Script to measure resistance within a tolerance

[florentin.westermann]

I want to write a test script on my DMM6500 with which I can measure if the resistor is within a tolerance. The tolerance is given by poslimit and neglimit, and I am using an if together with and for a PASS. However, the display never changes when the resistance is within those limits.
What am I doing wrong?

here's my code:

Code: Select all

local resi
local poslimit = 1515
local neglimit = 1485

reset()

--Set the measure function to 2-wire resistance
dmm.measure.func = dmm.FUNC_RESISTANCE
--Set the measure function to 4-wire resistance
--dmm.measure.func = dmm.FUNC_4W_RESISTANCE
-- Set the number of power line cycles 1 PLC
dmm.measure.nplc = 1
-- Immediately update autozero reference measurements and then disable the autozero function
dmm.measure.autozero.once()
-- Enable offset compensation for more accurate resistance reading
--dmm.measure.offsetcompensation.enable = dmm.ON

display.changescreen(display.SCREEN_USER_SWIPE)

while true do

display.settext(display.TEXT1, "FAIL")

resi = dmm.measure.read()

if (resi > neglimit and resi < poslimit) then

display.settext(display.TEXT1, "PASS")
--beeper.beep(0.05, 2400)

else

display.settext(display.TEXT1, "FAIL")
delay(0.1)

end
end