Ground Unit (Gndu); Basic Circuit Configurations; Basic Characteristics; Ground Unit Connections - Keithley 4200-SCS User Manual

Section 1: Getting Started
The waveforms for a calculation can be input channels (2) and waveforms that are stored in
memory as reference channels (4). For more information about ZTEC, refer to the 4200-SCS
Complete Reference, ZTEC User's Manual, Chapter 2.

Ground unit (GNDU)

Basic characteristics

The ground unit (see
measurement ground signal shared by all installed 4200-SCS instrumentation. In addition, the
GNDU SENSE terminal provides access to the SMU SENSE LO signals.
Figure 1-26
Ground unit
Basic ground unit characteristics are summarized in

Basic circuit configurations

Ground unit connections

Figure 1-27
GNDU FORCE signal is circuit COMMON. The GNDU SENSE terminal is connected to each SMU
SENSE LO signal through a unique auto-sense resistor.
When the GNDU SENSE signal is connected to a DUT, all measurements will be made relative to
this DUT connection.
1-32
Figure 1-26) provides convenient access to circuit COMMON, which is the
S
E
N
S
E
F
O
R
C
E
C
O
M
M
O
N
Table 1-4
Basic ground unit characteristics
Characteristic
Maximum current (FORCE triax connector)
Maximum current (COMMON binding post connector)
Maximum FORCE path/cable resistance
Maximum SENSE path/cable resistance
shows how the various GNDU signals are related to the SMU signals. Note that the
Return to
GNDU
Table
Section Topics
Model 4200-SCS User's Manual
1-4.
Description
2.6 A
9 A
1 Ω
10 Ω
4200-900-01 Rev. K / February 2017