Keithley 4200-SCS Reference Manual page 253

Model 4200-SCS Reference Manual
Current Range combo box
The current Range (measure range) combo box is present for voltage forcing functions only. Here
you specify the measurement range to be used by the SMU for current, from the following options:
Programmed and Measured radio buttons
The current Programmed and Measured radio buttons are present for current forcing functions
only. They specify the current values that are recorded in the Sheet tab Data worksheet, as
follows.
NOTE
Voltage measuring options
Voltage checkbox
Check the Voltage checkbox if you desire the voltage to be recorded in the Sheet tab Data
worksheet and be available for plotting in the Graph tab. If you do not check the Voltage
checkbox, KITE disables voltage measurements for the corresponding device terminal and grays
the voltage measuring options.
Name edit box
In the voltage Name edit box, you can specify a name to be given to the voltage measurement in a
Sheet tab column and, if you plot it, on a Graph tab axis (You can later rename a Graph axis as
desired).
Otherwise, KITE assigns a default name, which is a combination of the terminal label (for example,
Drain, Anode, or (for a capacitor or resistor) A or B) and V for voltage. The following are examples
of default voltage names: DrainV, AnodeV, BV.
4200-901-01 Rev. S / May 2017
• The Auto option commands the SMU to automatically optimize the current measurement
range as stepping/sweeping progresses. This option provides the best resolution when the
measurements span several decades. However, range-change time delays limit the
measurement speed.
• The Limited Auto option is a compromise between the full Auto option and a fixed range
option. Here you can specify the minimum range that the SMU uses when automatically
optimizing the current measurements. This option saves time when you do not need
maximum resolution at minimum currents.
• The Best Fixed option commands the SMU to automatically select a single measurement
range, based on the current compliance.
• The numerical range options allow you to manually select a fixed current measurement
range to suit your needs.
• Clicking the Programmed radio button specifies that the as-requested forced current
values are to be recorded in the Sheet tab Data worksheet. For example, under the
Programmed option, if you specify in a Current Bias window that 10 mA is to be forced at
a transistor collector terminal, the reported value is exactly 10 mA, even if the measured
value would be 9.9982mA.
• Clicking the Measured radio button specifies that the current values to be recorded in the
Sheet tab Data worksheet are actual measured values (by way of the SMU A/D converter).
For example, under the Measured option, if you specify in a Current Bias window that 10
mA is to be forced at a transistor collector terminal, the reported value is 9.9982mA if the
measured value is 9.9982mA.
The Measured mode essentially doubles the measurement time, because of the
need for an extra analog-to-digital (A/D) conversion.
Return to
Section 6: Keithley Interactive Test Environment (KITE)
Section Topics 6-127