EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: JohnPi on September 01, 2018, 05:09:50 pm
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I am trying to read binary waveforms from my 1045Z using pyvisa over USB. Using sockets over LAN (no pyvisa) works. I have a problem when reading certain specific lengths of data from the instrument -- specifically lengths of 8244 and increments of 64 beyond; using MDEPTH of 30000. I don't know if the issue is in the instrument or pyvisa. I have filed a ticket at https://github.com/pyvisa/pyvisa/issues/354 also. I have tried pyvisa 1.9.1, 1.9.0 & 1.8. My 1054Z is unlocked to 1104Z. This is the *IDN? RIGOL TECHNOLOGIES,DS1104Z,DS1ZA20100****,00.04.04.SP3
If anyone has the same setup, perhaps with different software/firmware versions, I would appreciate if you could run this example and report:
import visa
import numpy as np
import sys
print(sys.version)
print("visa", visa.__version__)
#visa.log_to_screen()
GPIB = visa.ResourceManager()
for resource in GPIB.list_resources(): print(resource) # list instruments -- use the 1054Z in the next line
DS1054Z = GPIB.open_resource('USB0::0x1AB1::0x04CE::DS1ZA20100xxxx::INSTR', chunk_size=40000) # You'll have to change this line
print("DS1054Z:", DS1054Z.query("*IDN?"))
DS1054Z.write(":WAV:FORMAT BYTE;:WAV:MODE RAW;:SYSTEM:BEEPER OFF")
DS1054Z.write(":ACQUIRE:MDEPTH 30000")
DS1054Z.write(":STOP")
err=0
#for NPOINTS in range(20010,30100):
for NPOINTS in range(8200,30100):# fails at 8244 and increments of 64 beyond
print(NPOINTS, end='')
err+=1
DS1054Z.write(":WAV:START 1;:WAV:STOP %i;:WAV:DATA?" % NPOINTS)
print(">",DS1054Z.read_bytes(11),"<", end='') # Contains '#90000ddddd'
try:
CURVE1 = np.frombuffer(DS1054Z.read_bytes(NPOINTS), dtype='b')
except:
print("\nError at", NPOINTS, " after ", err)
err=0
print(len(CURVE1), "chars")
DS1054Z.read_bytes(1) # trailing '\n'
This tests reading lengths from 8200 on in increments of 1. I see fails like this:
8241> b'#9000008241' <8241 chars
8242> b'#9000008242' <8242 chars
8243> b'#9000008243' <8243 chars
8244> b'#9000008244' <
Error at 8244 after 8243
8243 chars
8245> b'#9000008245' <8245 chars
8246> b'#9000008246' <8246 chars
8247> b'#9000008247' <8247 chars
and filtered, the patterns looks like:
Error at 8244 after 8243
Error at 8308 after 64
Error at 8372 after 64
Error at 8436 after 64
Error at 8500 after 64
Error at 8564 after 64
Error at 8628 after 64
Error at 8756 after 128
Error at 8820 after 64
Error at 8884 after 64
Error at 8948 after 64
Error at 9012 after 64
Error at 9076 after 64
Error at 9140 after 64
Error at 9268 after 128
Error at 9332 after 64
Error at 9396 after 64
Has anyone seen anything similar to this ?