Teledyne Tablet Accessory T803 Manual De Usuario

Teledyne API T803 CO2/O2 Analyzer Operation Manual 

Setup Menu 

 

5.10.3.5. MANUAL ADJUSTMENT OF CURRENT LOOP OPTION OUTPUT SPAN AND 

A current loop option may be purchased for the A1, A2 and A3 analog outputs of 
the analyzer.  This option places circuitry in series with the output of the A-to-D 
converter on the motherboard that changes the normal DC voltage output to a 0-
20 milliamp signal (See Section 3.3.1.4).   

  The outputs can be ordered scaled to any set of limits within that 0-20 mA 

range, however most current loop applications call for either 0-20 mA or 4-20 
mA range spans.   

  All current loop outputs have a + 5% over range.  Ranges whose lower limit is 

set above 1 mA also have a 5% under range. 

To switch an analog output from voltage to current loop, follow the instructions 
in Section 5.10.2 (select CURR from the list of options on the “Output Range” 
menu). 

Adjustment of the signal zero and span levels of the current loop output is done 
by raising or lowering the voltage output of the D-to-A converter circuitry on the 
analyzer’s motherboard.  This raises or lowers the signal level produced by the 
current loop option circuitry. 

The software allows this adjustment to be made in 100, 10 or 1 count increments.  
Since the exact amount by which the current signal is changed per D-to-A count 
varies from output-to-output and instrument–to–instrument, you will need to 
measure the change in the signal levels with a separate, current meter placed in 
series with the output circuit.  See Figure 3-7 for pin assignments and diagram of 
the analog output connector. 

 

 

07276B DCN6418