L3Harris narda PMM EP-600 User Manual page 15

1.1 Documentation
1.2 Diode-based
isotropic electric
field probes
1
Document EP60XEN-01122-3.16 – © NARDA 2020
1 – General
This Manual includes:
• Questionnaire to resend together with the instrument to service.
• Check list of supplied accessories.
This type of probes are made by small antennas terminated on multiple
diodes. To ensure optimal isotropy, the antenna elements are configured
orthogonally in order to add all of the electromagnetic wave components.
They measure the field independently from field polarization and direction.
The diodes feature linear and quadratic responses to level variations.
At low levels of field the output voltages are proportional to the square
value of the field (E²) i.e. to the RMS value.
At higher field levels, up to the saturation, the response becomes linear,
thus the output voltages are proportional to the peak value of the field.
The calibration is performed in terms of RMS value in both cases, therefore
modulated sources may require a proper correction factor to be taken into
account.
General Information 1-1