L3Harris narda PMM EP-600, User Manual

Page: 40 / 118

3-2 Measurements
3.3 General requirements
The basic components of a field measuring equipment are:
- field probe (field sensor and transducer)
- connecting cables
- metering and data processing equipment
3.3.1 Probes
As a general rule the field probes must respect the following conditions:
•
High rejection to spurious signals
•
No perturbation of the field surrounding the sensors
•
Such connecting cables e.g. fiber optics that do not perturb the field to
measure
•
Known response to the operating ambient
3.3.2 Connections
The connection between field probe and metering equipment transfer the
data relevant to the measurements and the probe/converter settings
without influencing the measure.
Also, unwanted couplings and noise pick-up must be avoided.
Fiber optic connections do perfectly meet the requirements.
3.3.3 Metering equipment
The metering/data processing equipment is designed so that the probe
signals or data are properly read, displayed and stored.
3.4 Basic functional
checks Some basic functional checks are:
- check of the proper probe operation
- check for the readings not varying significantly when rotating the probe
along one of its axis
3.5 Measurement
procedures The measurement procedures must minimize:
•
Risks of exposure of personnel to hazardous electromagnetic fields
•
Measurement errors
•
Interferences
•
Damages to the equipment