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Definitions and test conditions
Specifications describe the instrument's warranted
performance after a half-hour warm-up and over the
temperature range of 25 ˚C ± 5 ˚C, unless otherwise
stated. Specifications for frequencies above 3 GHz do
not apply to instruments with Option 075 (75-ohm
impedance).
Supplemental characteristics are typical but non-war-
ranted performance parameters. These are denoted as
“typical,” “nominal,” or “approximate.”
The measurement uncertainty curves and measure-
ment port characteristics given for HP 8753ES
systems also apply to the HP 8753ES with Options 006
and 011 and the HP 85047A test set (50-ohm), or the
HP 8753ES Option 011 with an HP 85046B test set
(75-ohm).
Dynamic range
System dynamic range is calculated as the difference
between the receiver noise floor and the lesser of
either the source maximum output or the receiver
maximum input level. System dynamic range applies to
transmission measurements only, since reflection mea-
surements are limited by directivity.
Noise floor is specified as the mean of the noise trace
over frequency. Noise floor is measured with the test
ports terminated in loads, full two-port error correc-
tion for the HP 8753ES and enhanced-response error
correction for the HP 8753ET (with 16 averages used
during isolation), 10 Hz IF bandwidth (BW), maximum
test port power, and no averaging during the measure-
ment.
Measurement uncertainty
Measurement uncertainty curves utilize a Root Sum
Square (RSS) model for the contribution of random
errors such as noise, typical connector repeatabilities,
and test set switching; this is combined with a worst-
case model for the contributions of dynamic accuracy
and residual systematic errors.
Curves show the worst-case magnitude and phase
uncertainty for reflection and transmission measure-
ments, after a full two-port error correction for the
HP 8753ES and enhanced-response error correction
for the HP 8753ET (including isolation with an averag-
ing factor of 16) using the specified cal kit, with 10 Hz
IF bandwidth (BW) and no averaging.
Measurement port characteristics
Characteristics show the residual system uncertainties
for uncorrected performance and after accuracy
enhancement using full two-port error correction for
the HP 8753ES and enhanced-response error correc-
tion for the HP 8753ET. These characteristics apply
for an environmental temperature of 25 ± 5 ˚C, with
less than 1 ˚C deviation from the calibration tempera-
ture. HP 8753ET Option 004 may degrade transmission
source match as much as 2 dB, resulting in up to 0.05
dB additional uncertainty in transmission tracking.
Corrected performance indicates residual error after
calibration. It is determined by the quality of calibra-
tion standards, system repeatability, stability, and
noise.
Uncorrected performance indicates intrinsic errors
without calibration correction applied. This is related
to the ultimate stability of a calibration.