diff --git a/test_ohmpi_card_3_15.py b/test_ohmpi_card_3_15.py
index 5df2caf436d8b09d3cf55de08ffe0362820abd4b..f6893864b449a4bb4772872cc5d7e4a9d4873846 100644
--- a/test_ohmpi_card_3_15.py
+++ b/test_ohmpi_card_3_15.py
@@ -34,5 +34,5 @@ from utils import change_config
 
 change_config('config_ohmpi_card_3_15.py', verbose=False)
 k = OhmPiHardware()
-k._vab_pulse(vab=12, length=2., sampling_rate=20., polarity=1)
+k._vab_pulse(vab=12, length=1., sampling_rate=100., polarity=1)
 change_config('config_default.py', verbose=False)
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