Best strategy of temperature for 6289?

[SiPHER]

Hello,

Are there any simple and accurate method for measuring temperature by 6289? I have several 3-wire RTD, so I guess I need some conditioner between RTD and 6289. Do you have any recommendation? Is it possible to connect some thermocouples at the same time?

Thanks a lot.

sipher

[Ryan_V[DE]]

sipher,

We offer signal conditioning options such as SCC, which would certainly work for your application. In an SCC signal conditioning application, you use a carrier connected to your DAQ Device, and modules which are inserted into the carrier for your specific type of signal conditioning. Specifically, we offer thermocouple and RTD modules.

With only your DAQ device, thermocouples would be the easiest option as you could connect them directly to the differential inputs of your 6289. You would also need to make sure that they are ground referenced by placing a large (~1MOhm) resistor from one of the leads of the thermocouple to ground. The only problem with this is that the signals will be incredibly small and noisy. It will be difficult to get accurate temperature measurements. Our thermocouple input devices provide both amplification and filtering to account for this.

In order to use your RTDs, you would need to provide some form of current excitation. This could produce a larger signal which it would be easier for your DAQ card to measure. There would still be the potential for noise, however, depending on the length of your leads.

Hope this helps,

[SiPHER]

Hello Ryan,

Thanks for your reply.

According to your suggestion, I plan to order following items:

1. SCC-TC02

2. SCC-RTD01

3. SC-2345 (panelettes, side conn, power from DAQ device)

One question is that the cable between 6289 and SC2345. Currently we have SHC-68-68-EPM and BNC-2110. Should I order another SHC-68-68-EPM for SC2345? Please suggest.

by the way, do you have 4-wire RTD 100ohms Pt wire?

Thank you very much.

sipher

---------------------------------------------

sipher,

We offer signal conditioning options such as SCC, which would certainly work for your application. In an SCC signal conditioning application, you use a carrier connected to your DAQ Device, and modules which are inserted into the carrier for your specific type of signal conditioning. Specifically, we offer thermocouple and RTD modules.

With only your DAQ device, thermocouples would be the easiest option as you could connect them directly to the differential inputs of your 6289. You would also need to make sure that they are ground referenced by placing a large (~1MOhm) resistor from one of the leads of the thermocouple to ground. The only problem with this is that the signals will be incredibly small and noisy. It will be difficult to get accurate temperature measurements. Our thermocouple input devices provide both amplification and filtering to account for this.

In order to use your RTDs, you would need to provide some form of current excitation. This could produce a larger signal which it would be easier for your DAQ card to measure. There would still be the potential for noise, however, depending on the length of your leads.

Hope this helps,

[SiPHER]

Any comments? Thanks.

sipher

[Ryan_V[DE]]

sipher,

Looks like a great configuration. Your current cable will work just fine, but it never hurts to have more than one. As for RTDs, we only offer 3-wire in both ready-made and field-cuttable varieties. 

Regards,

[SiPHER]

Ryan,

Thanks for your help. I have put order.

sipher