6Backdating
260 Keysight 53210A/53220A/53230A Assembly Level Service Guide
Introduction
This chapter contains information necessary to adapt this service guide to older
instruments.
The backdating information includes the following:
–Backdating Firmware
– Procedure Changes
– Backdating Hardware
– Backdating Specifications
Serial numbers
This guide applies directly to counters with the serial prefixes listed in Table 6-1.
(See also Figure 6-1.)
The serial number prefix for your counter is the first 5 character positions in the
serial number shown on the counter (for example: MY50000125). The counter
serial number suffix (for example: MY50000125) is the production number of the
counter. The whole number (MY50000125) is the actual serial number of the
counter. See Figure 6-1.
Table 6-1 Instruments this guide directly applies to
Instrument Serial prefix number
Keysight 53210A 350 MHz 10-Digit RF Counter MY500 or SG500
Keysight 53220A 350 MHz 10-Digit Universal Counter MY500 or SG500
Keysight 53230A 350 MHz 12-Digit Universal Counter MY500 or SG500
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