YOKOGAWA MX100 User Manual

1-7
IM MX100-01E
Explanation of Functions
3
2
1
4
5
Index
Measurement Time (When Using the MX100 Standard Software)
When a measurement start request or a measurement data output request is made by
a PC to the main module, the PC’s time information is transmitted to the main module.
The main module generates measurement time using the internal clock based on the
time when the measurement start request is received. When the measured data is sent
to the PC, the PC’s time information along with the measurement time information on
the main module is returned to the PC. The time information used in the monitoring
of the measured data on the PC is that of the main module. When measurement is
made over an extended time, the time between the PC and main module may be
misaligned (up to 60 seconds in one week excluding the accuracy of the PC clock). As
a remedy to this problem, when the measured data is recorded (saved) on the PC, the
PC’s time information is stored along with the measurement time information on the
main module. When the Viewer of the MX100 Standard Software is used to open the
recorded measurement data, the “time synchronization” function can be used to correct
the measurement time relative to the PC’s time based on the PC’s time information.
For details on the time synchronization function, see the Technical Information, “MX100
Performance Specifications” (TI 04M08B01-00E). For information on obtaining a copy,
contact your nearest YOKOGAWA dealer.
Filters
The main module is equipped with a first-order lag filter (see section 2.7, “Measures
against Noise on the MX100 Data Acquisition Unit”. You can select a time constant (time
until63.2%oftheoutputvalueisreached)correspondingtothemeasurementinterval
indicated in the equation below.
Time constant
= measurement interval × N (where N = 5, 10, 20, 25, 40, 50, or 100)
Computation
Difference computation between channels and linear scaling are possible. Linear scaling
converts the measured values to values suitable for a particular purpose (scaled values)
using the following equation.
Scale value =
(X – SP
min
) × (SC
max
– SC
min
)
SP
max
– SP
min
+ SC
min
X: Measured value
SP
max
: Specified span maximum
SP
min
: Specified span minimum
SC
max
: Specified scale maximum
SC
min
: Specified scale minimum
Remote RJC
When the item to be measured is located at a great distance, you can setup relay
terminals near the item, measure between the relay terminal and the input terminal of the
universal input module (reference channel) using thermocouples, and use the resultant
value as the reference junction compensation of the temperature measurement. By
connecting the relay terminal and the input terminal of the universal input module using
copper wires and connecting the item to be measured and the relay terminal using
thermocouples, you can make temperature measurements without having to use large
quantities of high-cost thermocouples.
1.2 Main Module Functions

YOKOGAWA MX100 Specifications

General

Brand	YOKOGAWA
Model	MX100
Category	Data Loggers
Language	English