J.P. Instruments EDM 930 Primary Pilots Guide - Manual (Page 52)

For Your Safe Flight Page 47
WARNING:

Never add or remove fuel from the aircraft when the master
switch is turned on.

Fuel quantity gauge performance is affected by many factors,
such as the integrity of the sensor performance, the accuracy of
the calibration data you collected and entered and most
importantly your validation that the EDM fuel quantity gauge is
accurate and repeatable after installation and calibration. You
should not use the fuel quantity gauge system for any flight
related operations until this validation criteria has been met.
Section 11 - Setting Fuel Calibration Points
The EDM interfaces to various fuel level sensor types to facilitate direct
reading of the fuel level in the aircraft fuel tanks. The EDM has a multi-
point fuel calibration table that you must enter. This table contains
calibration values (stored in non-volatile memory) used to translate
sensor readings into the displayed fuel quantity values. The calibration
information is collected and recorded on paper for later entry into the
EDM. NOTE: Fuel quantity gauges will not be functional until the fuel
calibration information has been entered into the EDM. You will use the
EDM instrument itself as the measuring device to collect calibration
data. Refer to Installation Manual Report 908 for expanded information
on fuel level system implementation.
The following describes the basic procedures necessary for collection
and entry of data into the fuel level calibration table. Note: Any changes
to fuel table data will be temporary until you execute the ’SAVE’
function (available after last cell of the last tank table is entered).
Before beginning the fuel table entry/edit process, you must have
properly installed and tested for correct functionality of the fuel sensors.