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Brief specs are on page 182 of the 1970 catalog you can download from www.hparchive.com .
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Log converters are great for measuring voltages with a large dynamic range. HP grouped them as accessories to their Recording and Data Acquisition product lines - to keep the pen from going off the chart. Log converters of this era used the exponential I-V characteristic of diode and transistor junctions to get the logarithmic response. These have a large temperature coefficient and must be ovenized if you want any kind of accuracy. I have an earlier instrument, the Moseley 60D, but I haven't worked on it yet. Dave Wise -----Original Message----- |
