Memmert TTC 256 Temperature test chamber (Generation 2003) - Manual (Page 57)

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Advanced functions
7.6.4 Log memory
The controller continually logs all relevant measured values, settings and error messages at
1-minute intervals. The internal log memory is listed as a ring memory, i.e. the oldest log data
are always overwritten automatically with new data.
The logging function cannot be switched off, but is always active. The measured data are
stored in the controller, safe from manipulation. For documentation purposes the controller
memory can be read out via the Celsius control software. Each dataset is stored with a unique
timestamp.
The internal log memory has a size of 1024 kB. This corresponds to a storage capacity for
about three months in permanent operation.
Since large amounts of data are stored during ramp mode, this can reduce the maximum log-
ging time.
If the power supply is interrupted, the time of the power cut and the return of voltage are
stored in the controller.
Reading in the log memory to the PC via USB interface
The log data can be read out either via the USB interface and then printed out from the
PC or via a connected PCL3-compatible printer.
Using the “Celsius” programme the log memory of the controller can be read out to a PC
and from there be displayed graphically, printed out and stored.
The log memory of the controller is not modified or deleted by the reading out.
Printing out log memory
(see also Chapter Printer on page 46 )
For a printout, the GLP header is also printed automatically, and contains the following details:
► Date of printout
► Period of logging
► Consecutive page numbers
► Serial numbers and appliance name
If the printer is not ready (e.g. ink cartridge or paper tray empty), no log data will be lost.
Multiple printouts can also be made, since the log memory is not deleted after printing.