add siglent capture script

siglent.py

@@ -0,0 +1,36 @@
+# nix-shell -p python3Packages.pyvisa python3Packages.pyvisa-py python3Packages.numpy
+
+import pyvisa as visa
+import time
+import numpy as np
+
+resources = visa.ResourceManager('@py')
+device = resources.open_resource("TCPIP::192.168.1.145::INSTR", write_termination='\n', query_delay=0.25)
+print(device.query("*IDN?"))
+
+device.write("*RST")
+time.sleep(5)
+
+device.write("MSIZ 20M")
+device.write("TIME_DIV 200MS")
+device.write("C1:VDIV 2V")
+device.write("C2:TRA ON")
+device.write("C2:VDIV 2V")
+
+time.sleep(5)
+
+device.write("STOP")
+
+
+for channel in range(1, 3):
+    sample_num = int(float(device.query("SANU? C{}".format(channel))))
+    print("C{}:{}".format(channel, sample_num))
+
+    device.write("C{}:WF? DAT2".format(channel))
+    response = device.read_raw()[18:]
+    assert len(response) == sample_num
+
+    array = np.frombuffer(response, dtype="u8")
+    np.save("siglent_ch{}.npy".format(channel), array)
+
+    time.sleep(1)