IRCAM_PLCC84

Section: User Commands (1)
Updated: July 2012
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NAME

ircam_plcc84 - controls the dummy (alignment) PLCC84 chip in the dewar

 

DESCRIPTION


 This controls a "dummy Hawaii chip" in the dewar. Instead of the actual Rockwell Hawaii sensor, there is
 a PLCC-84 package, on which is mounted 4 red LEDs (controlled by the Pixel bits) and one high-intensity
 green LED (controlled by the Reset bit). There is also a Phototransistor, and a 1k Platinum resistance
 temperature sensor. The primary purpose is to shine light *out* from the dewar, to assist in aligning
 the optics. The platinum thermometer and phototransistor are just extras.
 
 All 4 of the NI4462 channels have their 'cold' (inverting) inputs connected to VRst/2. Quad_0 and 1 have
 their non-inverting inputs connected to (respectively) a Pt 1k temp sensor, and a phototransistor; these
 are pulled up by 10k to Analog +5V, and the sensors are grounded to Analog Gnd. Quad_2 is floating (so it
 reads Analog +5; Quad_3 is shorted to A_Gnd. This allows for the real voltages across the two sensors to
 be accurately calculated.
 
 Usage:  ircam_plcc84 ACTION
 ACTION: leds     red|green|all|off
         measure  light|temp
         calibrate
         help

 

AUTHOR

The author of ircam_plcc84 and this manual page is Richard Neill, <ircam#AT(spamblock)#richardneill.org>
Copyright July 2012; this is Free Software (GPL v3+), see the source for copying conditions.

 

SEE ALSO

ircam(1), ni4462_test(1), pb_init(1)

 

Index

NAME
DESCRIPTION
AUTHOR
SEE ALSO
This document was created by man2html, using the manual pages.
Time: 16:21:52 GMT, November 19, 2013