User Manual

2400 Series SourceMeter

User’s Manual Connections 2-9

Figure 2-4

High-impedance guarding (cable guard)

Ohms guard

Use the guarded ohms connection schemes shown in Figure 2-5 for the following

source-measure operation:

• In-circuit resistance measurements on the DUT where other parasitic leak-

age devices are present.

Note that ohms guard must be selected for this connection scheme. Ohms guard

is not available for the 1A range (source or measure). See “Guard selection,”

page 2-13, to select ohms guard and Section 4, “6-wire ohms measurements.”

INPUT/

OUTPUT

4-WIRE

SENSE

IEEE-488

(ENTER IEEE ADDRESS

WITH FRONT PANEL MENU)

V, Ω

GUARD

SENSE

WARNING: NO INTERNAL OPERATOR SERVICA

CAUTION: FOR CONTINUED PROTECTION AGAINST FIR

RS232

DUT

Connect to earth safety ground

using #18 AWG wire or larger.

Guard Shield Test Fixture