Yokogawa DA100 - Manual (Page 68)

IM DA100-01E 3-9
3
Trouble-shooting and Maintenance
3.4 About Maintenance and Calibration
Since the DA100 Acquisition Unit (hereafter referred to as DA100) has no parts which are subject
to wear, periodical replacement of parts is not necessary. However, we recommend to inspect the
operation conditions periodically.
About Fuse Replacement
Although the DA100 is equipped with a built-in fuse, replacement of a blown fuse may not be
carried out by the customer himself. For replacement of the fuse, contact your nearest sales
representative. Addresses may be found on the back cover of this manual.
About Calibration
We recommend to calibrate the DA100, as described below, at least once a year to assure the
measurement accuracy.
Required Equipment
Name Measurement Accuracy Recommended
Range
DC Voltage Generator 0V to 50V 0.005% of setting + 1
µV Yokogawa 9000*, 4808
DMM 0V to 50V 0.005% of setting + 1 µV HP3458A
Decade Resistance Box 0.1 Ω to 1000 Ω 0.01% Yokogawa 2793
DC Current Gemerator 0 mA to 20 mA 0.05% of setting Yokogawa 7651
* For 0V input, it is necessary to either short the input terminals, or to monitor the output voltage using the
DMM.
Calibrating Conditions
Ambient temperature : 23
°C ±2°C
Ambient humidity : 55
±10%RH
AC power supply voltage : 100 to 240 VAC (AC power supply model)
DC power supply voltage : 12 to 28 VDC (DC power supply model)
Power supply frequency : 50/60 Hz ±1% (AC power supply model)
Warm-up time : at least 30 minutes for the DA100, and necessary warm-up time for
the used equipment
Connection
DC Voltage Measurement
+ -
DC Voltage Generator
Input terminal
Temperature Measurement Using RTD
B b A
Decade Resistance Box
Input terminal