306 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
24 Reference
Measurement Category Definitions
The "Not rated for CAT II, III, IV" measurement category is for measurements
performed on circuits not directly connected to MAINS. Examples are
measurements on circuits not derived from MAINS, and specially protected
(internal) MAINS derived circuits. In the latter case, transient stresses are variable;
for that reason, the transient withstand capability of the equipment is made known
to the user.
Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation. Examples are measurements on
household appliances, portable tools and similar equipment.
Measurement category III is for measurements performed in the building
installation. Examples are measurements on distribution boards, circuit-breakers,
wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the
fixed installation, and equipment for industrial use and some other equipment, for
example, stationary motors with permanent connection to the fixed installation.
Measurement category IV is for measurements performed at the source of the
low-voltage installation. Examples are electricity meters and measurements on
primary overcurrent protection devices and ripple control units.
Maximum Input Voltages
Maximum input voltage at analog inputs
135 Vrms
50Ω input: 5 Vrms Input protection is enabled in 50 Ω mode and the 50 Ω load will
disconnect if greater than 5 Vrms is detected. However the inputs could still be
damaged, depending on the time constant of the signal. The 50 Ω input protection
only functions when the oscilloscope is powered on.
When measuring voltages over 80 V, use a 10:1 probe.
Maximum input voltage at digital channels
±40 V peak
To Next Page
Loading...
