My adalm2000 has LED1 blinking twice a second. Is this the normal condition?

The rapid blinking of LED1 indicates that the device is in programming mode. Since you mentioned that everything is working fine, this behavior is normal. For peace of mind, you may try reflashing the firmware by following this guide: ADALM2000 (M2K) Firmware Updates [Analog Devices Wiki] 

Regards,

Rey

The rapid blinking of LED1 indicates that the device is in programming mode. Since you mentioned that everything is working fine, this behavior is normal. For peace of mind, you may try reflashing the firmware by following this guide: ADALM2000 (M2K) Firmware Updates [Analog Devices Wiki] 

Regards,

Rey

Okay, thanks Rey.

It is not blinking rapidly as in programming mode.

Just twice a second.  But I think I will try a reflash anyway.