MEMS AH1000 Test Knowledge Flashcards
How frequent does the body rate monitor test take data? Where is it located?
1 second worth of data. The data is located in the device SN directory. With the file name called “filtered_ARINC_ATP_RCD_DATE_TIME”
What files does the ETS group looks at when troubleshooting test equipment?
The results files in the device SN directory
What is room ATP? What are some characteristics of the test?
Also known as quick ATP
- Just a functional test (should operate this way and does not need calibration)
- no rotation tests
-used for troubleshooting
-test operates at different voltages
- can be ran on HASS and rate table
What can the ATP also be named as?
Performance test
Why is integration ran before CAL?
Running integration means there are no cal coefficients, so calibration has to be run
Why does the “NVM_Aircraft_install_data_update” appear in the fault log? Do we count this as failure when we do ATP in house?
-When a device is installed in a new airplane or tester (which has APMs)
-We count this as failure if we do an ATP
What other RG event log faults do we ignore and why?
Faults that say “IGNORED”
Magnetometer faults
-The magnetometer is not our issue since Olathe makes them
Heading mode faults
-Field strength is low in areas
What is the easiest way to find the order of power cycles in the RG Dump?
-There is an upper limit in power cycles
-Higher faults are the latest faults and lower faults are the older faults
-We clear the event log before testing (in tests we power cycle 20 times and we start at 0)
What is different between the HG2205AB02 and HG2205AB03 tests at integration?
Gyro config file is different between an HG2205AB02 and HG2205AB03
-Filtering values
-They loaded at integration test
What is the No Accel Bias transient test parameter at integration?
It is the expected the accel bias transient to change to a certain degree in 20 minutes
What are two charts to look at after calibration is finished?
The rate bias poly chart and rate bias look up table
How do I access the calibration charts?
You can’t access the charts but you can access the raw data to plot the charts.
- Go to the engineering tab on the device directory
- Go to the cal_eval_tool folder and copy sn_56xxxx_avg_coeff.xlsx (2018 version)
- Go back to the device serial no. directory and open the latest calibration folder
- Paste into latest cal folder
- Click on the latest avg coeff file (SN_56XXX_Date_Time_AVG_COEFF.txt)
- Copy all the values
- Access the pasted excel file in the cal folder and paste the values in the “Coeff Entry” tab
- Click on the “RateBiasPolyChart” to access the rate bias raw polynomial fit chart
- Click on “RateBiasLUTChart” to access the Rate Bias Look-Up- Table
What does Tim refer to as Swapped axis?
Need more clarifcation on this but the test equipment writes the APM
How did Tim describe the x and y gyro performance at calibration?
-There are in the x and y accel axis (should be seeing 0 G)
-Box real time bias estimator uses those accels
-Cal failures that usually point their coefficients being the biggest
Why is ATP in the UG8000 (8 hrs) longer than the UG7000 (5 hrs)?
The UG7000 has 2 slots while the UG8000 has 4 slots
