N4374B datasheet(5/18 Pages) HP

5 / 18 page

Deﬁnitions

Generally, all speciﬁcations are valid at the stated operat-

ing and measurement conditions and settings, with uninter-

rupted line voltage.

Speciﬁcations (guaranteed)

Describes warranted product performance that is valid under

the speciﬁed conditions.

Speciﬁcations include guard bands to account for the ex-

pected statistical performance distribution, measurement

uncertainties changes in performance due to environmental

changes and aging of components.

Typical values (characteristics)

Characteristics describe the product performance that is

usually met but not guaranteed. Typical values are based on

data from a representative set of instruments.

General characteristics

Give additional information for using the instrument. These

are general descriptive terms that do not imply a level of

performance.

Explanation of terms

Responsivity

For electro-optical devices (e.g. modulators ) this describes

the ratio of the optical modulated output signal amplitude

compared to the RF input amplitude of the device.

For opto-electrical devices (e.g. photodiodes) this describes

the ratio of at the RF amplitude at the device output to the

amplitude of the modulated optical signal input. .

Relative frequency response uncertainty

Describes the maximum deviation of the shape of a mea-

sured trace from the (unknown) real trace. This speciﬁcation

has strong inﬂuence on the accuracy of the 3-dB cut-off fre-

quency determined for the device under test.

Absolute frequency response uncertainty

Describes the maximum difference between any amplitude

point of the measured trace and the (unknown) real value.

This speciﬁcation is useful to determine the absolute re-

sponsivity of the device versus modulation frequency.

Frequency response repeatability

Describes the deviation of repeated measurement without

changing any parameter or connection relative to the aver-

age of this measurements.

Minimum measurable frequency response

Describes the average measured responsivity when no mod-

ulation signal is present at the device under test. This repre-

sents the noise ﬂoor of the measurement system.

LCA electrical port B

LCA optical input

LCA optical output

LCA electrical port A

Deﬁnition of LCA input and output names

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