Measuring apparatus providing separate analog and digital output

Details Measuring apparatus providing separate analog and digital output Measuring apparatus providing separate analog and digital output

1977-11-14

1978-10-03

Swisher, S. Clement

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01K 722

Patent

active

041177223

ABSTRACT:
A capacitive integrator passes a current through a non-linearity compensating transistor, a thermistor, and an analog output amplifier and resistor so that the value of the current and the value of the voltage across the resistor are proportional to the thermistor temperature. A comparator detects each passage of the integrator output voltage above zero, and causes the output of a flip-flop to go high upon such passage for a fixed time period during which an opposing current is passed through the integrator capacitor to drive the integrator output voltage below zero. The resulting pulses in the flip-flop output are counted by a presettable counter for a predetermined counting period to give a count which is proportional to the thermistor current and temperature. This count is decimally displayed and is made numerically equal to the thermistor temperature according to any desired temperature scale by suitably selecting the length of the counting period and the preset count of the counter.

REFERENCES:
patent: 3829852 (1974-08-01), Nilsson et al.
patent: 3842371 (1974-10-01), Kelley
patent: 3911374 (1975-10-01), Busse
patent: 3939459 (1976-02-01), Hoopes
patent: 3999123 (1976-12-01), Thoener
Considine, D. M.; Process Instruments and Controls Handbook, 2nd Ed., McGraw-Hill, 1974, pp. 2-50 & 2-51.

Affiliated with

Also associated with

Rating

Measuring apparatus providing separate analog and digital output does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Measuring apparatus providing separate analog and digital output, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring apparatus providing separate analog and digital output will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1796123