Yokogawa DR240 - Manual (Page 41)

2-20 IM DR231-01E
2.6 Other Functions
Carrying Handle (Option)
A carrying handle is available as an option for the stand-alone model DR231 for making transport
of the instrument easier.
FDD (DR130-1, DR231-1, DR241-1)
This function enables saving/reading of measured data, computed data and set-up data for SET
mode to/from the internal RAM disk, and saving/reading of set-up data for SET and SETUP
modes to/from a floppy disk.
This also allows you to use events provided by the event/action function as a trigger to save/
retrieve measured/computed data to/from the internal RAM or retrieve set-up data when an event
takes place.
Computation Function (Option)
This function is available if the instrument is equipped with the computation function (/M model).
This function executes the following computations, and displays and records the results.
Four arithmetical operations (addition, subtraction, multiplication, division), square root, absolute
values, common logarithm, natural logarithm, power, logical product, logical sum, exclusive OR,
logical negation, statistical operation, relational operation
Up to 30 channels can be used for computation. It is also possible to use the event/action function
to start/stop computation or clear data for computation channels. Furthermore, up to 4 levels of
alarm (upper-limit alarm, lower-limit alarm) can be set for computation channels.
RRJC (Remote RJC, available if the instrument is equipped with the optional MATH
function)
In cases where the object is located in distance for temperature measurement using
thermocouples, the temperature of the object can be measured without using a number of
expensive thermocouples if a junction terminal is installed near the object. This method requires
the object to be connected to the terminal via a thermocouple, and the terminal to this instrument
via copper lead wires. Furthermore, the junction terminal needs to be connected to an input
terminal of this instrument via a thermocouple. The temperature of the junction terminal is then
measured to carry out compensation for the reference contact point used for measurement of
temperature of the object, then finally temperature of the object is measured.
This instrument
Input
terminals
Thermocoupler*
Copper lead wire
Copper lead wire
Thermocoupler*
Thermocoupler*
Junction terminal
(to be provided by the customer)
Reference channel
* Thermocouplers of the same type must be used
Computing & Report Function (Option)
This function can print the results of a statistical calculation of data on a specified channel
(measurement or computation channel), in a format predetermined for a preset time, date or
month, or send out the results to a communication line. The types of computations are averaging
(mean value, maximum and minimum), instantaneous value calculation and summation (sum,
cumulative sum).