2 files changed, 19 insertions, 3 deletions
diff --git a/qolab/hardware/scope/_basic.py b/qolab/hardware/scope/_basic.py
index 1ceecbc..c0a6f13 100644
--- a/qolab/hardware/scope/_basic.py
+++ b/qolab/hardware/scope/_basic.py
@@ -9,6 +9,22 @@ from qolab.hardware.basic import BasicInstrument
 from qolab.data.trace import TraceSetSameX
 
 
+def calcSparsingAndNumPoints(self, availableNpnts=None, maxRequiredPoints=None):
+    if availableNpnts is None:
+        # using channel 1 to get availableNpnts
+        availableNpnts = self.getAvailableNumberOfPoints(1)
+    if maxRequiredPoints is None:
+        maxRequiredPoints = self.maxRequiredPoints
+
+    if availableNpnts <= maxRequiredPoints * 2:
+        Npnts = availableNpnts
+        sparsing = 1
+    else:
+        sparsing = int(np.floor(availableNpnts / maxRequiredPoints))
+        Npnts = int(np.floor(availableNpnts / sparsing))
+    return (sparsing, Npnts, availableNpnts, maxRequiredPoints)
+
+
 class Scope(BasicInstrument):
     """Minimal class to implement a scope.
 
diff --git a/qolab/hardware/scope/sds1104x.py b/qolab/hardware/scope/sds1104x.py
index 12763ce..4ef4988 100644
--- a/qolab/hardware/scope/sds1104x.py
+++ b/qolab/hardware/scope/sds1104x.py
@@ -3,7 +3,7 @@ Created by Eugeniy E. Mikhailov 2021/11/29
 """
 
 from qolab.hardware.basic import BasicInstrument
-from ._basic import ScopeSCPI
+from ._basic import ScopeSCPI, calcSparsingAndNumPoints
 from qolab.hardware.scpi import response2numStr
 from qolab.data.trace import Trace, TraceXY
 import numpy as np
@@ -112,7 +112,7 @@ class SDS1104X(ScopeSCPI):
             Npnts,
             availableNpnts,
             maxRequiredPoints,
-        ) = self.calcSparsingAndNumPoints(availableNpnts, maxRequiredPoints)
+        ) = calcSparsingAndNumPoints(availableNpnts, maxRequiredPoints)
         if decimate:
             Npnts = availableNpnts  # get all of them and decimate later
         if (sparsing == 1 and Npnts == availableNpnts) or decimate:
@@ -296,7 +296,7 @@ class SDS1104X(ScopeSCPI):
             Npnts,
             availableNpnts,
             maxRequiredPoints,
-        ) = self.calcSparsingAndNumPoints(availableNpnts, maxRequiredPoints)
+        ) = calcSparsingAndNumPoints(availableNpnts, maxRequiredPoints)
         sampleRate = self.getSampleRate()
         timePerDiv = self.getTimePerDiv()
         trigDelay = self.getTrigDelay()