One of the SR560's I was using to AC couple my nice new temperature sensors is...broken? It's output goes from tiny to railed with a 50 Ohm on the input when switching to a gain of 50. It takes a while to come down off the rail after reseting it. I don't trust its output.
I nicked what looked like a spare SR560 from the TCS lab. Settings when I turned it on were DC coupled, 3 Hz low pass single pole, gain = 20.