Yokogawa DR240 Manual do Utilizador Página 240

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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+1µV Yokogawa 9000*, 4808
DMM 0V to 50V 0.005% of setting+1µV HP3458A
Decade Resistance Box 0.1 to 1000 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 resistance to channel 5.
BbA
Decade Resistance Box
Input terminal
(CH5)
Short-circuit the resistance input terminals A, B, and b in channel 4.
BbA
Input terminal
(CH4)
13.5 Calibration
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