Add DAQ6510 Thermistor Example

Added example for scanning thermistors on DAQ and readme, updated DAQ6510 folder readme.

Instrument_Examples/DAQ6510/README.md

@@ -36,7 +36,10 @@ TSP and Python with Visual Basic examples to scan temperature with thermocouples
 TSP and Python examples demonstrating the use of NPLC and Autozero functions to accurately measure low voltage. See README in directory for more. 
 
 * **[Scanning Resistors with 4W Measurement](./Scanning_Resistors_Using_4W_Measurement/)**  
-Python examples to scan ressitance measurements with a preference for 4-wire/Kelvin connections. See README in directory for more. 
+Python examples to scan resistance measurements with a preference for 4-wire/Kelvin connections. See README in directory for more. 
+
+* **[Scanning User Defined Thermistors](./Scanning_User_Defined_Thermistors/)**  
+TSP Example to create a scan measuring thermistors outside of the default options or user defined thermistors. See README in directory for more. 
 
 * **[Speed Scanning for Increased Throughput](./Speed_Scanning_for_Increased_Test_Throughput/)**  
 TSP and Python examples demonstrating differences in scan speed between the 7700, 7703, and 7710 multiplexer modules. See README in directory for more. 

Instrument_Examples/DAQ6510/Scanning_User_Defined_Thermistors/README.md

@@ -0,0 +1,29 @@
+
+# Scanning User Defined Thermistors
+
+This example application demonstrates how to create a scan to measure user defined thermistors. 
+
+A thermistor is a resistor whose value varies with temperature. The relationship is non-linear but well defined. These two-terminal devices are one of the most common and readily available temperature measurement devices. The semiconductor metal oxide makes them sensitive to small temperature changes. Thermistors work best in various temperatures and applications because they are durable and reliable. There are two types of thermistors:
+
+Negative Temperature Coefficient (NTC) Thermistors
+* Negative resistance to temperature relationship
+* Resistance decreases as temperature increases
+
+Positive Temperature Coefficient (PTC) Thermistors
+* Positive resistance to temperature relationship
+* Resistance increases as temperature increases
+* Useful for applications such as fuses
+
+This script is built for doing thermistors measurements based to the Steinhart-Hart equation.The Steinhart-Hart equation is a model relating the varying electrical resistance of a semiconductor to its varying temperatures. The equation is :
+    1/T = A + B*ln(R)+ C(ln(R))^3
+where
+    T is the temperature (in kelvins),
+	R is the resistance at T (in ohms)
+	A, B and C are the Steinhart-Hart coefficients, which are characteristics specific to the bulk semiconductor material over a given temperature range of interest.
+
+        
+To set up for the Steinhart-Hart model, we must find three reference temperatures. First, find the temperature range of the desired thermistor and take note of it. Our first reference temperature will be the lowest temperature in the range. The second reference temperature is somewhere close to the middle of the range and is usually the standard temperature 25C. The third reference temperature is the highest temperature in the thermistor's range. After noting these temperatures, we find their corresponding resistance values. These are either listed in the thermistor's datasheet, or we source a temperature and measure the thermistor's resistance at each of these points. 
+
+With this script you are limited to one model of thermistor (TDK B57164K, R25 = 2.2K) but you can start from this script and define as much variables as you want to define dedicated thermistor's curve. 
+
+This script measure two thermistors 2.2K TDK B57164K on channels 111 and 116 from a DAQ6510's 7700 card. One Type K thermocouple is used on channel 112 to check the good results from channels 111 and 116.

Instrument_Examples/DAQ6510/Scanning_User_Defined_Thermistors/Scanning_User_Defined_Thermistors.tsp

@@ -0,0 +1,150 @@
+---@diagnostic disable: undefined-global, lowercase-global
+--[[
+    
+    Description:
+    
+    A thermistor is a resistor whose value varies with temperature. The relationship is non-linear but well defined. 
+	These two-terminal devices are one of the most common and readily available temperature measurement devices. 
+	The semiconductor metal oxide makes them sensitive to small temperature changes. Thermistors work best in various 
+	temperatures and applications because they are durable and reliable. There are two types of thermistors, negative temperature 
+	coefficient (NTC) and positive temperature coefficient(PTC) thermistors. NTCs display a negative resistance to 
+	temperature relationship. This means that the resistance of an NTC thermistor will decrease as temperature increases. 
+	Conversely, PTC thermistors have a positive resistance to temperature relationship, where resistance increases 
+	as temperature increases. This makes them useful for applications such as fuses.
+	
+	This script is built for doing thermistors measurements based to the Steinhart-Hart equation.
+    The Steinhart�Hart equation is a model relating the varying electrical resistance of a semiconductor to its varying temperatures. The equation is :
+
+	1/T = A + B*ln(R)+ C(ln(R))^3
+where
+
+	T is the temperature (in kelvins),
+	R is the resistance at T (in ohms)
+	A, B and C are the Steinhart�Hart coefficients, which are characteristics specific to the bulk semiconductor material over a given temperature range of interest.
+ 
+        
+    To set up for the Steinhart-Hart model, we must find three reference temperatures. First, find the temperature range 
+	of the desired thermistor and take note of it. Our first reference temperature will be the lowest temperature in the 
+	range. The second reference temperature is somewhere close to the middle of the range and is usually the standard 
+	temperature 25�C. The third reference temperature is the highest temperature in the thermistor�s range. After noting 
+	these temperatures, we find their corresponding resistance values. These are either listed in the thermistor�s datasheet, 
+	or we source a temperature and measure the thermistor�s resistance at each of these points. 
+	
+	With this script you are limited to one model of thermistor (TDK B57164K, R25 = 2.2K) but you can start from this script and define as much variables 
+	as you want to define dedicated thermistor's curve. 
+	
+	This script measure two thermistors 2.2K TDK B57164K on channels 111 and 116 from a DAQ6510's 7700 card. 
+	One Type K thermocouple is used on channel 112 to check the good results from channels 111 and 116.
+	  
+--]]
+
+-- This function resets commands to their default settings and clears the buffers.
+reset()
+
+-- Set up temperature values (choose value a, b and c)
+	t1Val = -55		-- For example, extracted from the thermistors 2.2K TDK B57164K's datasheet, it was choosed -20�C for t1Val, t1Val = -20. 
+	t2Val = 25		-- For example, extracted from the thermistors 2.2K TDK B57164K's datasheet, it was choosed -20�C for t1Val, t1Val = 25.
+	t3Val = 125 		-- For example, extracted from the thermistors 2.2K TDK B57164K's datasheet, it was choosed 100�C for t1Val, t1Val = 100.
+
+-- Convert t1Val, t2Val and t3Val values from �C into Kelvin.
+t1Val = t1Val + 273.15	
+t2Val = t2Val + 273.15
+t3Val = t3Val + 273.15
+
+-- Set up resistance values	(choose value x, y and z).
+-- x, y and z value are resistance values measured respectively at a, b and c temperatures
+r1Val = 963000		-- For example, extracted from the thermistors 2.2K TDK B57164K's datasheet, it was calculated at -20�C for t1Val, r1Val = 19479.02 Ohms
+r2Val = 10000		-- For thermistors commonly used in industry, the typical reference temperature is 25�C, and for this temperature the thermistor's R25 resistance is determined. Here R25 = 2.2KOhms.
+r3Val = 165.3		-- For example, extracted from the thermistors 2.2K TDK B57164K's datasheet, it was calculated at 100�C for t1Val, r1Val = 135.55 Ohms
+
+-- Deriving Steinhart-Hart Coefficients	
+x1 = 1/t1Val
+x2 = 1/t2Val
+x3 = 1/t3Val
+
+y1 = math.log(r1Val)
+y2 = math.log(r2Val)
+y3 = math.log(r3Val)
+
+C = ((x3*(y1-y2)) - (x1*(y1-y2)) + (y1*x1) - (y1*x2) - (y3*x1) + (y3*x2)) / ( ((y3^3)*(y1-y2)) - (y1*(y2^3)) + (y1^4) - ((y1^3)*(y1-y2)) + (y3*(y2^3)) - (y3*(y1^3)) )
+B = (x1 - x2 + (C*(y2^3)) - (C*(y1^3))) / (y1-y2)
+A = x2 - (B*y2) - (C*(y2^3))
+
+-- Configure the DAQ6510 for channels 111, 112 and 116. 
+-- Set up 2W Resistance measurement on channels 111 and 116 where thermistors is connected.
+-- Set up Temperature measurement on channel 112 (TCK, internal reference junction).
+
+channel.setdmm("111", dmm.ATTR_MEAS_FUNCTION, dmm.FUNC_RESISTANCE)
+
+channel.setdmm("112", dmm.ATTR_MEAS_FUNCTION, dmm.FUNC_TEMPERATURE,
+dmm.ATTR_MEAS_THERMOCOUPLE, dmm.THERMOCOUPLE_K,
+dmm.ATTR_MEAS_REF_JUNCTION, dmm.REFJUNCT_INTERNAL)
+
+channel.setdmm("116", dmm.ATTR_MEAS_FUNCTION, dmm.FUNC_RESISTANCE)
+
+-- This attribute determines which channels are set to be watch channels on the front panel.
+display.watchchannels = '111:116'
+
+-- This function creates a user-defined reading buffer names buffer, create custom unit of measure for use in buffer1
+buffer1 = buffer.make(1000, buffer.STYLE_WRITABLE)
+buffer.unit(buffer.UNIT_CUSTOM1, "dC")
+
+-- This attribute sets the number of times the scan is repeated.
+scanCount = 10
+
+-- This function delays the execution of the commands that follow it.
+channelDelay = 1
+
+-- This command opens the specified channels and channel pairs.
+channel.open("allslots")
+
+-- Do the scan thanks to a 'for' loop. Measure channels 111, 112 and 116 and save data into buffer1 
+
+for i = 1,scanCount do
+	-- Take one measurement per channel closure
+	dmm.measure.count = 1
+	channel.close("111")
+	-- Read measurment from default buffer
+	reading, seconds, fractional = dmm.measure.readwithtime(defbuffer1)
+	-- Use Steinhart-Hart equation to convert reading in ohms value into temp
+	reading = 1 / ( A + (B*math.log(reading)) + (C*((math.log(reading))^3)) )  -- temp in kelvin
+	-- Convert Kelvin into �C
+	reading = reading - 273.15
+	-- Establishes settings for custom buffer
+	buffer.write.format(buffer1, buffer.UNIT_CUSTOM1, buffer.DIGITS_3_5)
+ 	-- Writes reading to custom buffer
+	buffer.write.reading(buffer1, reading, seconds, fractional, 0, "111")
+	channel.open("111")
+	--This function delays the execution of the commands that follow it
+	delay(channelDelay)
+
+	-- Take one measurement per channel closure
+	dmm.measure.count = 1
+	channel.close("112")
+	-- Read measurment from defualt buffer
+	reading, seconds, fractional = dmm.measure.readwithtime(defbuffer1)
+	-- Establishes settings for custom buffer
+	buffer.write.format(buffer1, buffer.UNIT_CUSTOM1, buffer.DIGITS_3_5)
+ 	-- Writes reading to custom buffer
+	buffer.write.reading(buffer1, reading, seconds, fractional, 0, "112")
+	channel.open("112")
+	--This function delays the execution of the commands that follow it
+	delay(channelDelay)
+
+	-- Take one measurement per channel closure
+	dmm.measure.count = 1
+	channel.close("116")
+	-- Read measurment from default buffer
+	reading, seconds, fractional = dmm.measure.readwithtime(defbuffer1)
+	-- Use Steinhart-Hart equation to convert reading in ohms value into temp
+	reading = 1 / ( A + (B*math.log(reading)) + (C*((math.log(reading))^3)) )  -- temp in kelvin
+	-- Convert Kelvin into �C
+	reading = reading - 273.15
+	-- Establishes settings for custom buffer
+	buffer.write.format(buffer1, buffer.UNIT_CUSTOM1, buffer.DIGITS_3_5)
+ 	-- Writes reading to custom buffer
+	buffer.write.reading(buffer1, reading, seconds, fractional, 0, "116")
+	channel.open("116")
+	--This function delays the execution of the commands that follow it
+	delay(channelDelay)
+end