Keysight 53220A/53230A User’s Guide 5
Lithium Battery Recycling
The 53220A/53230A counters contain a 3 V “coin cell” lithium battery. Keysight
recommends that this battery be replaced every year at the instrument’s 1-year
calibration interval. Replacement procedures are provided in the 53220A/53230A
Service Guide.
Option 300 provides battery operation of the 53220A/53230A using a 12 lithium
battery. Performance of this battery will degrade over time as a function of the
number of battery charge/discharge cycles.
Refer to local, state, or Federal regulations when disposing of, or recycling either
battery.
Safety Symbols
The following symbols on the instrument and in the documentation indicate
precautions which must be taken to maintain safe operation of the instrument.
Standby Power. Unit is not completely
disconnected from AC mains when
power switch is in standby position.
Frame or chassis (ground) terminal
Caution, risk of danger (refer to this
manual for specific Warning or Caution
information)
IEC Measurement Category I. Do NOT
connect inputs to AC mains or to
circuits derived from AC mains.
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