ETS-Lindgren FP5080 Isotropic Electric Field Probe (Archived) - Manual (Page 19)

Isotropic Electric Field Probe
© ETS-Lindgren, June, 2005
Revision F, Part # 600057 19
On the lower end, the HI-4450/FP2080/FP4080/FP5080 can
exhibit significant response to frequencies below 80 MHz. Such
out-of-band responses pose a problem when zeroing the unit,
since that operation obviously assumes a zero field condition. At
the upper end, similar problems can occur. The specified upper
operating limit for this probe is 40 GHz. Above this limit there will
be some response, though it will not be consistent or predictable.
Any probe response to out-of-band frequencies must be
compensated for when zeroing the probe.
RESOLUTION LIMITATIONS
Limitations in probe resolution may result in a non-zero reading
when the receiver is zeroed. If this occurs, it does not
necessarily mean either that there is a problem with the receiver
or that your readings are inaccurate. Receiver linearity is
specified as + 0.5 dB full scale: in addition, the variance of the
A/D converter is + 2 least significant bits. When using the most
sensitive range on a given probe, these specifications create the
possibility that, under zero field conditions, the receiver may
display a non-zero value.
PROBE SUPPORT STRUCTURES
It is very important to keep conductive objects away from the HI-
4450/FP2080/FP4080/FP5080. Any such objects in the
proximity of the probe may distort the field and compromise
measurement accuracy. If your application requires
measurements from a fixed position, always mount the probe on
a non-metallic platform, using non-metallic screws.
Archived 4/02/10