diff --git a/src/KeithleyDDCProtocol.cpp b/src/KeithleyDDCProtocol.cpp
index dec49ae6cac2fe316e4e144d2857b3b160034871..d379bb8967995181e6e1a66656455061ede8f7d3 100644
--- a/src/KeithleyDDCProtocol.cpp
+++ b/src/KeithleyDDCProtocol.cpp
@@ -406,7 +406,7 @@ std::string argout("no data");
 	cmd_to_send << "U0X" << std::endl;
 	argout = _communication_link->write_read(cmd_to_send.str());
 
-	std::cout << "\n\nKeithleyDDCProtocol::get_raw_status returns *" << argout << "*" << std::ends;
+//	std::cout << "\n\nKeithleyDDCProtocol::get_raw_status returns *" << argout << "*" << std::ends;
 
 	return argout;
 }
diff --git a/src/Keithley_486.cpp b/src/Keithley_486.cpp
index 979a572f5f26c374c163de0aa2691b263f0c0ef6..8951221b36c9cdebb0b64e043c6b4ff4080690f5 100644
--- a/src/Keithley_486.cpp
+++ b/src/Keithley_486.cpp
@@ -242,7 +242,7 @@ std::string Keithley_486::electrometer_status (void)
 		argout = "Keithley Type : " + modelNum + "\n";
 		//- Display Intensity ('A')
 		tmp = _kstatus.substr(_kstatus.find('A')+1,1);
-	std::cout << "\nDisplay Intensity = *" << tmp <<"*" << std::endl;
+//	std::cout << "\nDisplay Intensity = *" << tmp <<"*" << std::endl;
 		if(!XString<short>::convertFromString(tmp))
 			argout += "Display Intensity : NORMAL\n";
 		else
@@ -253,7 +253,7 @@ std::string Keithley_486::electrometer_status (void)
 			argout += "Display Intensity : OFF\n";
 		//- Reading Source ('B')
 		tmp = _kstatus.substr(_kstatus.find('B')+1,1);
-	std::cout << "\nReading Source = *" << tmp <<"*" << std::endl;
+//	std::cout << "\nReading Source = *" << tmp <<"*" << std::endl;
 		if(!XString<short>::convertFromString(tmp))
 			argout += "Reading Source : A/D Reading\n";
 		else
@@ -270,7 +270,7 @@ std::string Keithley_486::electrometer_status (void)
 			argout += "Reading Source : Min Data Store Reading\n";
 		//- Zero check state ('C')
 		tmp = _kstatus.substr(_kstatus.find('C')+1,1);
-	std::cout << "\nZero check state = *" << tmp <<"*" << std::endl;
+//	std::cout << "\nZero check state = *" << tmp <<"*" << std::endl;
 		if(XString<short>::convertFromString(tmp))
 			argout += "Zero Check : Enabled\n";
 		else
@@ -373,7 +373,7 @@ std::string Keithley_486::electrometer_status (void)
 		//- Range ('Rmn')
 		//- check AutoRange
 		tmp = _kstatus.substr(_kstatus.find('R')+1,2);
-		std::cout << "\ncheck AutoRange = *" << tmp[0] << "*" << std::endl;
+//		std::cout << "\ncheck AutoRange = *" << tmp[0] << "*" << std::endl;
 //		if(atoi(&tmp[0]) == 0)
 		if(tmp[0] == '0')
 			argout += "Range : AutoRange Disabled\n";
@@ -383,7 +383,7 @@ std::string Keithley_486::electrometer_status (void)
 //		tmp = _kstatus.substr(_kstatus.find('R')+2,1);
 		_range = atoi(&tmp[1]);
 		_rangeStr = K486_rangeValue[_range];
-	std::cout << "\nRange = *" << _range <<"*" << ", RangeStr=" << _rangeStr << std::endl;
+//	std::cout << "\nRange = *" << _range <<"*" << ", RangeStr=" << _rangeStr << std::endl;
 		argout   += _rangeStr + "\n";
 		//- Integration Period ('S')
 		tmp = _kstatus.substr(_kstatus.find('S')+1,1);
diff --git a/src/Keithley_617.cpp b/src/Keithley_617.cpp
index 2050d0145e57b0598245919a9ddfa37cfa2c1b4c..ff984fc842ca3eba1f7c4e61f13c66cf5f9cee47 100644
--- a/src/Keithley_617.cpp
+++ b/src/Keithley_617.cpp
@@ -249,7 +249,7 @@ std::string Keithley_617::electrometer_status (void)
 	{
 		//- model number :
 		std::string modelNum = _kstatus.substr(0,3);
-    std::cout<< "\n617 status = " << modelNum << std::endl;
+//    std::cout<< "\n617 status = " << modelNum << std::endl;
     //- if not expected data (here model number)
 		if(modelNum.find("617") == std::string::npos)
 		{
diff --git a/src/Keithley_6485.cpp b/src/Keithley_6485.cpp
index 48bfdd423e647c22f633584394275d677b615a04..a8ced38a5d8c0156866f9e2e2598a11a02721bad 100644
--- a/src/Keithley_6485.cpp
+++ b/src/Keithley_6485.cpp
@@ -192,7 +192,7 @@ std::stringstream cmd_to_send;
 
   if(numPLC <= 0 || numPLC > 5.0)
 	{
-    std::cout << "Keithley_6485::set_knplc -> " << numPLC << std::endl;
+//    std::cout << "Keithley_6485::set_knplc -> " << numPLC << std::endl;
 		throw electrometer::ElectrometerException("OUT_OF_RANGE", 
 												"Invalid number of PLC.\n Please enter a value in the range 0.01 to 5.0.",
 												"Keithley_6485::set_knplc( ).");