Name: Keithley 3706A
Brand: Keithley
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Section 8: Theory of operation Series 3700A System Switch/Multimeter Reference Manual

8-4 3700AS-901-01 Rev. D/June 2018

Figure 104: 1plc Line Sychronization Block Diagram

For Line Synchronization off and <1 PLC, reading rate increases, but measurement uncertainty and

noise increases due to the Average AC noise during the S HI phase not canceling with the S LO

phase. With line synchronization ON, the S HI and S LO measurement phases are triggered at the

rising edge of the power line zero crossing. This improves reading uncertainty and noise by >30×

while minimal reading rate reduction.

Figure 105: Line Sync Off and On <1plc

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