Re: [time-nuts] Multiple Voltage monitoring
Hi Bill, I was going to suggest, depending upon Matts interests, that perhaps he could use a PIC or ATMEL device with analog inputs and roll his own. Most PIC models have 10 bits but some do have 12 bit. You could use an external A/D for 12 bits or more. I actually used this for a laboratory setup just recently, but I only needed about 1% of accuracy. I bought a Arduino Duemilanove board for *?25*. This includes a FDTI USB-to-serial and a Atmel AVR microcontroller and is powered from USB. Their simple IDE speaks a preprocessed version of C and it took me 5 minutes to have my 3-channel-analog-to-serial software done. You can also use your conventional toolchain and just ignore their beginners' environment, though. http://arduino.cc/en/Main/ArduinoBoardDuemilanove Chris ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Which end of the $$$ scale are you interested in? Are you willing to spend cash to save time, or do you prefer to invest time (hacking) to save $? DC, 0 to 6V, 10mV or better resolution. 10 mV out of 10 V is 10 bits. Your 6V requirement is a bit ugly. Be prepared to add an external divider. You can get 10 or 12 bit A/Ds on single chip micros. (Or could several years ago when I was last paying attention.) So I expect somebody in that business makes something that will solve your problem without breaking the bank. For example, Atmel's ATMega8a has 6 or 8 10 bit A/D channels. (6 on DIP, 8 on other packages.) The data sheet says 15 k samples per second, but that's the marketing number. I gave up before I found out how slow it is when you switch channels. It's unlikely to have troubles with 1 or 2 Hz. I expect Microchip/PIC has something similar. Atmel may have something better, I didn't look very hard. The Mega8 was just a sanity check. (I'm biased, I've used it before.) A/Ds (generally) fall into 2 categories. I'll call them fast and slow. The slow ones are linear in the number of counts rather than the number of bits, so they can be really slow when you get to 16-20 bits. Think of the refresh rate on a typical DVM. So you probably need to avoid those. (unless your 1-2 Hz is per single reading rather than getting a reading on each of the 4-8 inputs) The fast ones are linear in the number of bits. (Then there are the super-fast, flash converers that are just 1 cycle and maybe a few pipeline delays.) -- These are my opinions, not necessarily my employer's. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Hi Chris, That is an interesting item and the pricing is certainly on the inexpensive side. Sparkfun has it for $30. Sure beats trying to make your own boards and come up with the parts. I have an old development system from mikroElektronika [ http://www.mikroe.com/ ] for the PIC line. They provide compilers in C PASCAL or BASIC which resolve to machine routines, but to be honest even though I have the BASIC version, I never use it. I tend to like the machine language level even though I have not really warmed up to the PICs. At any rate, I spend some time explaining to those on the company's forum that the A/D is really more of a monitor then a real voltmeter. The reason I say that is you can never truly see zero volts, nor can you actually get to 5 volts at the other end without some fancy hardware tricks. The same goes for the ATMEL line. Most of the time your not looking for the zero end of the scale so everything works out ok. Thanks for the link to that product. It is certainly worthy of mention. BillWB6BNQ Christian Vogel wrote: Hi Bill, I was going to suggest, depending upon Matts interests, that perhaps he could use a PIC or ATMEL device with analog inputs and roll his own. Most PIC models have 10 bits but some do have 12 bit. You could use an external A/D for 12 bits or more. I actually used this for a laboratory setup just recently, but I only needed about 1% of accuracy. I bought a Arduino Duemilanove board for *?25*. This includes a FDTI USB-to-serial and a Atmel AVR microcontroller and is powered from USB. Their simple IDE speaks a preprocessed version of C and it took me 5 minutes to have my 3-channel-analog-to-serial software done. You can also use your conventional toolchain and just ignore their beginners' environment, though. http://arduino.cc/en/Main/ArduinoBoardDuemilanove Chris ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)
Hi Matt, A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10 channel multiplexer) and GPIB would fit your need withour emptying your wallet. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Let me quickly plug http://www.hw-group.com/products/sensors/Sens-UI_en.html I have found these guys to be cheap and good, when I had remote Temp monitoring needs. They have other cool stuff too. Worth a look. Xtof Matt Ettus wrote: DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1.Is the voltage AC or DC ? 2.What is the voltage range ? 3.What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Very nice! And at those prices, why bother to roll your own, unless you have some truly unique need. Thanks for the tip off. Dave Baxter. -Original Message- Message: 1 Date: Thu, 30 Jul 2009 22:17:24 -0700 From: Tom Van Baak t...@leapsecond.com Subject: Re: [time-nuts] Multiple Voltage monitoring To: Discussion of precise time and frequency measurement time-nuts@febo.com Message-ID: 4baeb8bffb0d4e628262e793ca20d...@pc52 Content-Type: text/plain; format=flowed; charset=Windows-1252; reply-type=original . . . Check out http://www.labjack.com /tvb ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Hello, Friday, July 31, 2009, 8:00:51, Matt Ettus wrote: M Does anyone have a good solution for monitoring 4-8 different voltages M at the same time? I only need a sample rate around 1-2 Hz, but would M need GPIB, serial, or ethernet support with protocol documentation. M Any help identifying a solution other than 8 voltmeters would be much M appreciated. There was already some suggestions about using microcontroller to build your own device, it looks reasonable for me but will take some time and effort. There is another possible solution (not well known here, and not so cheap, but may be useful if you need halvanic isolation and calibration handled by device). Look at Beckhoff K-Bus I/O devices or their Wago series 750 clones. You can build remote ADC with ethernet connection combining BK9000 bus coupler, some analog 0-10V input modules (there is choice of different resolutions, like KL3102 2-channel 16 bit modules, or KL3468 8-channel (single-ended) 0-10V 12-bit analog input modules). You will need one KL9010 bus end terminal. -- Best regards, Yuri mailto:y...@ostry.ru ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Multiple Voltage monitoring
Tektronix TM5003 or TM5006 power supply mainframe. DM5010, DM5110, or DM5120 meter. SI5020 input scanner. In place of the meters/scanner you could use the MI5010 multifunction interface with the 50M10 A/D card and a 50M40 or 50M41 relay scanner. Even better use an analog switch on the 50M70 development board or controlled by a 50M30 parallel I/O board. With a little shopping on Ebay you should be able to configure the system for around $300. Another possibility is a HP3457A meter with the relay card (or your own analog switch). All of these systems would measure the voltages sequentially, not simultaneously. I have seen some other HP meters with GPIB sell for under $50. You could just chain a bunch of them on the GPIB bus. _ Windows Live™ Hotmail®: Search, add, and share the web’s latest sports videos. Check it out. http://www.windowslive.com/Online/Hotmail/Campaign/QuickAdd?ocid=TXT_TAGLM_WL_QA_HM_sports_videos_072009cat=sports ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
I hardly ever respond to posts here, I am just too dumb but. I have looked into this a bit. Why not look at used Astro-med products on Ebay. This way you have the display and plotting built into your solution. You could probably pick up something for under $300 that would have 8 to 16 channels with plot. There are also 'Scopecorders' or Hi-corders' from Yokogawa and Hioki but it is really hard to find a decent one on Ebay or Dovebid and the prices are insane but the specifications sound impressive. -Patrick ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)
Marc Bury wrote: Hi Matt, A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10 channel multiplexer) and GPIB would fit your need withour emptying your wallet. I can vouch for the 3421A -- nice, inexpensive box that is low power and fairly painless to program. There are other HP data aquisition/switch boxes, including one with a 5 1/2 digit DMM, but they are much bigger and more power hungry. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
The $25 widget from Dataq. 4 channels, 10 bits, serial port http://www.dataq.com/products/startkit/di194rs.htm They have others. I've also used the Eval boards from Maxim or Nat Semi, but these day's they're usually USB. Sometimes, the protocol isn't published, but is trivially reverse engineerable from the demo program and a line monitor (inevitably, they talk USB, but emulate a COM port on the PC) OR they'll tell you the protocol if you ask. On 7/30/09 9:00 PM, Matt Ettus boysc...@gmail.com wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
I would add to this scenario the solution I've used for many years, the AD12 card shown at about mid page at: http://www.micromed.it/Elettronica/schede.html It is a 12 bit + sign, 8 single ended or 4 differential channels, AD converter with RS232 interface. Resolution is 1 mV, conversion time 8.8 microsec. The only issue is that you will have to write your programs yourself. Very low power consumption, good accuracy, it is still my preferred long-term measuring device, even for single channel measurements. I can make about 2000 measurements per seconds on a 300 MHz Centrino laptop running DOS. Easy to keep under UPS along with the laptop. I've not tested this, but I think it could be powered, skipping the onboard 5V regulator, from a USB or mouse port of the laptop. It has its own voltage reference onboard (doesn't rely on the 5V regulator). Antonio I8IOV ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Matt, Another RS232 DAQ that I've used often in the lab is model 232SDA12 from BB Electronics. See: http://www.bb-elec.com/product_family.asp?FamilyId=107TrailType=SubTrail=40 http://www.bb-elec.com/SubCategory.asp?SubCategoryId=40 /tvb ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)
Date: Thu, 30 Jul 2009 21:00:51 -0700 From: Matt Ettus boysc...@gmail.com Subject: [time-nuts] Multiple Voltage monitoring To: Discussion of precise time and frequency measurement Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt I recommend the Labjack model U12 USB DAQ unit. http://www.labjack.com/labjack_u12.php?prodId=27. It has eight 12-bit analog inputs with a +/- 10V range. The programming interface is through an open API (provided, with good documentation and support). Languages supported include Visual Basic, Power Basic, Visual C++, Delphi, Perl, Java, etc. A good number of programming examples are provided on the Labjack web site. An active forum is available as well. $129 USD plus SH. Lots of digital I/O as well, if you need it for other functions. Dave M masondg44 at comcast dot net ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)
Be careful on buying scanners. The issue is not the scanner but in the fact that they use plug in cards. Make sure you get the type of interface card(s) you need. There are a lot of HP/Agilent scanners out there minus all their cards. Saying that you can anything from a 3421A to a rack size scanners for less the $25. The 3421A's usually go for a bit more since they are small. If space and power is not an issue you can get a 3497A with its integral DMM (option 001) and a input MUX card (option 010) for at times less the $25 minus shipping. The last three I got were free minus the 120 mile round trip. On the flip side I got about 2,000 ft of double braided low noise Teflon insulated wire tossed in. The down size is they are big. The plus is you can get many different I/O cards and use it for other projects. -pete Marc Bury wrote: Hi Matt, A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10 channel multiplexer) and GPIB would fit your need withour emptying your wallet. I can vouch for the 3421A -- nice, inexpensive box that is low power and fairly painless to program. There are other HP data aquisition/switch boxes, including one with a 5 1/2 digit DMM, but they are much bigger and more power hungry. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
On Thu, Jul 30, 2009 at 10:17 PM, Tom Van Baakt...@leapsecond.com wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt Check out http://www.labjack.com /tvb Thanks to everyone for the great suggestions, and to Tom in particular for the LabJack suggestion. I hadn't heard of many of those companies. In the end, I decided to go with the LabJack UE9, which is inexpensive, flexible, and has an ethernet interface. LabJack seems to be very supportive of open source, their protocols are all open, and they even provide Linux, Mac, and Python drivers! Also interesting, check out: http://cloud.labjack.com This is their data acquisition server service... Very cool idea. Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Multiple Voltage monitoring
Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Hi Matt, 1.Is the voltage AC or DC ? 2.What is the voltage range ? 3.What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1. Is the voltage AC or DC ? 2. What is the voltage range ? 3. What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
National Instruments has been getting aggressive with their pricing lately: e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 . I was actually toying with the idea of getting into the DAQ business a few months ago, but I changed my mind in a hurry when I saw their ads. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Matt Ettus Sent: Thursday, July 30, 2009 9:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Multiple Voltage monitoring DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1. Is the voltage AC or DC ? 2. What is the voltage range ? 3. What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
I've actually got some of their ethernet devices. The problem is that the drivers are all closed. They give no info on how to talk to them without LabView. Matt On Thu, Jul 30, 2009 at 9:34 PM, John Milesjmi...@pop.net wrote: National Instruments has been getting aggressive with their pricing lately: e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 . I was actually toying with the idea of getting into the DAQ business a few months ago, but I changed my mind in a hurry when I saw their ads. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Matt Ettus Sent: Thursday, July 30, 2009 9:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Multiple Voltage monitoring DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1. Is the voltage AC or DC ? 2. What is the voltage range ? 3. What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
A good application for the Sanguino board? www.sanguino.cc -- FL DC, 0 to 6V, 10mV or better resolution. Thanks, Matt Trænger du til at se det store billede? Kelkoo giver dig gode tilbud på LCD TV! Se her http://dk.yahoo.com/r/pat/lcd ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Ah. Well, I guess that's the catch, then. :( Unless they actively encrypt the data, I'd guess that a few minutes with a variable power supply and a copy of Wireshark would open the proverbial kimono. Failing that, how about a bank of V-to-F converter chips with paralleled outputs, driving a line-in jack which is then FFT'ed to recover the 'channel' amplitudes? Cost would be a buck or two per input at most, plus a few hours' soldering and hacking time. (Or an Atmel chip with an RS-232 hookup, as F. Larsen's post suggested just before I hit 'send' on this one. That'd be the easy way out, I think.) -- john, KE5FX I've actually got some of their ethernet devices. The problem is that the drivers are all closed. They give no info on how to talk to them without LabView. Matt On Thu, Jul 30, 2009 at 9:34 PM, John Milesjmi...@pop.net wrote: National Instruments has been getting aggressive with their pricing lately: e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 . I was actually toying with the idea of getting into the DAQ business a few months ago, but I changed my mind in a hurry when I saw their ads. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Matt Ettus Sent: Thursday, July 30, 2009 9:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Multiple Voltage monitoring DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1. Is the voltage AC or DC ? 2. What is the voltage range ? 3. What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Hi John and Mat, The USB analog units seemed OK for the price ($169) and feature set. Another one to consider is http://www.dataq.com I tried one of their $25 starters that had 10 bit resolution. I was going to suggest, depending upon Matts interests, that perhaps he could use a PIC or ATMEL device with analog inputs and roll his own. Most PIC models have 10 bits but some do have 12 bit. You could use an external A/D for 12 bits or more. There are some decent low-end HP DVMs on ebay occasionally, if you want to take a chance on it working. That would be the cheapest way to get the GPIB. If time is short and you do not have the essentials for rolling you own then it looks like John's suggestion would be the more reasonable route. There are others that provide some low-end data acquisition products as well. You will have to do a Google search for data acquisition. Another idea is using some of the inexpensive 4 digit DVMs (run around $50 to $80) that have serial output capability. I bought a couple of Mastech units for $59 a few years ago. They had a temperature probe and the serial output. BillWB6BNQ John Miles wrote: National Instruments has been getting aggressive with their pricing lately: e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 . I was actually toying with the idea of getting into the DAQ business a few months ago, but I changed my mind in a hurry when I saw their ads. -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Matt Ettus Sent: Thursday, July 30, 2009 9:19 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Multiple Voltage monitoring DC, 0 to 6V, 10mV or better resolution. Thanks, Matt On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote: Hi Matt, 1.Is the voltage AC or DC ? 2.What is the voltage range ? 3.What kind of resolution ? BillWB6BNQ Matt Ettus wrote: Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Multiple Voltage monitoring
Does anyone have a good solution for monitoring 4-8 different voltages at the same time? I only need a sample rate around 1-2 Hz, but would need GPIB, serial, or ethernet support with protocol documentation. Any help identifying a solution other than 8 voltmeters would be much appreciated. Thanks, Matt Check out http://www.labjack.com /tvb ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
