Introduction 1U1461A/U1453A User’s Guide 35KeypadThe operation of each key is explained in Table 1-4 below. Pressing a key enablesa function, displays a related symbol, and emits a beep. Turning the rotary switchto another position resets the current operation of the key.U1461A U1453ATable 1-4 U1461A/U1453A keypad functionsLegend Function when pressed for:Less than 1 second More than 1 secondInsulation Resistance (IR) Test: Initiates an IR test (when the rotary switch is in one of the Ω Megapositions) as long as is held — the tester sources (outputs) a high voltage and measuresinsulation resistance and is shown on the display.Earth-Bond Resistance (EBR) Test: Initiates an EBR test (when the rotary switch is in the Ω EBposition) as long as is held — the tester measures earth-bond resistance and isshown on the display.Trig Hold: Freezes the present reading in thedisplay (except when the rotary switch is in one ofthe Ω Mega positions or in the Ω EB position).– In TrigHold mode, press to manuallytrigger the holding of the next measured value.– Press and hold again to exit thismode.Auto Hold: Automatically freezes the presentreading once the reading is stable (except whenthe rotary switch is in one of the Ω Mega positionsor in the Ω EB position).– In AutoHold mode, the reading is updatedautomatically once the reading is stable andthe count setting is exceeded.– Press and hold again to exit thismode.
