2
Manual Printing History
The manual printing data and part number indicate its current edition. The printing date changes when a
new edition is printed. The manual part number changes when extensive technical changes are
incorporated.
October 2008
……………………………
First Edition
Notice
The information contained in this document is subject to change without notice.
Safety notice supplement
As described in the International Electrotechnical Commission (IEC) Standard IEC 664,
digital multimeter measuring circuits (e.g., Tonghui Models 1951, 1961, 1941, and 1942)
are Installation Category II. All other instruments
‘
signal terminals are Installation Category I
and must not be connected to mains.
This equipment is POLLUTION DEGREE 2, INDOOR USE product.
Safety Precautions
Users of this product must be protected from electric shock at all times. The responsible
body must ensure that users are prevented access and/or insulated from every connection
point. In some cases, connections must be exposed to potential human contact. Product
users in these circumstances must be trained to protect themselves from the risk of electric
shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the
circuit may be exposed.