8 Keysight 53220A/53230A User’s Guide
Protection limits
The Keysight 53220A/53230A 350 MHz Universal Frequency Counter/Timer
provides protection circuitry to prevent damage to the instrument and to protect
against the danger of electric shock, provided the Protection Limits are not
exceeded and the instrument is properly grounded. To ensure safe operation of
the instrument, do not exceed the Protection Limits defined on the front panel:
The BNC shells of the input terminals are connected to the instrument
chassis. Verify signal polarity before making any connections to the input
terminals.
1 Watt Max into 50W
!
Channel / Setup
During battery operation, the maximum measured signal supplied by the
user is +42 V.
Product Options 201/202 add parallel Channel 1 and Channel 2 inputs to the
rear panel of the instrument. Signals on the center conductor of either
panel’s channel BNCs are also present on the corresponding center
conductor of the BNC on the opposite panel.
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