ETS-Lindgren FP2083 Isotropic Electric Field Probes (Archived) - Manual (Page 19)

Isotropic Electric Field Probes
HI-4453/FP5083/FP4083/FP2083
© ETS-LINDGREN L.P. – June 2005
Rev. F, P# H-600064 19
APPLICATION CONSIDERATIONS
The following subsections contain information designed to help
you maximize the effectiveness of the HI-
4453/FP5083/FP4083/FP2083.
Out-of-Band Considerations
Although the HI-4453/FP5083/FP4083/FP2083 is nominally
rated for operation from 80 MHz to 40 GHz, it responds to
signals both above and below these frequencies. Such
responses must be taken into account when performing certain
operations, such as zeroing.
On the lower end, the HI-4453/FP5083/FP4083/FP2083 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.
Archived 4/2/10