Yokogawa Removable Chassis DX1000N - Manual (Page 20)

3-6
SM 04L41B01-01E
Measurement Accuracy
● Overview
The measurement accuracy is tested using two different* integral times.
* But only one integral time is used when using the DX2000 with the /MC1 option.
The measurement accuracy test is performed in one of the following ways.
• One representative channel for each A/D converter is tested, and the channel-to-
channel error between the representative channel and other channels is tested (see
next page).
* Choose any channel number for each A/D from those listed in the A/D converter
configuration table.
Ex.: With the DX1004, set channels 1 and 3 as representative channels.
• The measuring accuracy of all channels is tested separately.
● A/D Converter Configuration
Models
Measurement
Interval
Number of
Channels
No. of
A/Ds
Channel Number by A/D
DX1002/DX1002N 125 ms 2CH 1 1-2
DX1004/DX1004N 125 ms 4CH 2 1-2, 3-4
DX1006/DX1006N 1 s 6CH 1 1-6
DX1012/DX1012N 1 s 12CH 1 1-12
DX2004 125 ms 4CH 2 1-2, 3-4
DX2008 125 ms 8CH 4 1-2, 3-4, 5-6, 7-8
DX2010 1 s 10CH 1 1-10
DX2020 1 s 20CH 2 1-10, 11-20
DX2030 1 s 30CH 3 1-10, 11-20, 21-30
DX2040 1 s 40CH 4 1-10, 11-20, 21-30, 31-40
DX2048 1 s 48CH 4 1-12, 13-24, 25-36, 37-48
● Test Instruments
Instrument Specifications
DC voltage generator Accuracy: ±0.005% of setting + 1 µV
DMM Accuracy: ±0.005% of rdg + 1 µV
Variable resistors Accuracy: 0.01% + 2 mΩ or better
● Setup
Set the input range of the channels under test, and the test range.
● Test Procedures
Warm up the instrument for thirty minutes before performing the test.
Enter the input value determined for each range. Check whether the displayed
measured values satisfy the reference values.
DC voltage generator
To the input
terminals
+
−
Variable resistors
The resistance of three
lead wires must be equal.
3.4 Test Procedures