HEKA Elektronik EPC 10 USB, Hardware Manual, Page: 43 / 81

5.2 EPC 10 USB Menu 37
5.2 EPC 10 USB Menu
5.2.1 Test and Calibrate Menu
Figure 5.24: EPC 10 USB menu
Calibrate: Performs a full calibration of the
EPC 10 USB
. The result of this calibration may be stored as a
SCALE-xxxxxx.epc
and
CFAST-xxxxxx.epc
files. The
SCALE-xxxxxx.epc
file contains the settings of the digi-
tal switches and controls of the amplifier. These are unique to the amplifier and cannot be used for another
EPC 10 USB
. A calibration should be performed in intervals of about 6 months or whenever the frequency re-
sponse of the amplifier is not accurate or offset currents become noticeable. The
CFAST-xxxxxx.epc
file contains
the C-fast Lookup Table. Depending on the speed of the computer, the calibration process takes 5-10 minutes.
Note: Calibrations should be performed after the amplifier and probe have reached normal operation
temperature (i.e., powered up for at least 30-60 minutes)
Full Test: Performs a hardware test. This generates a list of diagnostic values. This may be used to inform the
manufacturer (HEKA) about the condition of the
EPC 10 USB
. If you have any doubts about your
EPC 10 USB
test, please contact HEKA to find out whether or not it needs to be serviced.
External Gain Calibration: This option allows to use an external precision resistor to improve the internal,
automatic Gain calibration. Usually there is no need to perform an external Gain correction, but some users may
chose to do so. A Gain correction factor can be given for each Gain range, i.e., low, medium, and high Gain .
Thus, this enables a ”user specified” gain correction factor for matching the computed R-membrane value with a
calibration resistor.
External Zero Calibration: The same as for External Gain Calibration but an offset correction factor for the
three Gain ranges.
Scale from/to EEPROM: If selected the calibration file (scale file) is loaded from the EEPROM of the amplifier.
The calibration procedure also writes the scale file to the EEPROM. This option only exists for newer
EPC 10 USB
amplifiers (since revision R for USB amplifiers and revision S for PCI amplifiers).
Scale from/to Disk: If selected the calibration file (scale file) is saved/loaded to/from a file stored on the
hard-disk of the host computer. The calibration procedure also writes the scale file to a file on disk.
Save Protocol: Saves the protocol file of a Full Test.
Print Protocol File: Prints the protocol file of a previously saved Full Test.
http://www.heka.com