B&K 1787B - Manual (Page 27)

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byte Check sum
Chapter 5 Calibration
We suggest you to calibrate the power supply yearly. We provide you a set of calibration software Power
Calibration (PC1785B_1788). It is very easy to calibrate the power supply by the calibration software.
Please make the following preparation before the calibration.
1. Please prepare a high accuracy multi-meter (the accuracy should be higher than the power supply).
Prepare to use the multi-meter to measure the output voltage and short circuit current of the
calibrated power supply.
2. Use IT-E131 communication cable to connect the DB9 interface connector of the power supply and
the RS232 interface connector of the computer.
3. Install the PC1785B_1788 calibration software on your computer, and start the software.
After doing the above preparation, then you can calibrate the power supply easily by the software step
by step. Please refer the following calibration process.
Note: When the power supply receives a frame command, it will check the frame
command, if the check sum is correct, then it will return to 90H, if there is
any error on setting parameter or over parameter, then it will return to A0H, if
the command wasn’t executed, then it will return to B0H, if the command
isn’t effective, then it will return to C0H. Or otherwise, it will return to 80H.