2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDC

2.3

 

 

 

 

 

 

 

 

 

 

 

 

 

4.5

2.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

4.0

 

1

2

3

4

5

6

7

8

9

10

 

 

 

 

 

 

 

 

 

 

X 10-2

Torr

 

 

 

 

 

 

 

 

 

 

 

0.5 VDC Linear per Decade

 

 

 

 

 

 

3.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDC

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0E-5

1.0E-4

1.0E-3

1.0E-2

1.0E-1

1.0E+0

1.0E+1

1.0E+2

1.0E+3

Pressure(Torr)

MODEL 2002 Analog Output

Figure 4.1

VDC (volts) -vs- Pressure (Torr)

4.3 TTL Outputs

TTL outputs are provided for process control. High and Low set points are entered on the front panel (see Section 3.4) andTTL signals are generated on the I/O cable in the following manner:

1)When the pressure as indicated by the Model 2002 is above the High set point, the High signal line (pin #3) will be set to aTTL high level (+5VDC). When the indicated pressure

is below the High set point, the High signal line (pin#3) will be set to a TTL low level (+0VDC).

2)When the pressure as indicated by the Model 2002 is below the Low set point, the Low signal line (pin #4) will be set to aTTL high level (+5VDC). When the indicated pressure is above the Low set point, the Low signal line (pin #4) will be set to a TTL low level (+0VDC).

TheseTTL signals are used for a variety of applications. With these signals, the user has the capability to turn off/on various equipment such as valves, flow controllers, pumps, heaters, and safety equipment.

Model 2002 page 19

Page 19
Image 19
Teledyne instruction manual Model 2002 Analog Output, TTL Outputs

2002 specifications

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