Answer / carl_ellis

Analog output trim is done on all process field
transmitters that do not communicate over a digital
protocol like Profibus or Foundation Fieldbus.

Modern electronics use an A/D to digitize a value from a
sensor, a microprocessor to process the value and a D/A to
output the process value as an analog signal.

Adjusting the zero and span of the D/A is commonly
called 'trim'. It trims the D/A output a small amount,
generally about ±1% at the zero and at the span
(separately), generally to match a variation or deviation
of an analog input's resistance value.

Trim is NOT setting the URV and LRV values to correspond to
process inputs, as was once done with analog electronic
transmitters.

Carl Ellis
Measure First

What are the disadvantages of Human-Machine Interface (HMI)? atleast 3.

1 Answers  

---

why the supply frequency used in America is 60Hz while that used in India is 50Hz?,

2 Answers   Bosch, Genco,

---

how many type conductivity sensor ?

0 Answers   Process Automation,

---

how to do loop checking pls email to shanavaska2000@yahoo.com

2 Answers   Kentz,

---

How to calibrate Magnetic flow Transmitter in Field

0 Answers  

---

Why use ball valves on Gas pipelines instead of gate & or globe valves...means basic diffrence or use of these valves..how designers knows this type of valve with rating is required...

0 Answers   Adgas, GAIL, Oil India, ONGC,

---

if my flow is 20000 m3/h than which range of DPT i have to use????

0 Answers  

---

Why the tapping connections are taking above for gas service and below for liquid service?

2 Answers   ADCO,

---

Can anyone provide me the details of GAIL test paper?What is the format and what type of questions will be there? my id-princegnb@gmail.com

1 Answers   GAIL,

---

how to do dynolab wind speed sensor loop test, how to simulate value,i have simulate mA 4-20mA but not responding in DCS faceplate, please kindly advice me any one.

0 Answers  

---

what is the difference between signal cable and ontrol cable?

14 Answers   Essar,

---

How the warning lamp of a charging-system is activated ?

0 Answers  

---