Index: firmware/App/Controllers/SyringePump.c
===================================================================
diff -u -r40959111de79e7cc3b1dfed5d244d5038e3c375c -r754427f339e660b7fa688e5e3becc587b30518a8
--- firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision 40959111de79e7cc3b1dfed5d244d5038e3c375c)
+++ firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision 754427f339e660b7fa688e5e3becc587b30518a8)
@@ -1743,7 +1743,7 @@
 /*********************************************************************//**
  * @brief
  * The calcMeasRate function calculates the measured rate from a given delta
- * position in last 1 sedond.
+ * position in last 1 second.
  * @details Inputs: syringePumpLastPositions[], syringePumpSpeedCalcTimerCounter
  * @details Outputs: syringePumpMeasRate, syringePumpSpeedCalcTimerCounter
  * @return none
@@ -1754,15 +1754,15 @@
     {
         S32 pos = getSyringePumpPosition();
         U32 nextIdx = INC_WRAP( syringePumpMotorSpeedCalcIdx, 0, SYRINGE_PUMP_SPEED_CALC_BUFFER_LEN - 1 );
-        S32 countsPerSec = pos - syringePumpLastPositions[ nextIdx ];     // Calc delta between pos 1 second ago and pos now
+        S32 countsPerSec = pos - syringePumpLastPositions[ syringePumpMotorSpeedCalcIdx ];     // Calc delta between pos 1 second ago and pos now
         S32 countsPerHr = countsPerSec * ( MIN_PER_HOUR * SEC_PER_MIN);
         F32 mLPerHr = (F32)((double)countsPerHr / (double)SYRINGE_ENCODER_COUNTS_PER_ML);
 
         // Set latest measured rate
         syringePumpMeasRate.data = mLPerHr;
 
         // Update last position for next time
-        syringePumpLastPositions[ nextIdx ] = pos;
+        syringePumpLastPositions[ syringePumpMotorSpeedCalcIdx ] = pos;
         syringePumpMotorSpeedCalcIdx = nextIdx;
         syringePumpSpeedCalcTimerCounter = 0;
     }