3 Making Measurements74 Keysight U1401B User’s and Service GuideRefresh hold (auto trigger)The refresh hold mode freezes the displayed value until the reading variationexceeds the specified number of counts.This function will autotrigger and update the held value with a new measuredvalue. When a new value is updated, the instrument will beep once as anotification. The keypad operation is similar to the operation of data hold mode.1 Make sure the refresh hold mode is enabled in the setup mode.2 Press to enter the refresh hold mode.– The present value will be held and the DH annunciator will appear on thedisplay.– It will be ready to hold the new measured value once the variation of theinstantaneous reading exceeds the preset variation count (defined in setupmode); while it waits for a stable new reading, the DH annunciator willflash.– The DH annunciator will stop flashing once a stable new reading isavailable, and then the new value will be updated to the display. Theinstrument will beep once as a notification.3 Press to exit this mode.For voltage and current measurements, the held value will not be updated if thevariation of the reading is below 500 counts. For resistance and diodemeasurements, the held value will not be updated if the reading is OL or open. Forall measurements, the held value will not be updated if the reading cannot reach astable state.
