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Model 2790 SourceMeter Switch System Reference Manual
Figure 9-4
Controlling externally powered relays
33V
Digital Output #1
Flyback Diode
Control
Line
Equivalent Circuit
Flyback
Diode
Source mode — logic control
The digital outputs can be used as logic inputs to active TTL, low-power TTL, or CMOS
inputs. For this mode of operation, the output lines can source up to 200µA.
Model 2790
+5V
4.75kΩ
Pull Up Resistor
+
-
Relay
Coil
Transistor Switch
Pin 7 - Diode Clamp
Digital Output
Pin 9 - Digital Ground
External Power
(+5V to +33V)
Relay
Coil
+
External Power
(+5V to +33V)
-
9-9
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