Teledyne-lecroy PeRT3 Software Interface Manuel d'utilisateur télécharger pdf (Page 11)

How does LCPeRT_GetStats or LCPeRT_GetChannelStats work?

Call LCPeRT_GetStats() or LCPeRT_GetChnlStats() after LCPeRT_Run() returns or after calling

LCPeRT_Stop() to get the final results, or after LCPeRT_Start() to get intermediate results.

Miscellaneous

What units are used?

Units are documented in the LCPeRT.h header file. They are basically the same as the units displayed in

the user interface.

Do you have a sample Python script using Python ctypes facility?

from LCPeRT import LCPeRTSession

def main():

# Establish a session with the PeRT.

pert = LCPeRTSession(address="127.0.0.1")

# Configure the SerDes protocol ("CUSTOM", in this case) and

# the bit rate (3 GB/sec).

pert.configure_pert("CUSTOM", 3000)

# Connect to the DUT.

pert.connect_to_dut()

# Get the string identifier of channel 1. (The value will be "CH1").

ch1 = pert.get_channel_name(1)

# Set several stress parameters.

pert.set_low_freq_random_jitter(ch1, 10.0)

pert.set_high_freq_random_jitter(ch1, 10.0)

pert.set_periodic_jitter_frequency(ch1, 10.0e6)

# Set the termination condition for the test.

# For this example, just count errors for a fixed amount of time.

pert.set_termination_on_elapsed_time(ch1, 100.0)

# Run a test for several values of the periodic jitter magnitude.

mags = [10.0, 20.0, 30.0, 40.0]

for mag in mags:

pert.set_periodic_jitter_magnitude(ch1, mag)

# Make the measurement.

pert.run(record_results=True)

# Get the number of bits and the number of errors, and print the results.

(bits, errs) = pert.get_channel_stats(ch1)

print "Bits: %12d, Errors: %8d, BER: %.3e" % (bits, errs, float(errs)/bits)

# Disconnect from the DUT and close the PeRT session.

pert.disconnect_dut()

pert.close()

if __name__ == "__main__":

main()

Table 2 Example for using Python ctypes facility

Is there a way to GET() a values that was set?

There is no hardware/firmware support for retrieving most of the PeRT

settings. The driver does not

currently cache the values that are set, but may do so in the future.

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Teledyne-lecroy PeRT3 Software Interface Manuel d'utilisateur Page 11

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