Teledyne Vacuum Gauge 2002 Instrukcja Użytkownika Pobierz pdf (Strona 38)

page 38 Model 2002

8.2 Operation

The 4-20 mA output option board provides dual channel current output linearly proportional to

the HPM 2002’s pressure reading. The first channel corresponds to the higher pressure range (0-

1024 Torr). The second channel corresponds to the lower pressure range (0-1000mTorr). The

equations below give the output currents for a given pressure:

Note that for both channels, the output is always between 4mA and 20mA. Specifically, when the

pressure is below 1 Torr, channel 1 current will be approaching 4mA. Also, when the pressure is

above 1 Torr channel 2 current will be saturated at 20mA.

Channel 1Channel 2

Internal loop

power out

Loop in

Internal loop

power out

Loop in

Figure 8.2

16mA

1000 mTorr

I(Channel 2) = 4 mA + (P(mTorr))* ( )

16mA

1024 Torr

I(Channel 1) = 4 mA + (P(Torr))*

( )

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 53 54

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Teledyne Vacuum Gauge 2002 Instrukcja Użytkownika Strona 38