I am writing a python script that interacts with a DPO4104 Oscilliscope using SCPI over eternet via pivisa. I have gotten many features to work following the commands in the DPO4000 Series programmer manual. I am stuck trying to set the sample frequency.
I am able to read the frequency with the command:
horizontal:samplerate?
but I am unable to change the command with:
horizontal:samplerate 100000
I have tried the abbreviated form of the command, and tried decimal and scientific notation for the value. Any attempt does not seem to have any effect on the oscilloscope, and I am not getting any errors in python. Below is minimal code to reproduce (hopefully) the problem I am having.
import pyvisa
rm = pyvisa.ResourceManager()
scope = rm.open_resource("TCPIP::192.168.20.82::INSTR")
print(scope.query("*idn?"))
print(scope.query("horizontal:samplerate?"))
scope.write("horizontal:samplerate 500.0000E+3")
print(scope.query("horizontal:samplerate?"))
Output:
TEKTRONIX,DPO4104,B010495,CF:91.1CT FV:v2.48
1.0000E+6
1.0000E+6
