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DDC112 Electrometer

DDC112 Electrometer. 13 Feb 2013 D. Peterson. DDC112 Internals. DDC112 Implementation. Pulse out every 1nC. Full scale internal reading is 350 pC in 20 bits. Cycle time is about 600 uS . Max input rate is 583 nA. Max output rate is 70 pulses/sec * 1nC/pulse = 70 nA.

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DDC112 Electrometer

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  1. DDC112Electrometer 13 Feb 2013 D. Peterson

  2. DDC112 Internals

  3. DDC112 Implementation • Pulse out every 1nC. • Full scale internal reading is 350 pC in 20 bits. • Cycle time is about 600 uS. • Max input rate is 583 nA. • Max output rate is 70 pulses/sec * 1nC/pulse = 70 nA. • 32 bit accumulator of 20 bit values. Saturates at about 1.43 uC. Takes about 20 sec to dump that at 70 Hz.

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