Yokogawa Removable Chassis DX1000N - Manual (Page 12)

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IM 04L41B01-01E
Overview of Functions
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App
Index
1.1 Input Section
Measurement Channel
• Number of Measurement Channels and Scan Interval
The DX samples the input signals on the measurement channels at the scan interval
to obtain the measured values. The table below shows the relationship between the
number of measurement channels and the scan interval.
DX1002, DX1002N
DX1004, DX1004N
DX1006, DX1006N
DX1012, DX1012N
25 ms 125 ms, 250 ms
2 s, 5 s 125 ms 1 s, 2 s, 5 s
2
4
6
12
Fast Sampling Mode * Normal Mode
No. of
Measurement
Channels
Model
Scan Interval
A/D Converter Integration Time 60 Hz/50 Hz/100 ms 60 Hz/50 Hz 600 Hz (fixed)
* When using the multi batch function (/BT2) the DX do not have a fast sampling mode.
For the setting procedure, see section 3.1.
• Integration Time of the A/D Converter
The DX uses an A/D converter to convert the sampled analog signal to a digital
signal. By setting the integration time of the A/D converter to match the time period
corresponding to one cycle of the power supply or an integer multiple of one cycle, the
power supply frequency noise can be effectively eliminated.
• Because 100 ms is an integer multiple of 16.7 ms and 20 ms, this setting can be used to
eliminate the power frequency noise for both frequency, 50 Hz and 60 Hz.
• In fast sampling mode, the performance of eliminating power frequency noise is worse than in
normal mode. We recommend that you use normal mode when making measurements in an
environment affected by power frequency noise.
For the setting procedure, see section 3.1.
Input Type and Computation
You can make measurements using the following input types.
Input Type Description
DC voltage You can measure DC voltages in the range of ±20 mV to ±50 V.
DC current You can measure a DC current signal by converting it to a voltage signal using
a shunt *1 resistor attached to the input terminal.
The converted signal can be measured within the DC voltage range (see above).
Thermocouple You can measure temperatures corresponding to these thermocouple types:
R, S, B, K, E, J, T, N, W, L, U, and WRe3-25.
It is also possible to measure using other thermocouples, such as PR40-20 and
PLATINEL.* 2
RTD You can measure temperatures using RTD types Pt100 and JPt100.
It is also possible to measure using other RTD types such as Cu10, Cu25,* 3
Pt50, and Ni100.* 2
ON/OFF input You can display contact input or voltage input signals correlated to 0% or 100%
of the display range.
Contact input: A closed contact is on (1). An open contact is off (0).
Voltage input: Less than 2.4 V is off (0). 2.4 V or more is on (1).
Pulse input* 4 You can count pulses.
*1 Item sold separately. For example, you can use a 250-Ω shunt resistor to convert a
4- to 20-mA signal to a 1- to 5-V signal.
*2 /N3 option
*3 /N1 option
*4 /PM1 option
Chapter 1 Overview of Functions