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71M6511/71M6511H Demo Board User’s Manual
1.9.3 UPDATING THE 6511_DEMO.HEX FILE
The io_merge program updates the 6511_demo.hex file with the values contained in the macro file. This
program is executed from a DOS command line window. Executing the io_merge program with no
arguments will display the syntax description. To merge macro.txt and old_6511_demo.hex into
new_6511_demo.hex, use the command:
io_merge old_6511_demo.hex macro.txt new_6511_demo.hex
The new hex file can be written to the 71M6511/71M6511H through the ICE port using an in-circuit emulator.
This step makes the calibration to the meter permanent.
1.9.4 UPDATING CALIBRATION DATA IN FLASH MEMORY WITHOUT USING THE
ICE
It is possible to make data permanent that had been entered temporarily into the CE RAM. The transfer to
flash memory is done using the following serial interface command:
>]U
Thus, after transferring calibration data with manual serial interface commands or with a macro file, all that
has to be done is invoking the U command.
Similarly, calibration data can also stored in EEPROM using the CLS command.
After reset, calibration data is copied from the EEPROM, if present. Otherwise, calibration
data is copied from the flash memory. Writing 0xFF into the first few bytes of the EEPROM
deactivates any calibration data previously stored to the EEPROM.
1.9.5 AUTOMATIC GAINS CALIBRATION
Starting with Demo Code revision 3.04, it is possible to perform a simple automatic calibration. This
calibration is performed for resistive loads only and will not correct phase angle . The steps required for the
calibration are:
1.
2.
3.
4.
5.
6.
Enter operating values for voltage and current in I/O RAM. The voltage is entered at address
0x2029 (e.g. with the command )29=+2400 for 240V), the current is entered at 0x202A (e.g. with
the command )2A=+300 for 30A) and the duration measured in accumulation intervals is entered
at 0x2028.
The operating voltage and current defined in step 1 must be applied to the meter (Demo Board).
The CLB (Begin Calibration) command is then entered via the serial interface. The operating
voltage and current must be maintained accurately while the calibration is being performed.
The calibration procedure will automatically reset CE addresses 08, 09, 0x0A, 0x0B, 0x0C, and
0x0D to nominal values (0x4000), and 0x0E, 0x0F and 0x10 to zero prior to starting the calibration.
Automatic calibration also reads the chip temperature and enters it in CE location 0x11 for proper
temperature compensation.
Completion of the automatic calibration will be signaled by the LCD showing the “HELLO” message.
Enter M3 or another serial interface command to bring the display back to normal.
CE addresses 0x08 and 0x09 will now show values other than 0x4000. These values can be stored
in EEPROM by issuing the CLS command.
Note: Current transformers of a given type usually have very similar phase angle for identical operating
conditions. If the phase angle is accurately determined for one current transformer, the corresponding phase
adjustment coefficient PHADJ_X can be entered for all calibrated units.
Page: 32 of 115
? 2005-2007 TERIDIAN Semiconductor Corporation
Revision 5.4
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