User`s guide

Operating the Power System 4
Series N6700 User’s Guide 67
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.
Select a bandwidth according to the following output capacitances
and lead lengths:
Setting Output
Capacitance
Sensing Maximum distance from
sense point to 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 (155 mm) 50 to 200 mΩ
High2
1–7 μF
Remote only 6 inches (155 mm) 50 to 200 mΩ
High3
7–150 μF
Remote only
6 inches (155 mm)
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 may cause the output to turn
off, setting the
OSC status bit.
Front Panel: SCPI Command:
Select
Output\Advanced\Bandwidth.
Select a bandwidth from the
selections listed and press Select.
To select the bandwidth:
VOLT:BWID HIGH1,(@1)
Set the Output Turn-Off Mode
NOTE
This information applies to Agilent Models N678xA SMU only.
This lets you specify high impedance or low impedance mode at
output turn-on and turn-off.
Low impedance - At turn-on the output relays are closed after which
the output is programmed to the set value. At turn-off the output is
first programmed to zero, after which the output relays are opened.
High impedance – At turn-on the output is programmed to the set
value after which the output relays are closed. At turn-off the output
relays are opened while the output remains at its set value. This
reduces current pulses that may be undesirable in some applications.
Front Panel: SCPI Command:
Select Output\Advanced\Tmode.
Select either High Impedance or
Low impedance and press Select.
To set output 1 to a high impedance
mode:
OUTP:TMOD HIGHZ,(@1)