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Digital Oscilloscope Series
250
Common Command Examples
This section lists the programming instances of common commands.
Environment: Windows 7 32-bit, Python v3.4.3, pyvisa-1.7, Matplotlib-1.5.1
Read Waveform Data (WF) Example
import visa
import pylab as pl
def main():
_rm = visa.ResourceManager()
sds = _rm.open_resource("USB0::0xF4EC::0xEE38::0123456789::INSTR")
sds.write("chdr off")
vdiv = sds.query("c1:vdiv?")
ofst = sds.query("c1:ofst?")
tdiv = sds.query("tdiv?")
sara = sds.query("sara?")
sara_unit = {'G':1E9,'M':1E6,'k':1E3}
for unit in sara_unit.keys():
if sara.find(unit)!=-1:
sara = sara.split(unit)
sara = float(sara[0])*sara_unit[unit]
break
sara = float(sara)
sds.timeout = 30000 #default value is 2000(2s)
sds.chunk_size = 20*1024*1024 #default value is 20*1024(20k bytes)
sds.write("c1:wf? dat2")
recv = list(sds.read_raw())[15:]
recv.pop()
recv.pop()
volt_value = []
for data in recv:
if data > 127:
data = data - 255
else:
pass
volt_value.append(data)
time_value = []
for idx in range(0,len(volt_value)):
volt_value[idx] = volt_value[idx]/25*float(vdiv)-float(ofst)
time_data = -(float(tdiv)*14/2)+idx*(1/sara)
time_value.append(time_data)
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