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9-8
As shown in
resistor connected to +5V. The output transistor is capable of sinking 250mA from voltages
up to +33V. Each output channel contains a fly-back diode for protection when switching
inductive loads (such as a low power solenoid or relay coils). To use these flyback diodes,
connect the external supply voltage to pin 7 of the digital I/O port. Make sure the external
supply voltage is between +5V and +33V and the current required by the device does not
exceed 250mA.
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An externally powered relay connected to the digital output port is shown in
Other externally powered devices can be similarly connected by replacing the relay with
the device. When the output line is pulled low (0V), the output transistor sinks current
through the external device. In the high state, the output transistor is off (transistor switch
open). This interrupts current flow through the external device.
Figure
9-3, each of the digital, open-collector outputs includes a built-in pull up
On pin 7, do not exceed +33V. For the output lines, do not exceed the
maximum sink current. The maximum sink current for an output line
is 250mA. Exceeding these limits may cause damage to the instrument
that is not covered by the warranty.
®
2790 SourceMeter
Switch System Reference Manual
Figure
9-4.
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