Agilent Technologies
34171B DMM
Input Terminal Block
(for the 34401A, 34410A , 34411A, and L4411A DMMs)
Product Description and Install ation
Before making co n n ections to the terminal block, be sure to disconnect all external live
voltages present on user wiring .
To prevent possible shock haza rd , the cover mus t always be used with the terminal block
base.
WARNING
Description
The Agile nt 34171B Input Term in al Block simplif ies connections to the input terminals of
the Ag ilent 34401A, 34410A, 34411A, and L4411A Digital Multimeters ( DMMs). Th e
34171B replaces the 34171A.
The terminals of the terminal block (cover removed) are shown and described below.
H 4W SENSE
L 4W SENSE
H INPUT
L INPUT
I
H and L Input Terminals. The H and L input terminals are used for voltage, resistance,
capacitance, and diode test measurements. The Protection Limit from H to L is 1000 VDC
or 750 VAC, which is also the maximum voltage measurement. This limit can also be
expressed as 1000 Vpk maximum.
The L input terminal can safely "float" a maximum of 500 Vpk relative to ground provided
that the Protection Limit for the H input terminal does not exceed a maximum of 1000 Vpk
relative to ground.
I Current Input Terminal . The current input ("I") terminal has a Protection Limit of 3A
Copyright
©
2007 Agilent Technologies, Inc. All ri ghts reserved
(rms) maximum current flowing to the L input terminal. Note that the current input
termina l will be at appro ximately the same voltage as the L t erminal.
H and L 4W Se nse Termi na ls. The H and L sense terminals are used for four-wire
resistance measurements. The Protection Limit is 200 Vpk for each of the following
termina l pairings:
L 4W Sense to L Input
H 4W Sense to L Input
H 4W Sense to L 4W Sense
Installation
1. Remove the cover by loosening the screw on the terminal block base using a T-15 Torx
bit.
2. Route your wiring (wires not included) through the hole in the cover. The recommended
wire size is 18 gauge or smaller.
3. Connect the wires to the terminals using either the binding posts or by soldering
directly to the terminals. For proper strain relief, bundle t he wires tog eth er and secure
them to the base using a cable tie (see below).
Note: The terminals are made of low-thermal copper alloys to
minimize thermally-induced voltages caused by dissimilar
metals. For minimum thermal of f se t voltages, we recommend
that you use the same wire gauge for all conn ectio ns and use
un-plated copper wire.
Note: The Agilent 34171B Input Terminal Block meets or
exceeds IEC 61010-1 Saf e ty Standards and can be used in
cabling assemblies wi th voltages up to 1000 Vpk.
Agilent Technologies, Inc.
900 S. Taft Avenue
Loveland, CO 80537
Printed in Malaysia
Edition 1 April 2007 E0407
*34171-96002*
34171-96002
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