Vaisala DMP248 Servisní příručka stáhnout pdf (Strana 71)

CHAPTER 6_______________________________________________________________ CALIBRATION

VAISALA _________________________________________________________________________ 65

• the LED on the left flashes; set the low end of channel 2 with the

arrow keys and press ENT

• the second LED from the left flashes; set the high end of channel 2

with the arrow keys and press ENT

The analogue outputs are calibrated to ensure that outputs are

correctly scaled: for example, when the output is scaled to 4...20 mA,

the low end of the scale is 4 mA and high end 20 mA exactly.

However, when 0... 20 mA output is used, the output can not be

adjusted to exactly 0 mA, but to 50 µA. When 0...1 V, 0...5 V or 0...10

V output is in use, the output is adjusted to 50 mV. The following

table summarizes the correct output values.

TABLE 6-2 Summary of the correct output values

Output scale:

0...20 mA 4...20 mA 0...1 V 0...5 V 0...10 V

low end: 50 µA 4 mA 50 mV 50 mV 50 mV

high end: 20 mA 20 mA 1 V 5 V 10 V

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 144 145

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Vaisala DMP248 Servisní příručka Strana 71