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Negative to positive TTL signal

2502, 6485, 6487 - Support
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milosbasovic
Posts: 16
Joined: June 23rd, 2014, 6:19 am
Country: United States

Negative to positive TTL signal

Post by milosbasovic » September 3rd, 2014, 7:37 am

Model 6482 is giving an negative TTL signal. What would I need to use to change that signal to positive TTL signal?
The device that I am trying to trigger can only accept following external signal parameters
Low 0V to +0.8V
High +3V to +5V
4ns or wider
1kOhm input impedance

Joseph V
Keithley Applications
Keithley Applications
Posts: 107
Joined: July 1st, 2014, 10:31 am
Country: United States

Re: Negative to positive TTL signal

Post by Joseph V » September 3rd, 2014, 8:32 am

On the TLINK lines the signal goes from High (3.4V typical) to Low (0.25V typical) which would make it appear as if it was giving a negative signal. This can be referenced in the 6482 user manual on page 7-13, the triggering occurs on the falling edge of the signal which is why it is done this way.

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