Specifications

104 Calibration and Preventive Maintenance Chapter 6
AutoAdj Test Codes and Types
The following are some of the codes that shows the mapping between the
"test number" (ID) in auto adjust and what part of the Measurement Control
Module was measured. Some of the acronyms used to identify the different
parts of the MCM in Table 6-1. Use the acronyms to determine the part of
the MCM was measured for troubleshooting purposes.
There are 43 parameters measured (ID = 0 to 42), as listed in Table 6-2. You
can use the values listed in the table to determine where the failure is located.
The most likely failures are the following:
#39: (AttnCalMid Gain) - The AutoAdj action has a parameter called "Adc
present" that should be set to 0 (zero) if no adc is present in the system. The
default is 1.
#24 - #28: (Shunt resistors) - If all these tests fail, make sure the test fixture
is removed from the system, or check for shorts between the Analog Bus
(ABus1 to ABus4) connector grounds and UUT Common.
Table 6-1. Acronyms and MCM Circuitry Locations
Acronyms
MCM Part
LVxx
Low Voltage (source)
HVxx
High Voltage
xxCV
Constant Voltage
xxCI
Constant Current
Comp
Comparator
Xfrm
transformer
DRxx
Delta Resistance (resistance differences between A
Buses)
FVMI
Force Voltage, Measure Current (an MCM internal setup)
Attn
Attenuator
Table 6-2. Parameter ID Numbers and Types
ID
# Type
Nominal
Value
Low
Value
High
Value
0 LVCV Gain 603.3e-6 0.00045 0.00075
1 HVCV Gain 3.357e-3 0.0031 0.0035
2 LVCI 200m Gain 30.17e-6 27.2e-6 33.2e-6
3 LVCI 20m Gain 3.017e-6 2.92e-6 3.12e-6
4 LVCI 2m Gain 301.7e-9 292.0e-9 312.0e-9
5 LVCI 200u Gain 30.17e-9 29.2e-9 31.2e-9
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