Although I don't have the schematic in front of me, I'd agree with the
previous poster that it's probably a -V (voltage) output instead of -I
(current) output. A voltage output is easy to measure with a 'scope, while
a current output is not. I sometimes see the output of an -I with an op-amp
whose output is directly fed back to the unused input, which is a
current-to-voltage converter.
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