CONFigure:COUNter:PERiod
Syntax
CONFigure: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 (this is the reciprocal of the frequency). For period measurements, you must send the [SENSe:]COUNter:INITiate command to initiate the measurement. 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 CONFigure command sets the counter parameters to their default values as shown below.
|
Parameter |
CONFigure 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 = 100 seconds |
1 ms |
|
<ch_list> |
Numeric |
One or more counter channels in the form (@sccc).
|
This is a required parameter |
Remarks
The specified counter channels must detect at least two edges for a valid period measurement.
To read the period, use the [SENSe:]COUNter:DATA? or [SENSe:]COUNter:PERiod[:DATA]? command.
Sending the CONFigure command clears reading memory and resets the triggering system.
Example
The following command configures counter channels 301 and 302 on the module in slot 3 to measure period. The gate time is set to 1 ms.
CONF:COUN:PER
1E-3,(@3301,3302)
COUN:INIT (@3301,3302)
COUN:PER? (@3301,3302)
Typical Response: +2.89400000E-06,+4.83700000E-06