# Re: ISR video attenuator

**URL:** <https://psychtoolbox.discourse.group/t/re-isr-video-attenuator/983>\
**Category:** Uncategorized\
**Created:** [November 11, 2001, 4:23pm UTC](https://psychtoolbox.discourse.group/t/re-isr-video-attenuator/983 "2001-11-11T16:23:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![denispelli](https://avatars.discourse-cdn.com/v4/letter/d/cdc98d/32.png) [@denispelli](https://psychtoolbox.discourse.group/u/denispelli)\
**Post date:** [November 11, 2001, 4:23pm UTC](https://psychtoolbox.discourse.group/t/re-isr-video-attenuator/983/1 "2001-11-11T16:23:43Z")

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> \>Dear Dr. Pelli,  
> \>  
> \> I am interested in buying the ISR attenuator. Before, I  
> \>wanted to make sure it will match other parts. In the VRG web  
> \>page it is said that it will only work well if the (RGB) monitor  
> \>to be used have a Termination Switch. Is it so? Is that the case  
> \>for both PC and MAC? Does it make a difference for the  
> \>attenuator functioning if it is connected to a PC or MAC?

if you can switch out the termination, then you can drive all three guns   
and have a white display. otherwise you can drive just the green gun and   
have a green display. white is nice, but green is ok too. in my lab, our   
displays don't allow us to switch out the termination, so we use them   
green.  
  

> \> Can you indicate any Sony model that will work well? Eisa  
> \>says their models have the switch, but give no technical support  
> \>in Brazil.

sorry, i'm not up to date on model numbers. what i know about this is on   
the web page.  
[http://vision.nyu.edu/Tips/Monitors.html](http://vision.nyu.edu/Tips/Monitors.html)  
  

> \> And last, the cheapest cientific grade photometer for monitor  
> \>calibration (in cd/m2) I could find cost US$ 1500 (the optiCal).  
> \>Any recomendation of a better offer would be appreciated.

what i know about this is on the web page.  
[http://psychtoolbox.org/measure.html](http://psychtoolbox.org/measure.html)  
  

> \>Thank you for your time,  
> \>Yossi

please direct general information questions, like this, to the   
psychtoolbox forum, so that others can participate. david, allen, and i   
receive copies of all forum letters.  
[psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com)  
  
good luck.  
  
denis  
  
NOTE: [denis.pelli@...](mailto:denis.pelli@...) is my preferred email address. Please use that   
address. My "verizon.net" address will go away soon, partly because   
Verizon forces me to use that as my return address.