DHR/AR Series Environmental Test Chamber Getting Started Guide
Page 11
System Specifications
Refer to the table below for ETC system specifications:
1. Ramp Rate: The maximum sustainable ramp rate will depend on a number of factors particularly the start and
end temperature. To determine the maximum sustainable heating/cooling rate, perform the following test and
analysis:
a. Equilibrate to start temperature. Perform a time sweep or peak hold test with the temperature set (if possible)
to a few degrees in excess of the end temperature. Set the time much longer than you expect; the test can
be aborted when the temperature has reached a stable value.
b. Plot a graph of temperature vs. time (min) and take the derivative. Inspect the derivative curve over your
temperature range of interest. The maximum sustainable rate will be the lowest value on the derivative curve.
Table 1:
ETC Specifications
Temperature range
no cooling
LN2 cooling
50°C to 600°C
–160°C to 600°C
Typical ramp rate
Maximum ramp rate up to 60°C/min
1
Internal resolution
0.02°C
