its size and weight have been reduced to minimum, and all controls have been
grouped on a front panel with a roll-down protective cover.
An integral
bail-style carrying handle, a rugged Formica case, and internal foam
cushioning provide for convenient, safe hand-transportability; and optional,
fitted, fiberglass shipping container provides protection from all normal
shipping stresses on commercial carriers. When fully charged the batteries
maintain control of the chamber temperature for at least two weeks at room-
ambient temperatures.
2.
Specifications.
EMF standard:
Four invertible saturated standard cells
(1.018000 50V) with porous septa. Connections accessible
at four isolated, unplated copper terminal pairs on front
panel.
EMF limit of error:
Guildline test
report supplied to
2
microvolts for each cell, referred to the legal standard of
voltage as maintained by the National Research of Canada
(NRC) and the US National Bureau of Standards (NBS).
May
be sent to NRC or NBS for report to lV or better.
Internal temperature:
32C 0.2C.
Temperature regulation:
Within 0.002C
for
24
hours
in
ambient
temperature of 23C -2C.
Temperature stability:
Drift less than 0.02C for one year.
Drift less than 0.02C after exposure to 0C
Temperature recovery:
or 35C for a period of 1 hour and within 0.005C when
followed by 2 hours in an ambient temperature between 20C
and 28C.
Temperature monitoring:
Independent
internal
thermistor
bridge
connects via front panel terminals
to external null
detector (not furnished).
0.025C
Range:
Resolution:
0.001C
Drift less than 0.01C per year.
Overtemperature protection:
Bimetallic sensor shuts down control
circuit and activates OVERTEMP indicator on the front panel
when the inner chamber temperature exceeds 35C 2C.
Front panel indicators:
AC ON lamp
Meter indication of heater cycling
Meter indication of battery state of charge
Meter indication of overtemperature
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