Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP - Manual (Page 56)

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Table 4
Data Display Current Output (mA DC)
4 4 ±0.02
12 12 ±0.02
20 20 ±0.02
After all tests are completed,
a. Touch the [Exit] twice to return to the “Service” display.
b. Select “Normal” in “Key”.
c. Touch the [Home] icon to return to the initial display.
Figure 1 Testing Circuit and Test Equipment