Testing Facilities and Equipment (cont.)
 The second vacuum facility shown on this page is a four-bell jar system, for testing a number of devices simultaneously, but at four different conditions. The four glass bell jars are 10 inches in diameter and 12 inches high. This facility has its own vacuum ion pump (500 l/s capacity down to 10 -8 Torr). Each bell jar has its own angle valve to isolate it from the rest of the system, for operating at different conditions (hard vacuum or argon, environment, for example) for intermittent examination of test articles, or replacement with new articles while continuing the tests in the other three bell jars.
 The articles in each jar can be independently controlled using the existing HP3852A multi-purpose data acquisition / control unit for voltage and temperature measurements.
The fully assembled four-bell jar vacuum test facility is shown below. |
