Electronic Fluxmeter EF 14
for moment measuring coils: the measuring constant (in cm)
for potential measuring coils: the measuring constant (in kA/Vs)
for pole coils: the area turns or winding area (in cm²)
for flux reference standards: any, not required for measurements in Vs
Numerical values are entered using the numerical keypad.
To delete a digit the cursor is placed with the arrow keys on the respective digit and the Delete
key is pressed.
If you own measuring coils with bunch or banana plugs or if you design your own measuring
coils, you can connect them to the pole clamps on the rear panel of the EF 14. If you prefer a
connection to the front side socket, you can find the pole configuration in chapter 7.1.
If your coil was calibrated by the calibration laboratory for magnetic measurands of Magnet-
Physik, you can find all necessary coil data in the calibration certificate. Select the coil type and
enter coil constant and resistance to the EF 14.
For other Magnet-Physik coils with bunch plugs the coil data can be obtained as follows:
for field measuring coils FS 100, FS 100 C, FS 1000, DFS etc. and point coils PKS 3, PKS 5
etc.:
Older coils of these types show on the coil label the virtual area turns NA
10 kΩ
if the coil is
connected to a fluxmeter with an input resistance of 10 kΩ. As the EF 14 has an input
resistance of 100 kΩ, the coil constant must be converted. The real area turns NA are
obtained from the virtual area turns by
kΩ10
kΩ10
1 NA
R
NA
,
where R is the coil resistance that should be measured using an ohmmeter.
Example: A coil FS 100/2 has virtual area turns of NA
10 kΩ
= 100 cm² and a resistance of R =
220 Ω. The real area turns are
cm²2.102²cm100022.1cm²100
kΩ10
220
1
NA
.
These area turns, which are the coil constant k in this case, and the resistance R shall be input
in the coil menu of the EF 14.
for the potential coil PS 150:
The constant of 1·10
6
A/Vs = 1000 kA/Vs that is given on the coil label is a virtual constant
for the case that the coil is connected to the 0 Ω-Input of a fluxmeter that normally has an
input resistance of 10 kΩ. The real coil constant k must be calculated from
kA/Vs1000
kΩ10
k
,
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