Teledyne 200AH 用户手册

 

Table 7-10:  Calibration Requirements for AutoRange or Remote Range 
No matter which calibration method you choose from this chapter, all of the following 
parameters must be set to properly calibrate the instrument on AutoRange or Remote range. 

Range 

Low Range is selected by pressing 
CONC-LO on the front panel. 

High Range is selected by pressing 
CONC-HI on the front panel. 

Slope NO

X

 and NO slopes for low range 

are set by span calibration. 

NO

X

 and NO slopes for high range 

are set by span calibration. 

Offset NO

X

 and NO offsets for low range 

are set by zero calibration. 

NO

X

 and NO offsets for high range 

are set by zero calibration. 

Converter Efficiency 

CE can be set by one of the 
procedures in Section 7.11. 
Converter efficiency is optional. 

CE can be set by one of the 
procedures in Section 7.11. 
Converter efficiency is optional. 

 

In Independent Range mode there is one set of calibration parameters. That is, NO

X

 and NO 

slopes and NO

X

 and NO offsets, and one converter efficiency parameter. The calibration of the 

M200AH using independent range is the same as calibration in single range. To achieve 
independent ranges, the computer scales the 3 outputs using the ranges keyed in by the operator. 

After calibration is complete, it is very important to check the QUALITY of the calibration. The 
calibration of the M200AH involves balancing several sections of electronics and software to 
achieve optimum accuracy, noise, linearity and dynamic range. 

The slope and offset parameters are similar to the span and zero pots on an analog instrument. 
Just as in the analog instrument, if the slope or offset get outside of a certain range, the 
instrument will not perform as well. 

The slope value will be slightly different on the NO and NO

X

 channels. This is due to slight 

differences in pneumatic resistance in each pathway. If the slopes are significantly different, 
there is a calibration error or a cross port leak in the switching valve. If there is a sudden change 
in slopes after a calibration, that usually indicates a change in reaction cell pressure. Check the 
Troubleshooting Section 9. 

The offset value gives information about the background signal level. Check the observed offset 
value against the factory value in Table 2-1. If significantly higher, check Section 9.1.6. 
Increasing readings are a predictor of problems.