ETS-Lindgren FP5000 Isotropic Electric Field Probe (Archived) - Manual (Page 13)

Isotropic Electric Field Probe
HI-4422/FP2000/FP4000/FP5000
© ETS-LINDGREN L.P. – July, 2005
Revision G- Part # H-600054 13
3.0 OPERATION
This section discusses the theory of operation and the functions
of the HI-4422/FP2000/FP4000/FP5000 Isotropic Electric Field
Probe. A high-level block diagram (Figure 4) is included to aid
the discussion. The objective is to provide information that
enhances the user's understanding of the design of this probe.
SYSTEM THEORY
The HI-4422/FP2000/FP4000/FP5000 Isotropic Electric Field
Probe utilizes a microprocessor for intelligent operation and
control. The probe's self-contained power supply employs a 3.6
VDC NiCd battery, which provides up to 40 hours of continuous
operation.
For each axis, the probe measures the radio frequency signal
level and generates a linearized reading of the measurement. A
vector addition is performed on these three readings: the
resultant is transmitted to the receiver over glass fiber optic
cables. The probe provides data to the readout via either a short
form or long form output word. See Appendix B for details on
both output word formats.
PROBE OPERATION
Receiver commands to the probe consist of the following:
! Send reading
! Read battery voltage
! Zero
! Set sleep timer
! Change range
! Read temperature
! Enable/disable axis
The signal flow within the probe is shown in the block diagram.
Archived 4/2/10