Electronic Fluxmeter EF 14
Fig. 4.9.1: Coil menu
In the Coil menu the data of measuring coils that have not an own data memory (EEPROM)
can be entered. If you are using a measuring coil with an own data memory all the necessary
settings are done automatically. (The parameters can also be changed if a coil with incorporated
EEPROM is used, however, the changes are only kept in memory until the instrument is
switched off or the coil is disconnected).
The following parameters can be entered or selected:
the coil type Coil,
the coil constant k,
the coil resistance R,
the identification number of the coil ID.
Due to the high input resistance of the EF 14 of 100 k the resistance of the measuring coil can
be often neglected and simply set to zero. If it is not small compared to 100 k, the real
resistance must be entered. It can be taken from the label of the coil or measured using an
ohmmeter.
The coil constant is only then required if a unit other than Volt seconds, Weber or Maxwell is
selected.
The following coil type selections are possible:
Field Coil for field strength measuring coils (search coils, FS, DFS…)
and point measuring coils (PKS...)
Surrounding Coil for surrounding coils (J...)
Moment Coil for magnetic moment measuring coils (MS...), e.g.
Helmholtz coils and for Saturation Coils (JS…)
Potential Coil for magnetic potential measuring coils (PS…)
Pole Coil for pole coils (P...)
Flux Etalon for flux reference standards (FE…)
Integrator Mode for all coils
In the Integrator Mode the EF 14 ignores the input values for the coil constant as well as the
coil resistance. The integrator mode is especially for compatibility with older fluxmeters.
Eventually required calculation must be carried out manually in Integrator Mode. Take into
account that the input resistance of the EF 14 is 100 k. In the Integrator Mode a voltage of
1 mV at the analog output corresponds to 1 digit in the display.
The coil constants are:
for field measuring coils or point coils: the area turns or winding area (in cm²), i.e. the
number of turns multiplied by the average cross-
sectional area
for surrounding coils: the number of turns
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