For consistency, today, I measured both the BS and PRM actuator balancing using the same technique and don't find as serious an imbalance for the BS as in the PRM case. The Oplev laser source is common for both BS and PRM, but the QPDs are of course distinct.
BTW, I thought the expected resistance of the coil windings of the OSEM is ~13 ohms, while the BS/PRM OSEMs report ~1-2 ohms. Is this okay?
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- All the PRM coils look well-matched in terms of the inductance. Also, I didn't find a significant difference from BS coils.
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