Keysight 53210A, User Manual, Page: 8 / 247

8 Keysight 53210A User’s Guide
Protection Limits
The Keysight 53210A 350 MHz RF Counter 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:
WARNING
Do not connect the input channels of the 53210A to AC line-voltage mains
or to circuits derived from AC mains. The instrument must be used in CAT I
(isolated from mains) applications only. Do not use in other IEC
Measurement Category (CAT II, CAT III, or CAT IV) applications. Failure to
observe these precautions may result in electric shock and serious personal
injury.
WARNING
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
WARNING
During battery operation, the maximum measured signal supplied by the
user is + 42V.
WARNING
Product Options 201/202 add a parallel Channel 1 input 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.