DS1000Z Rigol Waveform Examples
Scott Prahl
March 2021
The goal of this notebook was to figure out the origins of the raw data to voltage conversion on the Rigol 1000Z oscilloscope .wfm files and also validate the conversion against .csv files. Unfortunately interpretation of files created by this family of scopes is still problematic.
If RigolWFM is not installed, uncomment the following cell (i.e., delete the #) and run (shift-enter)
[1]:
#!pip install --user RigolWFM
[2]:
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
try:
import RigolWFM.wfm as rigol
except ModuleNotFoundError:
print('RigolWFM not installed. To install, uncomment and run the cell above.')
print('Once installation is successful, rerun this cell again.')
repo = "https://github.com/scottprahl/RigolWFM/raw/master/wfm/"
Honestly, the Rigol firmware for these scopes is a disaster
This should be a trival conversion. The scope stores a series of byte values and there is a scale and offset to convert these to volts. Now for every other Rigol oscilloscope the conversion is
volts = (raw-127)*scale - offset
At least two other people [@michal-szkutnik](https://github.com/michal-szkutnik/pyRigolWfm1000Z) and [@crasu](https://github.com/michal-szkutnik/pyRigolWfm1000Z/issues/3#issue-196373027) have tried to sort this out without apparent success.
So what is the story? Rigol has gone through a series of firmware revisions and things are still not right with the lastest version.
The current status is that the voltage scale seems to be pretty close to correct as long as the scale factor is calculated by
scale = volt_per_division/20
The offset seems to be completely arbitrary. Consequently, if you want to use converted .wfm data, validate it against your own measurement first!
The list of Rigol scopes that probably suffer from the same firmware problems are: DS1074Z-S, DS1104Z, DS1104Z-S, DS1054Z, MSO1054Z, DS1074Z, MSO1074Z, MSO1104Z and the DS1202Z.
[3]:
# Just a couple of handy functions to simplify making comparison graphs.
def plot_compare_one(w, csv_times, csv_data, chno):
if chno-1 >= len(w.channels):
return
if chno >= len(csv_data):
return
ch = w.channels[chno-1]
if not ch.enabled:
return
plt.figure(num=None, figsize=(12, 6), dpi=80, facecolor='w', edgecolor='k')
name=w.basename
plt.title("CH%d: %.3fV/div, %.2fVoff (%s %s) "% (chno,ch.volt_per_division,ch.volt_offset,name, w.firmware))
plt.plot(csv_times, csv_data[chno], color='green', label='CSV')
plt.plot(ch.times, ch.volts, color='red', label='WFM')
plt.xlabel("Time (s)")
plt.ylabel("Volts")
plt.grid(True)
plt.legend(loc="upper right")
plt.axhline(0,color='black',linestyle=':')
plt.show()
def plot_compare(w, csv_times, csv_data, toffset=0):
for i in [1,2,3,4]:
plot_compare_one(w, csv_times-toffset, csv_data, i)
def scale_plot(w,csv_times,csv_data,chno,scale,v_offset,csv_h_offset,half_ns):
if chno-1 >= len(w.channels):
return
plt.figure(num=None, figsize=(12, 6), dpi=80, facecolor='w', edgecolor='k')
ch=w.channels[chno-1]
v = ch.volts*scale+v_offset
vmax = max(v)
vmin = min(v)
diff = vmax - vmin
plt.plot(ch.times*1e9,v,label="$\Delta$V=%.2f (WFM)"%(diff))
if chno < len(csv_data):
v=csv_data[chno]
vmax = max(v)
vmin = min(v)
diff = vmax - vmin
plt.plot(csv_times*1e9+csv_h_offset,v,label="$\Delta$V=%.2f (CSV)"%(diff))
name=w.basename
plt.legend(loc="upper right")
plt.title("CH%d, %.2fV/div %.2fVoff (%s %s)" % (chno, ch.volt_per_division, ch.volt_offset, name, w.firmware))
plt.xlim(-half_ns,half_ns)
plt.axhline(0,color='black',linestyle=':')
plt.show()
# print(" volt/division = %.4f" % (ch.volt_per_division))
# print(" (volt/division)/20 = %.4f" % (ch.volt_per_division/20.0))
# print(" y_scale = %.4f" % (ch.y_scale))
# print(" %.3f * y_scale = %.4f (actual value)" % (scale, ch.y_scale*scale))
# print("(volt/division)/21.0 = %.4f" % (-ch.volt_per_division/21))
A list of Rigol scopes in the DS1000Z family is:
[4]:
print(rigol.DS1000Z_scopes)
['Z', '1000Z', 'DS1000Z', 'DS1202Z', 'DS1054Z', 'MSO1054Z', 'DS1074Z', 'MSO1074Z', 'DS1074Z-S', 'DS1104Z', 'MSO1104Z', 'DS1104Z-S']
Background on the voltage and time conversions.
It is bit confusing because the .wfm files and the .csv files can differ. I think that the .wfm files always correspond to the scope’s RAW mode and the .csv files can be limited to just the display or NORMAL mode.
Voltage conversion
From the Rigol Programming Guide
page 2-221:: > volts = (raw_byte - YORigin - YREFerence) * YINCrement
page 2-223, assuming RAW mode:: > YINCrement = VerticalScale/25
YORigin = VerticalOffset/YINCrement
YREFerence is always 127
So this becomes:: > volts = (raw_byte - VerticalOffset/YINCrement - 127) * YINCrement
volts = (raw_byte - 127) * YINCrement - VerticalOffset
volts = (raw_byte - 127) * VerticalScale/25 - VerticalOffset
and this can be interpreted as
volts = (raw_byte - 127.0) * VoltsPerDivision/25.0 - VerticalOffset
Where the decimal points are needed to force python avoid integer math.
Now based on actually comparing DS1054Z .wfm data with .csv data, the above equation fails. This is unfortunate because this is the equation used all other Rigol scopes. Instead the equation is something like
volts = (raw_byte - 127) * (-VerticalScale/20) - VerticalOffset + VerticalScale
Gaak.
Time Conversions
On page 2-222 we find that
XINCrement the time difference between two neighboring points of the specified channel source in the X direction and
XINCrement = 1/SampleRate
on the other hand, when the scope is in NORMAL mode or display mode, then
XINCrement = TimeScale/100
XORigin is the start time of the waveform data of the channel source currently selected in the X direction.
Both should be in seconds.
CSV Files
Display saving
It seems that the time parameters provided in the .csv file (when saving the display points) is set so the center point is at time zero. There are twelve divisions that are saved and each division has 100 points. Therefore the time increment is given by
time_increment = time_per_division/100
and the start time is
-600 * time_increment
(There is probably an time offset also …)
Start with waveform with a single trace
[Contributed by @JBR48](https://github.com/michal-szkutnik/pyRigolWfm1000Z/issues/1#issuecomment-212646090)
First let’s look at the description of the internal file structure. We see that only channel 1 has been enabled. Unfortunately, there is not an accompanying .csv file so we cannot do much more than verify that the file is parsed and displays a plausible 5kHz sine wave.
[5]:
# raw=true is needed because this is a binary file
wfm_url = repo + "MSO1104.wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
description = w.describe()
print(description)
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/MSO1104.wfm?raw=true'
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.03.SP2
Filename = MSO1104.wfm
Channels = [1]
Channel 1:
Coupling = AC
Scale = 5.00 V/div
Offset = 400.00 mV
Probe = 10X
Inverted = False
Time Base = 1.000 ms/div
Offset = -200.000 ps
Delta = 1000.000 ns/point
Points = 1200512
Count = [ 1, 2, 3 ... 1200511, 1200512]
Raw = [ 174, 175, 176 ... 70, 70]
Times = [-600.256 ms,-600.255 ms,-600.254 ms ... 600.255 ms,600.256 ms]
Volts = [ 16.35 V, 16.60 V, 16.85 V ... -9.65 V, -9.65 V]
[6]:
ch = w.channels[0]
plt.plot(ch.times*1e3-0.04, ch.volts)
plt.xlabel("Time (ms)")
plt.ylabel("Volts (V)")
plt.xlim(-1.2,1.2)
plt.title("Center of MSO1104.wfm")
plt.xticks(np.linspace(-1.2,1.2,13))
plt.grid(True)
plt.show()
DS1074Z-A Scope file
[Contributed by @ro-bercik](https://github.com/michal-szkutnik/pyRigolWfm1000Z/issues/4#issue-361649641)
Note that this file uses old 04.04.SP3 firmware and both the offset and scaling is a bit off. Specifically, it looks like the scaling factor (usually, volts_per_division/20) is (usually, volts_per_division/21).
[7]:
name = "DS1074Z-A"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1074Z-A.wfm?raw=true'
[8]:
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 2.000000e-05 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
print(w.describe())
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.04.SP3
Filename = DS1074Z-A.wfm
Channels = [1, 2, 3]
Channel 1:
Coupling = AC
Scale = 50.00 mV/div
Offset = 0.00 V
Probe = 1X
Inverted = False
Time Base = 2.000 ms/div
Offset = 10.000 ms
Delta = 8.000 ns/point
Points = 3000128
Count = [ 1, 2, 3 ... 3000127, 3000128]
Raw = [ 115, 115, 115 ... 140, 140]
Times = [-2.001 ms,-2.001 ms,-2.000 ms ... 22.001 ms,22.001 ms]
Volts = [ 20.00 mV, 20.00 mV, 20.00 mV ... 82.50 mV, 82.50 mV]
Channel 2:
Coupling = AC
Scale = 500.00 mV/div
Offset = 0.00 V
Probe = 1X
Inverted = False
Time Base = 2.000 ms/div
Offset = 10.000 ms
Delta = 8.000 ns/point
Points = 3000128
Count = [ 1, 2, 3 ... 3000127, 3000128]
Raw = [ 54, 53, 54 ... 88, 88]
Times = [-2.001 ms,-2.001 ms,-2.000 ms ... 22.001 ms,22.001 ms]
Volts = [ -1.33 V, -1.35 V, -1.33 V ... -475.00 mV,-475.00 mV]
Channel 3:
Coupling = AC
Scale = 200.00 mV/div
Offset = 0.00 V
Probe = 1X
Inverted = False
Time Base = 2.000 ms/div
Offset = 10.000 ms
Delta = 8.000 ns/point
Points = 3000128
Count = [ 1, 2, 3 ... 3000127, 3000128]
Raw = [ 112, 112, 112 ... 106, 106]
Times = [-2.001 ms,-2.001 ms,-2.000 ms ... 22.001 ms,22.001 ms]
Volts = [ 50.00 mV, 50.00 mV, 50.00 mV ... -10.00 mV,-10.00 mV]
[9]:
plot_compare(w, csv_times, csv_data, -0.01)
[10]:
scale=0.952
end_ns=20000000
scale_plot(w,csv_times,csv_data,1,scale,0.0,end_ns/2,end_ns)
scale_plot(w,csv_times,csv_data,2,scale,0.4,end_ns/2,end_ns)
scale_plot(w,csv_times,csv_data,3,scale,-0.05,end_ns/2,end_ns)
DS1054Z-A Scope file
[Contributed by @JensRestemeier](https://github.com/scottprahl/RigolWFM/issues/5#issuecomment-599158528)
[11]:
name = "DS1054Z-A"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 5.000000e-10 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
print(w.describe())
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-A.wfm?raw=true'
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.04.SP4
Filename = DS1054Z-A.wfm
Channels = [1, 2, 3, 4]
Channel 1:
Coupling = DC
Scale = 2.00 V/div
Offset = 3.00 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 158, 157, 159 ... 176, 176]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [ 2.10 V, 2.00 V, 2.20 V ... 3.90 V, 3.90 V]
Channel 2:
Coupling = DC
Scale = 2.00 V/div
Offset = 820.00 mV
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 124, 123, 124 ... 128, 129]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [880.00 mV,780.00 mV,880.00 mV ... 1.28 V, 1.38 V]
Channel 3:
Coupling = DC
Scale = 2.00 V/div
Offset = -3.60 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 103, 103, 102 ... 102, 104]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [ 3.20 V, 3.20 V, 3.10 V ... 3.10 V, 3.30 V]
Channel 4:
Coupling = DC
Scale = 5.00 V/div
Offset = -16.36 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 41, 40, 40 ... 28, 28]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [-140.00 mV,-390.00 mV,-390.00 mV ... -3.39 V, -3.39 V]
[12]:
scale=1
end_ns=200
offset_ns=-62
scale_plot(w,csv_times,csv_data,1,scale,0.0,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,2,scale,0.2,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,3,scale,0.33,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,4,scale,3,offset_ns,end_ns)
DS1054Z-B Scope file
[Contributed by @JensRestemeier](https://github.com/scottprahl/RigolWFM/issues/5#issuecomment-599210113)
[13]:
name = "DS1054Z-B"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 4.000000e-9 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-B.wfm?raw=true'
[14]:
scale=0.952
end_ns=600
offset_ns=918
scale_plot(w,csv_times,csv_data,1,scale,0.0,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,2,scale,0.2,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,3,scale,0.33,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,4,scale,0.38,offset_ns,end_ns)
[15]:
plot_compare(w, csv_times, csv_data, 0)
DS1054Z-C Scope file
[Contributed by @electronoob.](https://github.com/scottprahl/RigolWFM/issues/5#issuecomment-600314960)
[16]:
name = "DS1054Z-C"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
# this .csv file has the last 250000 points removed
t_incr = 4.000000e-9 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-C.wfm?raw=true'
[17]:
scale=1
end_ns=6000000
offset_ns=-77-5000000
scale_plot(w,csv_times,csv_data,1,scale,0.1,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,2,scale*1.2,7.2,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,3,scale,0.38,offset_ns,end_ns)
scale_plot(w,csv_times,csv_data,4,scale,1.1,offset_ns,end_ns)
[18]:
plot_compare(w, csv_times, csv_data, 0.005)
DS1054Z-D Scope file
[Contributed by @JensRestemeier](https://github.com/scottprahl/RigolWFM/issues/5#issuecomment-602181223)
[19]:
name = "DS1054Z-D"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 4.000000e-9 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-D.wfm?raw=true'
[20]:
print(w.describe())
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.04.SP4
Filename = DS1054Z-D.wfm
Channels = [1, 2, 3, 4]
Channel 1:
Coupling = DC
Scale = 5.00 V/div
Offset = 11.25 V
Probe = 10X
Inverted = False
Time Base = 500.000 µs/div
Offset = -220.000 µs
Delta = 4.000 ns/point
Points = 1500128
Count = [ 1, 2, 3 ... 1500127, 1500128]
Raw = [ 121, 120, 121 ... 121, 121]
Times = [-3.220 ms,-3.220 ms,-3.220 ms ... 2.780 ms, 2.780 ms]
Volts = [ -7.75 V, -8.00 V, -7.75 V ... -7.75 V, -7.75 V]
Channel 2:
Coupling = DC
Scale = 1.00 V/div
Offset = 940.00 mV
Probe = 10X
Inverted = False
Time Base = 500.000 µs/div
Offset = -220.000 µs
Delta = 4.000 ns/point
Points = 1500128
Count = [ 1, 2, 3 ... 1500127, 1500128]
Raw = [ 123, 124, 124 ... 124, 124]
Times = [-3.220 ms,-3.220 ms,-3.220 ms ... 2.780 ms, 2.780 ms]
Volts = [-140.00 mV,-90.00 mV,-90.00 mV ... -90.00 mV,-90.00 mV]
Channel 3:
Coupling = DC
Scale = 10.00 V/div
Offset = -8.50 V
Probe = 10X
Inverted = False
Time Base = 500.000 µs/div
Offset = -220.000 µs
Delta = 4.000 ns/point
Points = 1500128
Count = [ 1, 2, 3 ... 1500127, 1500128]
Raw = [ 70, 70, 70 ... 70, 70]
Times = [-3.220 ms,-3.220 ms,-3.220 ms ... 2.780 ms, 2.780 ms]
Volts = [-10.00 V,-10.00 V,-10.00 V ... -10.00 V,-10.00 V]
Channel 4:
Coupling = DC
Scale = 2.00 V/div
Offset = -6.94 V
Probe = 10X
Inverted = False
Time Base = 500.000 µs/div
Offset = -220.000 µs
Delta = 4.000 ns/point
Points = 1500128
Count = [ 1, 2, 3 ... 1500127, 1500128]
Raw = [ 33, 33, 33 ... 33, 33]
Times = [-3.220 ms,-3.220 ms,-3.220 ms ... 2.780 ms, 2.780 ms]
Volts = [-460.00 mV,-460.00 mV,-460.00 mV ... -460.00 mV,-460.00 mV]
[21]:
plot_compare(w, csv_times, csv_data, toffset=0)
[22]:
scale=1.0
end_ns=3000000
offset_ns=-220100
scale_plot(w,csv_times,csv_data,1,scale,7.9,offset_ns,end_ns)
Summarizing all the results
It is not pretty. If there was anything consistent, then it is not apparent to me!
[23]:
vd = np.array([2,2,2,5,2,2,2,2,1,5,2,5,5,1,10,2])
voff = np.array([3,0.82,-3.6,-16.36,4.8,0.52,-5.02,-7.54,0.81,-0.5,-3.92,-14.1,11.25,0.94,-8.5,-6.94])
yoff = voff-vd
vcorrect = np.array([0,0.2,0.33,3,0,0.2,0.33,0.38,0.1,7.2,0.38,1.1,7.9,0.1,9.8,0.45])
plt.plot(vd,vcorrect-vd,'ob')
plt.xlabel('Volts/Division')
plt.ylabel('Needed correction (V)')
plt.show()
plt.plot(voff,vcorrect,'ob')
plt.xlabel('Volt Offset')
plt.ylabel('Needed correction (V)')
plt.show()
Testing channel selection
[24]:
name = "DS1054Z-A"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z', selected='24')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 5.000000e-10 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
print(w.describe())
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-A.wfm?raw=true'
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.04.SP4
Filename = DS1054Z-A.wfm
Channels = [1, 2, 3, 4]
Channel 1:
Coupling = DC
Scale = 2.00 V/div
Offset = 3.00 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Channel 2:
Coupling = DC
Scale = 2.00 V/div
Offset = 820.00 mV
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 124, 123, 124 ... 128, 129]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [880.00 mV,780.00 mV,880.00 mV ... 1.28 V, 1.38 V]
Channel 3:
Coupling = DC
Scale = 2.00 V/div
Offset = -3.60 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Channel 4:
Coupling = DC
Scale = 5.00 V/div
Offset = -16.36 V
Probe = 10X
Inverted = False
Time Base = 50.000 ns/div
Offset = 0.000 s
Delta = 4.000 ns/point
Points = 278
Count = [ 1, 2, 3 ... 277, 278]
Raw = [ 41, 40, 40 ... 28, 28]
Times = [-556.000 ns,-551.986 ns,-547.971 ns ... 551.986 ns,556.000 ns]
Volts = [-140.00 mV,-390.00 mV,-390.00 mV ... -3.39 V, -3.39 V]
[ ]:
DS1054Z-D Scope file
[Contributed by @wvdv2002](https://github.com/scottprahl/RigolWFM/pull/17)
[25]:
name = "DS1054Z-ch1SquareCH4Uart"
wfm_url = repo + name + ".wfm" + "?raw=true"
w = rigol.Wfm.from_url(wfm_url, '1000Z')
csv_filename = repo + name + ".csv"
csv_data = np.genfromtxt(csv_filename, delimiter=',', skip_header=2)
csv_data = csv_data[:,:-1].T
t_incr = 4.000000e-08 # seconds/point
t_start = -len(csv_data[0])/2.0 * t_incr # seconds so that t=0 is in the center
csv_times = csv_data[0] * t_incr + t_start # seconds
plot_compare(w, csv_times, csv_data, toffset=0)
downloading 'https://github.com/scottprahl/RigolWFM/raw/master/wfm/DS1054Z-ch1SquareCH4Uart.wfm?raw=true'
[26]:
print(w.describe())
General:
File Model = wfm1000z
User Model = 1000Z
Parser Model = wfm1000z
Firmware = 00.04.04.SP3
Filename = DS1054Z-ch1SquareCH4Uart.wfm
Channels = [1, 4]
Channel 1:
Coupling = DC
Scale = 1.00 V/div
Offset = -500.00 mV
Probe = 10X
Inverted = False
Time Base = 200.000 µs/div
Offset = 0.000 s
Delta = 40.000 ns/point
Points = 60256
Count = [ 1, 2, 3 ... 60255, 60256]
Raw = [ 170, 170, 170 ... 170, 170]
Times = [-1.205 ms,-1.205 ms,-1.205 ms ... 1.205 ms, 1.205 ms]
Volts = [ 3.65 V, 3.65 V, 3.65 V ... 3.65 V, 3.65 V]
Channel 4:
Coupling = DC
Scale = 1.00 V/div
Offset = 0.00 V
Probe = 10X
Inverted = False
Time Base = 200.000 µs/div
Offset = 0.000 s
Delta = 40.000 ns/point
Points = 60256
Count = [ 1, 2, 3 ... 60255, 60256]
Raw = [ 188, 188, 188 ... 187, 188]
Times = [-1.205 ms,-1.205 ms,-1.205 ms ... 1.205 ms, 1.205 ms]
Volts = [ 4.05 V, 4.05 V, 4.05 V ... 4.00 V, 4.05 V]
[ ]: