Anritsu MD8470A, Operation Manual, Page: 4 / 114

For Safety
WARNING
1. ALWAYS refer to the operation manual when working near locations
at which the alert mark shown on the left is attached. If the opera-
tion, etc., is performed without heeding the advice in the operation
manual, there is a risk of personal injury. In addition, the equipment
performance may be reduced.
Moreover, this alert mark is sometimes used with other marks and
descriptions indicating other dangers.
2. Measurement Categories
This instrument is designed for Measurement category I (CAT I).
Don’t use this instrument at the locations of measurement categories
from CAT II to CAT IV.
In order to secure the safety of the user making measurements, IEC
61010 clarifies the range of use of instruments by classifying the lo-
cation of measurement into measurement categories from I to IV.
The category outline is as follows:
Measurement category I (CAT I):
Secondary circuits of a device connected to an outlet via a power
transformer etc.
Measurement category II (CAT II):
Primary circuits of a device with a power cord (portable tools, home
appliance etc.) connected to an outlet.
Measurement category III (CAT III):
Primary circuits of a device (fixed equipment) to which power is di-
rectly supplied from the power distribution panel, and circuits from the
distribution panel to outlets.
Measurement category IV (CAT IV):
All building service-line entrance circuits through the integrating
wattmeter and primary circuit breaker (power distribution panel).
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