you see for nondimvolt= 0? Tom Becker --... ...-- www.RighTime.com The RighTime Clock Company, Inc., Cape Coral, Florida USA +1239 540 5700 <http://rd.yahoo.com/M4081.4074964.5287182.1261774/D=egroupweb/S06 554205:HM/A32163/R=0/SIGn0nglqg/*http:/www.ediets.com/start.cfm?co de0510&media=zone> click here <http://us.adserver.yahoo.com/l?M4081.4074964.5287182.1261774/D=egrou pmail/S=:HM/A32163/randW1825989> ">http://docs.yahoo.com/info/terms/> Service. |
|
Reply by ●October 25, 20032003-10-25