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Chapter 4 47
ENR File Format
Format Details
comments or header fields as ENR data. ENR data has the general form:
Freq [Funit] ENR [Eunit] [Euncert [on_mag on_phase
off_mag off_phase [Runcert]]]
Note that the square brackets denote optional fields.
Field separator
Each field is separated by whitespace. A single ’,’ is allowed within or
instead of the whitespace.
Numeric fields With the exception of the two optional unit fields, the other fields are
numeric. Numbers are formatted as an optional sign, followed by a
sequence of one or more digits (which can include a single decimal point
within the sequence), followed by an optional exponent. The exponent
consists of the ’e’ or ’E’ followed by an optional sign followed by between
one and three digits.
Frequency fields The frequency field (
Freq
) is the frequency at which the ENR amplitude
was measured.
The frequency unit field (
Funit
) is optional. The default unit is Hz.
Valid units are Hz, kHz, MHz, GHz, THz. Units are not case sensitive.
ENR fields The ENR amplitude (
ENR
) is the measured ENR at the specified
frequency.
The ENR unit field (
Eunit
) is optional. The default unit is dB. Currently,
the only allowed unit is dB. Note that units K, C, F (temperature) are
reserved for possible future use, but are not supported by the Noise
Figure Analyzer at this time.
The uncertainty field for the ENR amplitude (
Euncert
) is optional.
However, this field must be present if reflection coefficient data is
supplied.