示例#1
0
class TempTest(FwTest):
    Tmin = 30
    Tmax = 30 + 256 + 512 - 1

    def setUp(self):
        FwTest.setUp(self)
        count = 100
        self.Pt = Pt(1.0)

        Rmin = self.Pt.resistance(self.Tmin - 1)
        self.Rmin = self.Pt.resistance(self.Tmin)
        RmaxA = self.Pt.resistance(self.Tmax - 1)
        self.Rmax = self.Pt.resistance(self.Tmax)
        RmaxZ = self.Pt.resistance(self.Tmax + 1)
        self.R = [0.0, 0.98, 1.0, Rmin, self.Rmin, RmaxA, self.Rmax, RmaxZ]
        self.T = [0.0, self.Tmin - 0.05, self.Tmin, self.Tmax - 0.05, self.Tmax, self.Tmax + 0.05]
        random.seed()
        while count:
            count = count - 1
            self.R.append(random.random() * (self.Rmax - self.Rmin) + self.Rmin)
            self.T.append(random.random() * (self.Tmax - self.Tmin) + self.Tmin)

    def test_temp(self):
        """Test input for specified numbers"""

        for num in self.R:
            exp = 0
            if num >= self.Rmax:
                exp = 0xFFFF / 20.0
            elif num >= self.Rmin:
                exp = self.Pt.temperature(num)
            cmd = "test:temp? %i" % round(num * (2 ** 14))
            self.writeline(cmd)
            res = self.readline()
            res = int(res) / 20.0
            try:
                self.assertEqual(round(res * 20), round(exp * 20), cmd + " (res: %f exp: %f" % (res, exp))
            except AssertionError:
                x = abs(res - exp)
                self.assertLess(x, 0.05, cmd + " (res: %f exp: %f" % (res, exp))

    def test_temp_res(self):
        """Test input for specified numbers"""

        fix_point = 2 ** 14
        for num in self.T:
            exp = 0
            if num >= self.Tmax:
                exp = 0xFFFF / fix_point
            elif num >= self.Tmin:
                exp = self.Pt.resistance(num)
            cmd = "test:temp:res? %i" % round(num * 20)
            self.writeline(cmd)
            res = self.readline()
            res = int(res) / fix_point
            try:
                self.assertEqual(round(res), round(exp), cmd + " (res: %f exp: %f" % (res, exp))
            except AssertionError:
                x = abs(res - exp)
                self.assertLess(x, 0.05, cmd + " (res: %f exp: %f" % (res, exp))
示例#2
0
文件: pt.py 项目: pinkavaj/uscpi-fw
class Pt:
    "Compute resistance and temperature fot Pt conductor"

    A = 3.908e-3
    B = -5.802e-7

    def __init__(self, R0):
        self.R0 = float(R0)

    def temperature(self, R):
        "Compute temperature from resistance."
        a = 2 * self.R0 * self.B
        b = self.R0 * self.A
        c = self.R0 - R
        return ((-b) + sqrt(b ** 2 - 2 * a * c)) / a

    def resistance(self, temp):
        "Compute resistance from temperature (°C)."
        temp = float(temp)
        return self.R0 * (1 + (self.A * temp) + self.B * (temp ** 2))


###### SELF-TEST ######
if __name__ == "__main__":
    from pt import Pt

    s = Pt(10)
    print("R0 = 10{\Omega}")
    print("T = Pt(R=13) = %f" % s.temperature(13))
    print("R = Pt(T=105°C) = %f" % s.resistance(105))