Backdating 6
Keysight 53210A/53220A/53230A Assembly Level Service Guide 261
As engineering changes are made, newer instruments may have higher serial
prefix numbers than those listed in Table 6-1. The service guides for these
instruments may be supplied on an updated CD-ROM containing the required
service information. Use the procedures on the updated CD-ROM that came with
your counter. If you have any questions about your Keysight 53210A/53220A/
53230A Counter, contact the nearest Keysight Technologies Sales and Support
Office as shown in the front of this guide.