Teledyne hfc-302 ユーザーズマニュアル

  

Page 14 of 31 

 

Fig. 2.8 

As the ambient temperature of 

the instrument changes from 
the original calibration 

temperature, errors will be 
introduced into the output of 

the instrument.  The 
Temperature Coefficient of 

Zero describes the change in 
the output that is seen at zero 

flow.  This error is added to the 
overall output signal regardless 

of flow, but can be eliminated 
by merely adjusting the zero 

potentiometer of the flow 
meter/controller to read zero 

volts at zero flow conditions.  
The Temperature Coefficient of 
Span describes the change in 

output after the zero error is 
eliminated.  This error cannot 

be eliminated, but can be 
compensated for 

mathematically if necessary.  
The curve pictured in Figure 2.8 

shows the span error in percent 
of point as a function of 

temperature assuming 23

0

C is 

the calibration temperature.