diff --git a/ps6000aExamples/ps6000aBlockExampleExtClk.py b/ps6000aExamples/ps6000aBlockExampleExtClk.py
index e4d429f..4d209a9 100644
--- a/ps6000aExamples/ps6000aBlockExampleExtClk.py
+++ b/ps6000aExamples/ps6000aBlockExampleExtClk.py
@@ -10,7 +10,7 @@
 from picosdk.ps6000a import ps6000a as ps
 from picosdk.PicoDeviceEnums import picoEnum as enums
 import matplotlib.pyplot as plt
-from picosdk.functions import adc2mV, assert_pico_ok
+from picosdk.functions import adc2mV, mV2adc, assert_pico_ok
 from picosdk.constants import PICO_STATUS
 import time
 
@@ -80,7 +80,7 @@ def ExternalReferenceInteractions_callback(handle, statusCallback, reference):
 direction = enums.PICO_THRESHOLD_DIRECTION["PICO_RISING"]
 # delay = 0 s
 # autoTriggerMicroSeconds = 1000000 us
-status["setSimpleTrigger"] = ps.ps6000aSetSimpleTrigger(chandle, 1, source, (mV2adc(100,channelRange,maxADC), direction, 0, 1000000)
+status["setSimpleTrigger"] = ps.ps6000aSetSimpleTrigger(chandle, 1, source, (mV2adc(100,channelRange,maxADC)), direction, 0, 1000000)
 assert_pico_ok(status["setSimpleTrigger"])
 
 # Get fastest available timebase