Products > Test Equipment
Keithley Sourcemeter DIGOUT Protection ?
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JohnPi:
The Keithley Sourcemeters (e.g. 2400) have digital output pins -- DIGOUT. This is shown in the manual as suitable for driving a relay, but no protection against coil inductive spikes is shown. Does it not have protection ? Do I have to add my own diode ?


gamalot:
The diode in the picture (in series with a resistor) is probably what you're expecting, maybe they've drawn the diode's polarity reversed.  :-//

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Sorry I looked again, that diode and resistor should be for pull-up the output.
Kleinstein:
The diode to protect from the inductive kickback of the relay should be at the relay. If in doubt add a 2nd diode - it does not hurt.
JohnPi:
No, that diode is probably to prevent an external > 5 V signal from damaging the internal 5 V supply by pulling it up.

I'll have to add external diodes to clamp the inductance.
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