Martel Electronics 235 - Manual (Page 8)

Operation
The Model 230/235 Temperature Calibrators are user friendly and
menu driven. A first time user can normally start operating the unit
with little or no instruction. The following instructions are intended to
provide a detailed understanding of the unit.
Power On Sequence
The calibrator is turned on or off by pressing the ON/OFF key. Each
time it is turned on, a series of internal tests and calibrations are
performed. The start up tests provide pass/fail tests of certain internal
circuitry. If the tests determine the unit has an internal failure, a
message is displayed and the unit may or may not allow further
operation. A list of error messages can be found on page 71.
The start up calibrations provide for dynamic recalibration of the
internal calibrator support circuitry by applying the primary reference
voltages to points in the circuitry and recording the readings as
references for further measurements. The start up auto calibration
does not in any way affect the primary calibration done at the factory
or at a field metrology lab.
During the time the start up tests and calibrations are being performed,
certain informational displays are presented to show the status of the
calibrator. The first message displayed will be:
Operation
230/235 3
CAUTION: The operation of the calibrator may be impaired if a two-
way radio is keyed near the unit.
BETA Calibrator
Last cal 080593