Chamber cover removed exposing rotating
fixture. Test heads may be fixtured  from 2
to 48 contacts.  Up to 254 parts may be
tested in one chamber  (depending upon
components tested).  Figures 1A and 1B show the temperature
transition of the 4220 chamber from one end of
the temperature  range to the other.  Figure 1A - Temperature transition -60 to + 150deg.
Celsius.  Figure 1B - Temperature transition + 150deg.
to - 60 Celsius.  SAUNDERS & ASSOCIATES, INC.  6300187-04

 S&A  4220MR MECHANICAL REFRIGERATION  CHAMBER FOR PARAMETRIC TESTING  •  Stability: +/-  0.1 degree C including effects of line voltage, ambient     temperature and aging.  •  Uniformity:  +/-  0.2 deg. C component area  •  Temperature range: -55 C to + 150 C (+200°C max. temperature optional)  •  Rate Change:  See figures 1A and 1B  •  Energy Use: 6-7 KVA typical depending on temperature  Specifications are valid for the chamber equipped with a four inch high cover, a
component support wheel and a dual row crystal test wheel i nstalled.  •  Coolant: Water Cooled Mechanical refrigeration:  More energy efficient, improved reliability, lower heat load in working     
environment. (Air cooled refrigeration unit optional.)  •  LN2 or CO2: Coolant boost options available      •  Programmable keyboard: Programmable keyboard allows temperature to be    set, stepped (at user-defined increments), slewed (at user-defined rates) and
cycled  •  Remote Operation: Chambers may be remotely controlled via IEEE bus or  RS232C port  •  Flexible Tooling: Can be easily customized for testing needs