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Message ID: 460     Entry time: Mon Jan 31 21:40:50 2011
Author: Frank, Tara 
Type: Summary 
Category: DAQ 
Subject: new channel for frequency counter added 

We added a new channel C3:PSL-FSS_FREQCOUNT which contains the analog output of the SR620 frequency counter connected to the beat photodiode.

 

  • C3:PSL-FSS_FREQCOUNT is connected to CH6 of the first 3123 card, connector P3 (first D-SUB). This is also J4 of the PSL x-connect.
  • Added channel entry in fss.db database. Sampling rate is 10Hz.  Scaled from -10 to 10V in unit  "volts" as we don't know which settings we will use later.
  • Also added channel to daqd. restarted daqd. Manual restart of daqd as controls using script requires password for controls.
    That shouldn't be so but i was to lazy to search for the bur

 

Counter output is 0 to 8V, right now used in relative mode which means zero frequency deviation equals 4V. Current gain for first test is 100kHz/V.

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