diff --git a/pycwr/io/PAFile.py b/pycwr/io/PAFile.py
index 8cdb7b8..b6923cf 100644
--- a/pycwr/io/PAFile.py
+++ b/pycwr/io/PAFile.py
@@ -30,6 +30,7 @@ def __init__(self, filename, station_lon=None, station_lat=None, station_alt=Non
         self.header = self._parse_BaseDataHeader()
         self.radial = self._parse_radial()
         self.nrays = len(self.radial)
+        print(self.nrays)
         self.nsweeps = self.header['TaskConfig']['CutNumber']
         self.sweep_start_ray_index = np.arange(0, self.nrays, self.nrays // self.nsweeps)
         self.sweep_end_ray_index = self.sweep_start_ray_index + self.nrays // self.nsweeps - 1
@@ -74,7 +75,8 @@ def _parse_radial(self):
             self.MomentNum = RadialDict['MomentNumber']
             self.LengthOfData = RadialDict['LengthOfData']
             RadialDict['fields'] = self._parse_radial_single()
-            radial.append(RadialDict)
+            if RadialDict["fields"]:
+                radial.append(RadialDict)
             buf = self.fid.read(dtype_PA.RadialHeaderBlockSize)
         return radial
 
diff --git a/test/plot_test.py b/test/plot_test.py
index 2e9910e..e31d642 100644
--- a/test/plot_test.py
+++ b/test/plot_test.py
@@ -1,9 +1,10 @@
-from pycwr.io import read_PA, read_auto
+from pycwr.io import read_PA, read_auto, PAFile
 from pycwr.draw.SingleRadarPlotMap import RadarGraphMap
 import matplotlib.pyplot as plt
 
-file = "/Users/zhengyu/Downloads/Z_RADR_I_ZGZ01_20200820220246_O_DOR_DXK_CAR.bin.bz2"
-x = read_auto(file)
+file = "/Users/zhengyu/Downloads/Z_RADR_I_Z0001_20200521191950_O_DOR_DXK_CAR.bin"
+x = read_PA(file)
+y = PAFile.PABaseData(file)
 
 # PRD = read_auto(filename)
 # graph = RadarGraphMap(PRD)