Technical data

4-19
Hardkey and Softkey Reference
points allows a faster sweep time but the displayed trace shows less horizontal detail. Using more points gives greater
data density and improved trace resolution, but slows the sweep and requires more memory for error correction or
saving instrument states. The possible values that can be entered for number of points are 3, 11, 26, 51, 101, 201,
401,801, and 1601. The number of points can be different for the two channels if the stimulus values are uncoupled. In
list frequency sweep, the number of points displayed is the total number of frequency points for the defined list (see
“Sweep Types” on page 5-6“).
NUMBER OF READINGS. determines the number of measurement/correction iterations performed on each point in a
power meter calibration. This feature helps eliminate residual power errors after the initial correction. The amount of
residual error is directly proportional to the magnitude of the initial correction. The user should initially set the source
power so that it is approximately correct at the device under test. If power uncertainty at the device under test is
expected to be greater than a few dB, it is recommended that the number of readings be greater than 1.
NUMERATOR: k. is the multiplication constant in the numerator of the response versus frequency coefficient model.
NUMERATOR: DELAY. is a phase or delay factor of the response versus frequency coefficient model. The delay is a
function of frequency.
NUMERATOR: A1. is the first order coefficient in the numerator.
NUMERATOR: A2. is the second order coefficient in the numerator.
NUMERATOR: A3. is the third order coefficient in the numerator.
NUMERATOR: A4. is the fourth order coefficient in the numerator.
OFFSET. selects the calibration standard load as being offset.
OFFSET DELAY. is used to specify the one-way electrical delay from the measurement (reference) plane to the standard,
in seconds (s). (In a transmission standard, offset delay is the delay from plane to plane.) Delay can be calculated from
the precise physical length of the offset, the permittivity constant of the medium, and the speed of light.
OFFSET LENGTH. is used to enter an offset length to adjust the position of the standards to the desired reference plane.
OFFSET LOADS DONE. completes the selection in the Offset Load Menu.
OFFSET LOSS. is used to specify energy loss, due to skin effect, along a one-way length of coax offset. The value of loss
is entered as Ωs/nanosecond (or Giga Ωs/second) at 1 GHz. (Such losses are negligible in waveguide, so enter 0 as the
loss offset.)
OFFSET Z0. is used to specify the characteristic impedance of the coax offset. (Note: This is not the impedance of the
standard itself.) (For waveguide, the offset impedance should always be assigned a value equal to the system Z0.)
OMIT ISOLATION. is used to omit the isolation portion of the calibration.
ONE SWEEP. This mode does not measure each sweep, but corrects each point with the data currently in the power
meter correction table.
OP PARMS (MKRS etc). provides a tabular listing on the analyzer display of the key parameters for both channels. The
screen menu is presented to allow hard copy listings and access new pages of the table. Four pages of information are
supplied. These pages list operating parameters, marker parameters, and system parameters that relate to control of
peripheral devices rather than selection of measurement parameters.
OPEN. defines the standard type as an open, used for calibrating reflection measurements. Opens are assigned a
terminal impedance of infinite Ωs, but delay and loss offsets may still be added.
OPEN (F). for cal kits with different models for male and female test port standards, this selects the open model for a
female test port. Note that the sex of a calibration standard always refers to the test port.
OPEN (M). for cal kits with different models for male and female test port standards, this selects the open model for a
male test port. Note that the sex of a calibration standard always refers to the test port.
OPT. KIT. leads to the optical cal kit menu, which is used to select the default optical cal kit or to modify the cal kit.
P MTR/GPIB TO TITLE. gets data from an GPIB device set to the address at which the analyzer expects to find a power
meter. The data is stored in a title string. The analyzer must be in system controller or pass control mode.
PARALL IN BIT NUMBER. while creating a sequence, this softkey will insert a command that selects the single bit (0 to
4) that a sequence will be looking for from the GPIO bus.
PARALL IN IF BIT H. while creating a sequence, this softkey inserts a command to jump to another sequence if the single
input selected is in a high state.