Op-Amp tester on LM4250
Based on the datasheet for the LM4250 that I found here the LM4250 seems to have the same pinout as the LM741 with the exception of pin 8, which is the "Quiescent Current Set" for the LM4250 and "NC" for the LM741. To quote the datasheet, the op amp uses: 


  A single external master bias current setting resistor programs the input bias current, input offset current, quiescent power consumption, slew rate, input noise, and the gain-bandwidth product. 


So it's my understanding that pin 8 is used to adjust the quiescent current through the differential pair and output stage of the op amp. Looking at this application report for the LM4250, it seems like it requires at least a resistor connected from pin 8 to ground or V- to be operational, but there are multiple other biasing methods shown on page 5 &amp; 6. Thus if pin 8 is left floating, the biasing current for the internal differential pair will not be set properly.

Moving forward, looking at Figure 10 on page 9 of the application report I mentioned previously, using a resistor upwards of 12MOhms connected from pin 8 to ground (you may need to pick a different value based on your needs) should provide a good enough bias current for testing the op amp.

I personally do not have much experience with programmable op amps but if anyone does, please correct me if I've provided any wrong information.