Summary: Current Keithley Set the current limit to 2 mA Repeat for all four TTL types Plot VOH vs IOH for all four types on the same graph 3 VOL vs IOL Set up the circuit of Fig 3 Manually set the Keithley 197A to measure current with a range of 200 mA Manually increase the Keithley 230 power supply and observe the output voltage and current Note the power
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