Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2
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9.3.3.1. ADC/DAC Calibration Procedure
Due to the stability of modern electronics, this procedure should only need to be performed if a
major sub-assembly is exchanged or when the display voltage does not match the input voltage
or current to the V/F card. After completion, a Factory Calibration Procedure should be
performed, see Section 9.1.6.
Before the actual calibration is performed, switches on the V/F card must be correctly set and
jumpers set on the motherboard. Jumper and switch setting changes must be performed with
the instrument power OFF.
Motherboard Jumpers
The motherboard contains 4 pairs of jumpers JP1 - JP8, one pair for each analog output channel.
Each channel can be configured for either voltage or current output. Use Table 9-7 to configure
the jumpers.
Table 9-7: Motherboard Jumper Settings
Analog Output Terminal Pair
Rear panel Jumper Pair Jumper Setting for
Voltage Mode Jumper Setting for
Current Mode
DAC 0 - NOX 3 - 4 JP3 - JP4 B - C A - B
DAC 1 - NO 5 - 6 JP1 - JP2 B - C A - B
DAC 2 - NO2
(units w/o O2) 1 - 2 JP5 - JP6 B - C A - B
DAC 2 - O2
(units with O2) 1 - 2 JP5 - JP6 B - C A - B
DAC 3 - TEST 7 - 8 JP7 - JP8 B - C A - B
V/F Board Switch Settings
There are 2 different types of current outputs, Non-Isolated (std equipment) and Isolated. Each
requires a different switch setting shown below. If you are operating the instrument in voltage
output mode, the switches should be set to the desired voltage range.
Table 9-8: V/F Board Switch Settings
DAC # Sw 1 Sw 2 Sw 3 Sw 4 Sw 5 Sw 6 Sw 7
0 ON* OFF* OFF*
1 ON* OFF* OFF*
2 ON* OFF* OFF*
3 ON* OFF* OFF*
*Required settings