CALCulate:Uncertainty Commands

(Write-Read) Sets and returns the display type for uncertainties for the selected measurement trace.

See Critical Note

Parameters

<ch>

Channel number of the measurement to display uncertainties. If unspecified, value is set to 1.

<char>

Display type. Choose from:

NONE - Display the trace without uncertainties.

MAXimum – Display the trace as the uncertainty maximum (measured or memory data + upper limit uncertainty values).  Not supported with Smith Chart or Polar display format.

MINimum - Display the trace as the uncertainty minimum (measured or memory data - lower limit uncertainty values).  Not supported with Smith Chart or Polar display format.

BAR – Display the uncertainties as “error bars” around the trace.  Not supported with Smith Chart or Polar display format.

SHADe – Display the uncertainties as a shaded region around the trace.  Not supported with Smith Chart or Polar display format.

ELLipse – Display the uncertainties in ellipse form.  Supported only in Smith Chart or Polar display format.

Examples

CALC1:UNC:DISP:TYPE BAR

Query Syntax

CALCulate<ch>:UNCertainty:DISPlay:TYPE?

Return Type

Character

Default

NONE

(Write-Read) Sets and returns the coverage factor (sigma) value to apply to the displayed uncertainty for the selected measurement trace. Coverage Factor corresponds to the level of confidence used in computing the specified measurement uncertainties.

See Critical Note

Parameters

<ch>

Channel number of the measurement to display uncertainties. If unspecified, value is set to 1.

<value>

Integer. Choose from:

Examples

CALC1:UNC:DISP:CFAC 2

Query Syntax

CALCulate<ch>:UNCertainty:DISPlay:CFACtor?

Return Type

Numeric

Default

2

(Write-Read) Sets and returns whether the cable/connection repeatability contribution is currently included in the uncertainty values for the selected measurement trace.

See Critical Note

Parameters

<ch>

Channel number of the measurement to display uncertainties. If unspecified, value is set to 1.

<bool>

Choose from:

OFF (or 0) - Cable repeatability is NOT included.

ON (or 1) - Cable repeatability IS included.

Examples

CALC1:UNC:MODE:CABL:REP ON

Query Syntax

CALCulate<ch>:UNCertainty:MODE:CABLe:REPeat?

Return Type

Boolean

Default

ON

(Write-Read) Sets and returns whether the noise contribution is currently included in the uncertainty values for the selected measurement trace.

See Critical Note

Parameters

<ch>

Channel number of the measurement to display uncertainties. If unspecified, value is set to 1.

<bool>

Choose from:

OFF (or 0) - Noise contribution is NOT included.

ON (or 1) - Noise contribution IS included.

Examples

CALC1:UNC:MOD:NOIS ON

Query Syntax

CALCulate<ch>:UNCertainty:MODE:NOISe?

Return Type

Boolean

Default

ON

(Write-Read) Sets and returns whether the uncertainties associated with the correction error terms are being included in the uncertainty values for the selected measurement trace.

See Critical Note

Parameters

<ch>

Channel number of the measurement to display uncertainties. If unspecified, value is set to 1.

<bool>

Choose from:

OFF (or 0) - Error term uncertainty contribution is NOT included.

ON (or 1) - Error term uncertainty contribution IS included.

Examples

CALC1:UNC:MOD:ETER ON

Query Syntax

CALCulate<ch>:UNCertainty:MODE:ETERm?

Return Type

Boolean

Default

ON

(Write-only) Saves all three uncertainty data formats from the active measurement for the specified ports.

• This command is valid ONLY with Dynamic Uncertainty Calibration applied to the active measurement.

• Data that is not available is zero-filled.

• For sweeps with a large number of data points, always follow this command with *OPC? Learn more.

See Critical Note

Parameters

<ch>

Channel number of the uncertainty measurement. If unspecified, value is set to 1.

<"x,y,z">

String  Comma or space delimited port numbers for which data is requested, enclosed in quotes.

<filename>

String  Path, filename, and suffix of location to store the uncertainty data, enclosed in quotes.  The suffix is not checked for accuracy.

• (*.u*p) S-parameter Uncertainty File - If saving 2 ports, specify "filename.u2p"; If saving 4 ports, specify "filename.u4p.", and so forth.

• (*.dsd) S-parameter Data Standard Definition file - Data for Only one or two ports is allowed.

• (*.sdatcv) METAS S-parameter Covariance File.

Examples

All three examples save the active uncertainty measurement on channel 1

'Saves ports 2 and 3 to .u2p file

CALC1:UNC:SAVE "2,3","C:\myData.u2p"

'Saves ports 1 and 2 to .dsd file

CALC1:UNC:SAVE "1,2","C:\myData.dsd"

'Saves ports 1 through 4 to .sdatcv file

CALC1:UNC:SAVE "1,2,3,4","C:\myData.sdatcv"

Query Syntax

Not Applicable

Default

Not Applicable