Trying to measure voltage through 1 wire connection
Hai ,
I am trying to measure voltage through 1 wire connection using NI hardwares like 1)chasis SCXI-1000 2) DMM PCI- 4060, 3) MUX SCXI-1127 and 4) Terminal Block SCXI-1331. Please see a attached picture of my set up.
I am unable to establish my connection through 1_WIRE_LO_REF .I want to use it as my reference point (GND) through which I can measure the voltage .I think there may be problem in my design or in the labview code.Could u please verify and suggest the appropriate one.
Can I use 1_wire_Lo_ref is so which port to be used, actually i have six ports for this point (or) is there any altenative
I hope u respond soon and in the affirmative
with regards
madhava
Attachments:
Scanning_of_SCXI-1127_48_write.vi 144 KB
IM0000041[1].jpg 722 KB
IM0000041[1]1.jpg 722 KB
Hi Madhava,
Are you unable to get the example program to work? Are you using an Aux cable to connect the switch to the DMM or are you triggering from the connector block of the switch?
One good resource is to open the NI-Switches Help from Start >> Programs >> National Instruments >> NI-Switch >> Documentation >> NI-Switches Help. Go to the Search tab and search for Single Module Scanning - Handshaking. There are sections for SCXI or PXI depending on which form factor you are using. This will explain which triggers to use and how to connect the DMM and Switch together.
In the same help file, if you search for Scan Lists, this will show you the proper syntax for the scan lists. The scan list can all be listed in one text box and does not have to be an array of strings.
I think the best way to proceed is to take the example that I showed you save it as a new program so you can go back to the original if you need, make it work and then modify it to do what you need. Add the write to file for example. If you have any questions about specific issues, I can help you with those.
Thank You,
Nick F.
Applications Engineer
Similar Messages
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Trying to measure voltage through SCXI-1127/1331 1-wire connection
We have NI hardwares like: 1) Chasis SCXI-1000, 2) DMM PCI- 4060, 3) MUX SCXI-1127 and 4) Terminal Block SCXI-1331
We have a system with two large glass plates standing vertically and placed parallel to each other each having 24 electrodes on them. Distance between them is 4-5 inches. The plates are places in such a way that the electrodes are on the outer side and accessible to the user. We are trying to flow different liquids of different density through the channel in between. Please find attached a picture of it.
So a total of 48 electrodes and hence, wires are connected, 24 on both sides. On each side there are 3 rows with 8 electrodes/row, making a total of 24 wires. Wire#1-24 are on side A (say) and wire# 25-48 are on side B (the other side). The medium between the two sides will be salted water (say for now).
We want to measure potential/voltage in such a manner so that we can calculate the voltage difference between all possible electrode combinations between side A and side B. Like V1-25, V1-26, V1-27,...,V1-48,V2-25,V2-26,........,V24-48, all 24 X 24 possible combinations. We are connecting two end of a power source to side A and side B so that there is some current flowing in the water.
I have connected wire# 1-48 to 1-48 in SCXI 1331 (left out the zero to avoid confusion). Now that I'm measuring values through the program attached ("Scanning_....vi"), I can see that the first 16 values are showing some values of standards E-2. But from 17-48 are showing values of standard 5E-3 and I guess they are not taking any values at all. Can you tell me why this might be happenning?
Can 1-wire measurement be applied for this scenario. If not then let me know how to achieve our goal. I can manually take a Multimeter and measure all the combinations one by one, but measuring all the values at the same instance would be better and that only can be done by automation and I hope that the NI hardwares I have, should be sufficient to do that. Please let me know if it is otherwise.
Another thing, in one of my previous contact with NI someone mentioned connecting 1_WIRE_LO_REF. Is it needed in this case? If yes, then if I connect one end to 1_WIRE_LO_REF, where should I put the other end?
In case the program is wrong or more than 16 values can not be taken please let me know alternate path or show me how to make changes in the program. I would appreciate your help in this issue. Thank you.
Message Edited by ERT_LSU on 09-17-2007 12:16 PM
Attachments:
Scanning_of_SCXI-1127_48_write.vi 144 KB
IM0000021.jpg 767 KB
IM0000041.jpg 722 KBI connected the COM of my power source to the 1_WIRE_LO_REF. There are 4-5 points to connect. I choose the middle slot. Is there any significance of assigning so many slots to 1_WIRE_LO_REF?
No change in result. Can you please test run the program I attached and see whether it's correct or not. You'll see 48 segments getting the output. First 16 of them are showing some seemingly proper values. rset are either too small or as big as 5 V.
I'm providing 5Vs from the power source. You might have seen the old analog ones. I'm using one of them. there are different Voltgae option. I'm using the 5V and so I've connected a wire from the 5V connection to one of the electrodes on B side (28th electrode) and the COM ports goes to the A side (4th electrode) and also to 1_WIRE_LO_REF.
Now I'm thinking if the program if not working. Because it seems that we are getting (seemingly) proper values for the first sixteen and something's messing up the values for the the rest of the electrodes.
Do I have to use two 24X1 MUXs i.e, use physically different boards and also two different programs to measure them? Or I can just use 1-24 as 24X1 and 25-48 as another 24X1 in the same board and measure them through the same program? Thanks in advance.
Message Edited by ERT_LSU on 09-17-2007 04:00 PM -
Trying to measure voltage through SCXI-1127/1331 2-wire connection [ Edited ]
Hai ,
this is madhava from LSU,I am working on ERT with NI hardwares like 1)chasis 1000 2) DMM PCI-4060 3) SCXI -1331(2 in number)
I have a system with two large glass plates standing vertically and placed parallel to the user.I am trying to flow different liquids of density through the channel in between.Please see a attached picture of it.
There are total of 48 electrodes 24 on each side to which wires are connected. On each side there are 3 rows with 8 electrodes/row, say 1-24 on side A and 24-48 on side B. The medium between the two sides is salt water.
I want to measure the potential in such a manner that I can calculate the voltage difference between all possible electrode combinations between side A and side B.I have connected a two end power source to side A and side B, i.e. +ve to side A and -Ve to side B , so the electrode on the A side acts as the "source" and the electrode on the B side acts as "sink".
I want to use 2 SCXI- 1331 's for this experiment.
I tried it with 1 SCXI - 1331, but did not get proper values.So what do you suggest shall I continue this with the 1 wire or could you please help me with the two wire experiment, so that I can get more combinations.
I hope you respond soon and in the affirmative.
With regards
Madhava
Attachments:
Scanning_of_SCXI-1331_48_write.vi 144 KBWelcome to the discussion forums, Madhava!
The optimal solution is to have a 2x48 (or more) matrix so
that you could easily choose one point on either plate (column) connected to
one lead of the DMM (row0) and another point on the other DMM lead (row1).
Since the SCXI-1127 doesn’t support this configuration, you’ll have to try
something else with your existing hardware.
Because you can only use a multiplexer setup instead of a
matrix for your number of signals, the closest you can get to the above
suggestion is to measure one electrode to ground and then read the next
electrode to ground and include logic to find the difference between the two voltages.
I suggest you start with a LabVIEW shipping example (Help » Find Examples) such as niSwitch
DMM Switch Synchronous Scanning.vi or niSwitch
DMM Switch Handshaking.vi (found under Hardware
Input and Output » Modular Instruments » NI-SWITCH). You will have to modify
it to include another SCXI-1127 and set them both up in a 1-wire 64x1 multiplexer
topology. Take measurements as quickly to each other as possible on both
switches. Again, this is a workaround to what you really should be doing for
optimal performance (and the easiest setup).
The last option is to limit your measurements to electrodes
directly across from each other (or any other fixed mapping setup) and use a
2-wire 32x1 multiplexer topology. By nature, this is taking a differential
signal measurement between two constant points. This would allow you to easily
use LabVIEW’s shipping examples without modification.
I hope this helps you get a feel for your options and the
consequences of each.
Mark E.
Precision DC Product Support Engineer
National Instruments
Digital Multimeters (DMMs) and LCR Meters
Programmable Power Supplies and Source Measure Units -
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Microsoft Windows [Version 6.1.7601]
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STATUS of the LISTENER
Alias LISTENER_SQLWEB
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Start Date 26-JUL-2012 12:15:26
Uptime 0 days 0 hr. 29 min. 10 sec
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SQL*Plus: Release 11.2.0.1.0 Production on Thu Jul 26 12:46:04 2012
Copyright (c) 1982, 2010, Oracle. All rights reserved.
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Programmed vs measured voltage on Keithley 2400 and other things
Hello everyone,
I have two issues with our Keithley 2400, which we control through Labview, and I would be very grateful for some help/advice. The issues are listed below:
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Al
Regards,
Al C
National Instruments,
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ThanksHi,
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Attachments:
CI20 Connection for Voltage.gif 38 KB -
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Can the USB-9211 be used to measure voltages ? It is designed for thermocouple measurements and its operating manual states there is a current source between its TC+ and TC- input terminals.
What amount of current is flowing ? Does it depend on the selected thermocouple type ? Can the current level be controlled by sotware ?
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its peak to peak input noise is 1 uV rms as indicated in the specs.
So as long as the measurements allow for enough settling time (12S/s), each one is accurate. -
Measuring voltage from thermocouples
How do i measure voltage from a thermocouple which is joined to another one. Meaning that they have a common point. I have tried reading in a voltage from 1 point and then subtracting it with the other but it does not give me the reading the multimeter is showing
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For troubleshooting bad readings, probably the first thing to do would be to check the board's configuration.
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Once you have all the signals connected to your DAQ board, try running a MAX Test Panel. I usually run it using Continuous Mode. Before starting the acquisition, check the input limits in MAX, adjust them according to the input signal so that the board applies the appropriate gain.
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ading the correct temperature? Is the CJC in your terminal block enabled? It's always easier to compare the temperature than the millivolts readings.
I hope these tips help. Good luck with your application! -
Equipment used:
- Connector Block CB-68LPR
- DAQ Board NI6013
- VI Logger
- Pressure tranducer (runs on 5V)
What am I trying to do:
- Connect pressure tranducer to connector block, so I can display measured voltage in VI Logger.
What I have done:
- Pressure tranducer has got -Vin +Vin +Vout. I have connected +Vout to AI ch0 and -Vin to AI ch8 (differential).
- In VI Logger, I have created virtual channel that is reading Voltage (max 50V, min -50V).
The problem I have got:
- VI Logger is reading 5V all the time. The voltage should increase/decrease lineary as the pressure is increased/decreased
but it doesn't. It is always 5V that is not true. I have tested the device in the test panel and Vout (ch0.) is always 5V exact.
How
to solve this problem? What and how should I check, have I connected everything properly?
Thank you.
Regards Slav.I had a similar problem. I changed the input from differential to single ended and it works. You need to connect your V- to Agnd. Unless there is a reason you need to read differential...thermocouples that I set up work fine in differential but there is no common ground to a voltage source.
Make sure you have set up the Virtual Instrument in MAX properly. Good luck.
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