Line cycle synchronization
Using line synchronization helps increase common-mode and normal-mode noise rejection. When
line cycle synchronization is enabled, measurements are initiated at the first positive-going zero
crossing of the power line cycle after the trigger.
Line cycle synchronization only applies to the following DMM functions:
• Commonside ohms
• Continuity
• DC current
• DC volts
• Four wire ohms
• Temperature
• Two wire ohms
Line synchronization can be enabled for NPLC measurements, increasing the normal-mode rejection
ratio (NMRR) and common-mode rejection ratio (CMRR).
To set line synchronization from the front panel for the selected function:
1. Press the CONFIG key.
2. Press the DMM key.
3. Use the navigation wheel to select LINESYNC.
4. Select:
▪ OFF to disable line synchronization
▪ ON to enable line synchronization
5. Press the navigation wheel or ENTER to save the setting for the selected function.
To set line synchronization remotely, see dmm.linesync (on page 11-195).
Autodelay
Autodelay applies a wait period at the start of measurement. The delay allows cables, Series 3700A
cards, or internal DMM circuitry to settle for best measurement accuracy. For the AC current and AC
volts functions, the autodelay includes both the RMS filter and AC coupling capacitor settling times.
When autodelay is disabled, no wait time is applied. When autodelay is enabled, every start of
measurement for a function is delayed by the same amount of time.
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