diode readings

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can anyone tell me why this is happening:

i thought a diode was bad because when i measured it in the circuit, one reading was 700 ohms (good) and 1400 ohms the other way (bad) shouldn't it be infinity?

so i replaced it with another that i measured 700 ohms one way and infinity the other, and when i read it in the circuit again, i got 700 and 1400 the other way????

the other channel same component diode reads 700 and infinity ( again, readings with component in the circuit.

something is going on, but i'm not sure what.

any ideas?
thanks,
scott
 
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