:MEASure:OSCilloscope:TEDGe
Command Syntax
:MEASure:OSCilloscope:TEDGe
Query Syntax
:MEASure:OSCilloscope:TEDGe?
Description
Moves the Time-at-Edge measurement to the top of the Results table. Displays the measurement if it is not already shown on the table. The query form of the command returns the measured value. Time-at-Edge is the measure of the time at which the specified waveform edge occurs on the displayed waveform. To specify the edge, use the NUMBer child commnad. Specify a rising or falling edge with the DIRection command. Specify the edge threshold with the THReshold child command. Sources can be any displayed waveform, waveform memory, or function. For example, CHAN1A, WMEMory1, or FUNCtion1. Use :MEASure:TBASe:METHod to change the definition of the waveform's top/base. Use :MEASure:THReshold:METHod to change the definition of the waveform's threshold.
PAM4 Compatibility. Because this measurement is based on waveform top and base levels and the passing of the waveform's edge through proximal, mesial, and distal thresholds, the measurement is not designed for PAM4 signals. However, the measurement may be able to be made on PAM4 signals if the waveform top and base definitions are manual set. This can be attempted using the following commands: :MEASure:TBASe:METHOd, :CHANnel:UDEFined:TOP, and :CHANnel:UDEFined:BASe commands.
Measurement Ready?
To confirm that the measurement is ready to read, you can query the measurement's status:
if ('CORR' in Flex.query(':MEASure:OSCilloscope:TEDGe:STATus?')):
measurement = Flex.query(':MEASure:OSCilloscope:TEDGe?')
If averaging is turned on (:ACQuire:AVERaging), you can also confirm if the measurement result is ready by comparing the number of specified averages (:ACQuire:ECOunt?) versus the number of measurement sweeps that have occurred (:MEASure:OSCilloscope:TEDGe:COUNt?). The technique uses the :COUNt? common measurement query. For example,
if (Flex.query(':MEASure:OSCilloscope:TEDGe:COUNt?') >= Flex.query(':ACQuire:ECOUNt?')):
measurement = Flex.query(':MEASure:OSCilloscope:TEDGe?')
You can also use an acquisition limit lest to test that a number of waveform samples, or pattern acquisitions have completed before returning a measurement. Refer to the :LTESt:ACQuire:CTYPe command.
Common Measurement Child Queries
This command supports the use of the following common measurement queries: :LOCation?, :COUNt?, :MAXimum?, :MINimum?, :MEAN?, and :SDEViation?.
Measurement Identification
Avoid subtle programming errors! To ensure that the correct measurement is installed or queried, always explicitly identify a measurement when installing a measurement or querying a measured value, status, or detail. To identify a measurement, specify the measurement's source waveform (:SOURce child command). With some measurements, you may also need to specify other identifying values. Generally, when selecting a measurement using FlexDCA's GUI, if a dialog appears prompting you to select values, you should explicitly specify these values when remotely identifying the measurement. More information.
For example, to return the status of the measurement, :MEASure:OSCilloscope:TEDGe:
flex.write(':MEASure:OSCilloscope:TEDGe:SOURce CHAN1A')
if flex.query(':MEASure:OSCilloscope:TEDGe:STATus?') == 'CORR';
measurement = flex.query(':MEASure:OSCilloscope:TEDGe?')
else:
details = flex.query(':MEASure:OSCilloscope:TEDGe:STATus:DETails?')
reason = flex.query(':MEASure:OSCilloscope:TEDGe:STATus:REASon?')
Child commands for measurement identification:
:MEASure:OSCilloscope:TEDGe:SOURce:MEASure:OSCilloscope:TEDGe:NUMBer:MEASure:OSCilloscope:TEDGe:THReshold:MEASure:OSCilloscope:TEDGe:DIRection:MEASure:OSCilloscope:TEDGe:REGion
Example Command Sequence
:SYSTem:MODE OSCilloscope :MEASure:OSCilloscope:TEDGe:SOURce CHAN2B :MEASure:OSCilloscope:TEDGe:DIRection RISing :MEASure:OSCilloscope:TEDGe:NUMBer 2 :MEASure:OSCilloscope:TEDGe:THReshold MIDDle :MEASure:OSCilloscope:TEDGe :MEASure:OSCilloscope:TEDGe?