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

8-2 3700AS-901-01 Rev. D/June 2018

Figure 101: Rear panel to backplane to DMM connect relays schematic

Line cycle synchronization

Synchronizing A/D conversions with the frequency of the power line increases common mode and

normal mode noise rejection. When line cycle synchronization is enabled, the measurement is

initiated at the first positive-going zero crossing of the power line cycle after the trigger.

The following figure shows a measurement process that consists of two A/D conversions. If the

trigger occurs during the positive cycle of the power line (Trigger #1), the A/D conversion starts with

the positive-going zero crossing of the power line cycle. If the next trigger (Trigger #2) occurs during

the negative cycle, then the measurement process also starts with the positive-going zero crossing.

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