Keithley 4200-SCS User Manual

4200-900-01 Rev. K / February 2017 Return to Section Topics 1-17
Model 4200-SCS User’s Manual Section 1: Getting Started
Most common causes of ABB not locked are:
• Mismatched physical cable lengths
• Mismatched physical cable lengths versus the programmed cable length in Keithley
Interactive Test Environment (KITE)
• Improperly torqued SMA cables
• Sub-optimal I-range setting
• Too much parasitic load on the low side of DUT
Figure 1-12
Measurement circuit (simplified)
The capacitive impedance (and conductance) are calculated based on the measured AC
impedance and phase.
The capacitance is calculated from the capacitive impedance and the test frequency using the
following formula:
Measurement functions
The 4210-CVU can measure the following parameters:
• Z, Theta Impedance and Phase Angle
• R + jX Resistance and Reactance
• Cp-Gp Parallel Capacitance and Conductance
• Cs-Rs Series Capacitance and Conductance
• Cp-D Parallel Capacitance and Dissipation Factor
• Cs-D Series Capacitance and Dissipation Factor
Figure 1-13 shows the vector diagram and fundamental equations for impedance.
AC
Test
Signal
DC
Bias
4200-CVU
HCUR
Measure
AC Current
HPOT
Measure
AC Voltage
V
LPOT
A
LCUR
DUT
ABB Loop
I
DUT
Red SMA
Cable (1 of 4)*
Shields of the cables must
be connected together near
the DUT.
*
C
DUT
I
DUT
2πfV
AC
--------------------=
C
DUT
= Capacitance of the DUT (f)
f = Test frequency (Hz)
V
AC
= Measured AC voltage (V)

Keithley 4200-SCS Specifications

General

Brand	Keithley
Model	4200-SCS
Category	Semiconductors
Language	English