MEASure:COUNter:PERiod?

34980A

MEASure:COUNter:PERiod?

Syntax

MEASure:COUNter:PERiod? [{<gate_time>|MIN|MAX|DEF},] (@<ch_list>)

Description

This command configures the specified counter channels on the 34950A Digital I/O Module to measure the period of the incoming signal and immediately initiates the measurement (this is the reciprocal of the frequency). The results are sent directly to the instrument's output buffer. The specified gate time is the measurement aperture during which the signal data is gathered. For repetitive signals, longer gate times will lead to increased resolution for frequency, period, pulse width, and duty cycle measurements.

The MEASure? command sets the counter parameters to their default values as shown below.

Parameter

MEASure? Settings

Slope

POSitive (rising edge)

Input Threshold Voltage

2.5V

Gate Source

INTernal

Gate Polarity

NORMal (active high)

Used With:

  • 34950A Digital I/O Module

Parameters

Name

Type

Range of Values

Default Value

<gate_time>

Numeric

Desired gate time between 100 ns and 10 seconds, with 50 ns resolution.

MIN = 100 ns, MAX = 10 seconds

1 ms

<ch_list>

Numeric

One or more counter channels in the form (@sccc).
Select from s301 or s302.

This is a required parameter

Remarks

  • The specified counter channels must detect at least two edges for a valid period measurement.

  • Sending the MEASure? command clears reading memory and resets the triggering system.

Return Format

The command returns the period in seconds for each counter channel specified. The output from this command is affected by the settings of the FORMat:READing commands.

Example

The following command configures counter channel 301 on the module in slot 3 to measure period. The value is transferred to the instrument's output buffer. The gate time is set to 1 ms.

MEAS:COUN:PER? 1E-3,(@3301)

Typical Response:  +2.89400000E-06

See Also

CONFigure:COUNter:PERiod

FORMat:READing