User Manual

13-8 Digital I/O Port, Output Enable, & Output Configuration 2400 Series SourceMeter
®
User’s Manual
Configure OUTPUT menu
Press CONFIG and then ON/OFF OUTPUT to display the menu. Figure 13-5
shows the overall menu structure.
NOTE For the Model 2430 Pulse Mode, ENABLE is the only menu item that is
displayed. For the Pulse Mode, the output-off state is always set to
NORMAL, and auto output-off is always enabled.
• ENABLE — Use to ENABLE or DISABLE the output enable line of the Digital
output. This line is used as an output enable for a test fixture. See
“Digital I/O
port,” page 13-2.
• OFF STATE — Use to select the OFF state of the output. See “Output-off
states,” page 13-9, for details.
– HIGH IMPEDANCE — When the OUTPUT is turned OFF, the output
relay opens. This disconnects external circuitry from the input/output of
the SourceMeter.
– NORMAL — When the OUTPUT is turned off, the V-Source is selected
and set to 0V. Current compliance is set to 0.5% full scale of the
present current range.
– ZERO — When the V-Source OUTPUT is turned off, the V-Source is
set to 0V and current compliance is not changed. When the I-Source
OUTPUT is turned off, the V-Source mode is selected and set to 0V.
Current compliance is set to the programmed Source I value or to 0.5%
full scale of the present current range, whichever is greater. Measure
-
ments are performed and displayed while the OUTPUT is off.
– GUARD — When OUTPUT is turned OFF, the current source is
selected and set to 0A. Voltage compliance is set to 0.5% full scale of
the present voltage range.
• AUTO OFF — Use to ENABLE or DISABLE auto output off. When enabled,
the OUTPUT will turn off after the measurement phase of every SDM cycle.
The OUTPUT turns back on at the beginning of the next SDM cycle. When
disabled, the OUTPUT stays on as long as the SourceMeter is operating
within the trigger model (ARM annunciator on). With the OUTPUT enabled,
pressing the ON/OFF key will disable the OUTPUT and disable auto output
off.
NOTE Enabling auto output off with auto zero turned off may result in readings
that are not fully settled because the source may not have settled when
the A/D signal phase measurement is taken. Turning auto zero on may
improve the readings because it adds a 450µs delay after the output is
turned on, but before the A/D measurement is taken. If the readings have
not settled, it will be necessary to increase the source delay.