connecting RS technology torque convertor to the wiring board of a ni scxi 1314, whats the best way considering that this reads botht the input torque vs. time as well as the input torque vs. angle?

[G_Lo]

bbudziszek,

If I understand your question correctly, it seems like you are comparing the setups between chapters 2 and 3 of the manual.  Chapter 2 of the manual describes setting up different bridge configurations for transducer measurements.  Chapter 3 contains calibration information concerning the 1520 with quarter, half or full bridge configurations. Calibration involves comparing an instrument’s performance to a standard of known accuracy.  This link explains a little more about calibration.  Basically, they are unique setups where Ch.2 (Faris' suggestion) is for reading data and Ch.3 is for improving accuracy.  Please let me know if this helps with your question.

[bbudziszek]

HI G Lo,

Well i am more interested in the wiring techniques to the 1314 board that connects to the 1520. the problem i am struct with is whether the wiring setup for a transducer that has ten wires on the 1314 board should change to accommodate the calibration wiring setup or is the wiring setup just as an addition to the original setup? basicaly in chapter two to obtain a 350ohms for calibration i would have to use the bridge completion pin, but the wiring setup for a quarter bridge indicates that the s- remains unpinned as it were. now is that just for the calibration and then after the calibration i have to go back in a unpin the calibration setup and repin the s- so i can get a torque reading? or do i have it all wrong. i have read the chapters a tried my best to endulge in theory, but for now i am curious about how to physically wire in a transducer as well as to setup calibtration all on one screw terminal bridge without breaking any sensors, or machines.

-Bob

[bbudziszek]

Hi G Lo,

           let me know if this sounds possible. i have a transducer that has three wires used for calibration, one is for a bi-directional calibration. the three wires i need to use are labeld as (-)excitation wire which corresponds to p- (1314), (+) excitation wire which corresponds to p+, and  (+) signal wire which corresponds to s+.

(+)excitation wire has to go to (+) calibration connection, the (-)excitation wire has to go to (-) calibration connection, and finally the (+) signal wire has to go to a Rcal.

i am wonder if i could, now i am working with full bridge shunt calibration tranducers and load cells, maybe connect the corresponding SCA to p- and the s+ to the quarter bridge  and then the quarter bridge to the other SCA to a get a full 350ohms for the calibrations, and to include the p+ i would do the same thing but instead user the SCB and run it to the quarter bridge and then the s- to the quarter bridge as well, or should i use the s+?

-bob 

[G_Lo]

Bob,

The connection will depend on the calibration that you wish to achieve.  If you would like to calibrate the 1520 using self-cal or external calibration then you would have to remove the transducer.  If you would like to calibrate the reading for your transducer then you would leave the connection as it is.  What is needed to calibrate a transducer is an excitation voltage and a differential reading.  This process involves finding the gain and offset errors and compensating for them.  It sounds like you have a quarter-bridge transducer.  If this is the case, you can connect the transducer to the 1314 as shown on page 21 of the manual.  The 1314 and the 1520 combined will complete the bridge for you and no external completion needs to be made.

[bbudziszek]

my transducer is a full bridge and i am going to mimic the set up on page 21 but to also include the use of scb as well as sca to complete the bi-directional calibration. i am going to leave the transducer connected because the transducers themselves contain a calibration item. but other then that i hope it works. the real only problem that i have crossed now is that the calibration really only requires one signal wire for the Rcal, but both +/- excit wires. i am worried about using a + signal wire to connect to a resistor to connect to another + excit wire to calibrate bi-directionally. is that a good idea or a bad idea?

thanks for your help so far. and please for give my ignorance.

-Bob

[G_Lo]

Hi Bob,

I was taking a closer look at the information that you provided for your transducer.  Since you have a full bridge, you should have 4 wires coming out of your transducer.  These wires should be placed into P+, P-, S+, S-.  The setup for full bridge is detailed on pg.25 of the manual and all of the specifications can be done in software.  The setup on pg.25 of the manual is all of the wiring that needs to be done.  With our hardware, you will not be able to accomplish + Calibration and - Calibration with one setup, though.  You can wire the bottom SCA to S+ and the top SCA to E+ to achieve + Calibration.  You can wire the bottom SCA to +S and the top SCA to -E to achieve - Calibration.  The shunt resistor located on the SCXI-1314 is going to be used in place of your Rcal in the above setup suggestions for + and - Calibration.

[bbudziszek]

G Lo,

i was wondering how do i go about getting an engineering to come over to my lab and assist me in the proper set up of the Labview. i can get the basics but now that i am trying to calibrate my transducer through labview and preparing to run a test i would like a more assurance that what i have isnt going to burst into flames...;-) we do have a service contract with labview i believe. let me know and thank you much so far.

-Bob

[G_Lo]

Hi Bob,

I am going to need some contact information so that I can refer you to our Internal Sales Representatives.  You can post some contact information (e-mail) in this thread or I can find this internally with your permission.  Please let me know which you are most comfortable with. 

[bbudziszek]

Bobby Budziszek

Lab Technician

bbudziszek@reminc.net

REMINC

Research Engineering & Manufacturing Inc.

55 Hummarlund Way, Tech II

Middletown, RI 02842

Tel: (401) 841-8880

you can also see what you guys have in the system, and if you do you may better find information under John Reynolds keeping the same company info.

-Bob