diff --git a/tests/data/ccd/QE.csv b/tests/data/ccd/QE.csv
new file mode 100644
index 0000000..d4f6139
--- /dev/null
+++ b/tests/data/ccd/QE.csv
@@ -0,0 +1,12 @@
+wavelength [nm],QE [electron / photon]
+400,1
+410,1
+420,1
+430,1
+440,1
+450,1
+460,1
+470,1
+480,1
+490,1
+500,1
diff --git a/tests/data/esbo-etc_defaults.xml b/tests/data/esbo-etc_defaults.xml
index 04e6ee1..8d8d6d2 100644
--- a/tests/data/esbo-etc_defaults.xml
+++ b/tests/data/esbo-etc_defaults.xml
@@ -45,7 +45,7 @@
             <pixel_geometry val="1024, 1024" val_unit="pix" comment="Pixel geometry"/>
             <center_offset val="0, 0" val_unit="pix" comment="Shift of the array center"/>
             <pixel>
-                <quantum_efficiency val="data/ccd/PCO-Edge-42-QE.txt" comment="Quantum efficiency of the detector pixel"/>
+                <quantum_efficiency val="tests/data/ccd/QE.csv" comment="Quantum efficiency of the detector pixel"/>
                 <pixel_size val="6.5" val_unit="um"/>
                 <dark_current val="20" val_unit="electron / (pix * s)" comment="Detector dark current"/>
                 <sigma_read_out val="10.0" val_unit="electron(1/2) / pix" comment="Detector readout noise in e-rms"/>
diff --git a/tests/sensor/test_Imager.py b/tests/sensor/test_Imager.py
index 75ad568..65b93a3 100644
--- a/tests/sensor/test_Imager.py
+++ b/tests/sensor/test_Imager.py
@@ -23,7 +23,7 @@ class TestImager(TestCase):
 
     def test_getSNR(self):
         snr = self.imager.getSNR(0.1 * u.s)
-        self.assertAlmostEqual(snr.value, 5.694075373738752)
+        self.assertAlmostEqual(snr.value, 7.112939048582188)
 
     def test_getExpTime(self):
         exp_time = 0.1 * u.s