User`s guide

Advanced Source and Measurement Functions 6
Model N6705 User’s Guide 161
Output Bandwidth
Agilent Models N678xA SMU have several voltage bandwidth modes
that let you optimize output response time with capacitive loads.
The Low bandwidth setting provides stability with a wide range of
load capacitors. Additional bandwidth modes provide faster output
response when the load capacitance is restricted to smaller ranges.
If capacitive loads cause the output to oscillate on the default (Low
bandwidth) or any of the other bandwidth settings, a protection
function will detect the oscillation and latch the output off. The
condition is annunciated by the OSC status bit. At power-on the
oscillation protection function is enabled.
From the front panel:
Press the Settings key to access the Source Settings window.
Navigate to and select Advanced.
Select a bandwidth according to the following load capacitances and
load lead lengths:
Setting
Load
Capacitance
Sensing Maximum distance from
sense point to load capacitor
ESR
@100 kHz
Low
0–150 μF
Local or remote
Full lead length (see chapter 2)
50 to 200 mΩ
High1
0–1 μF
Remote only
6 inches (15 cm)
50 to 200 mΩ
High2
1–7 μF
Remote only
6 inches (15 cm)
50 to 200 mΩ
High3
7–150 μF
Remote only
6 inches (15 cm)
50 to 200 mΩ
See Chapter 2 under “Agilent N678xA SMU Wiring Requirements” for
additional information on allowable load lead lengths.
NOTE
Connecting capacitive loads that fall outside the indicated ranges may result in
output instability or oscillation, and cause the output to turn off,
setting the OSC
status bit.
From the remote interface:
The compensation function is set using the following SCPI command::
[SOURce:]VOLTage:BWIDth LOW | HIGH1 | HIGH2 | HIGH3, (@1)
When queried, the returned value is the bandwidth that was selected.