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Entry  Thu Aug 4 15:15:32 2016, Aidan, Summary, TempCtrl, RTDs used in aLIGO TCS RHs 
    Reply  Thu Aug 4 18:01:03 2016, rana, Summary, TempCtrl, RTDs used in aLIGO TCS RHs 
       Reply  Fri Aug 5 00:08:16 2016, awade, Summary, TempCtrl, RTDs used in aLIGO TCS RHs 
       Reply  Tue Aug 30 10:56:51 2016, Aidan, Summary, TempCtrl, RTDs used in aLIGO TCS RHs 
          Reply  Mon Oct 10 21:01:52 2016, awade, Summary, TempCtrl, RTDs used in aLIGO TCS RHs 
Message ID: 1711     Entry time: Tue Aug 30 10:56:51 2016     In reply to: 1701     Reply to this: 1742
Author: Aidan 
Type: Summary 
Category: TempCtrl 
Subject: RTDs used in aLIGO TCS RHs 

Here's the RH driver PCB for aLIGO:

https://dcc.ligo.org/DocDB/0021/D1002529/006/Driver_RingHeater.pdf

It uses this power amp: https://www.digchip.com/datasheets/download_datasheet.php?id=508953&part-number=LM12CLK

 

Quote:

The heater driver in the old design (iLIGO PSL) is this horrible programmable power supply with high output noise (see measurement of 40m PSL heater).

What we want instead is something that takes in +/- 10 V and drives a DC current (not PWM) into our heaters (which are ~50-100 Ohms). A BUF634 is almost good enough; it can do 200 mA at 10 V. Is there a BUF634 equivalent which can do more like 500 mA? Otherwise we can just use a opamp + transistor.

What is being used for the ring heaters at the LIGO sites?

 

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