Yokogawa DR240 - Manual (Page 240)

13-7 IM DR232-01E
Trouble-shooting and Maintenance
13
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 1000Ω 0.01% Yokogawa 2793
DC Current Generator 0 to 20mA 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 (the subunit of DC power supply model omly)
Power supply frequency : 50/60 Hz
±1%
Warm-up time : at least 30 minutes for this recorder, and necessary warm-up time for
the used equipment
Connection (terminal screw connections)
• DC Voltage Measurement
• Apply a rated voltage in the voltage range that is to be calibrated to channel 3.
+ –
DC Voltage Generator
Input terminal
(CH3)
• Short-circuit between “+” and “–” terminals in channel 2.
+ –
Input terminal
(CH2)
• Temperature Measurement Using RTD
• apply the 100
Ω resistance to channel 5.
B b A
Decade Resistance Box
Input terminal
(CH5)
• Short-circuit the resistance input terminals A, B, and b in channel 4.
B b A
Input terminal
(CH4)
13.5 Calibration