COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 132
Apr. 14/16
Testing & Fault Isolation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
Figure 133. CVR Tester, Update Reference Level
(l)
Select Yes to update the audio setup reference level file with the values
displayed, or select No to cancel the update of the audio setup reference
level file.
(m) Close the Audio Reference Level menu by selecting the Close button.
(n)
Remove power from the RIU
CAUTION: Remove power from the the RIU before proceeding to the next step.
If the connector is disconnected with power applied to the RIU, the
RIU may be damaged.
(o)
Remove the Audio Setup Loop
−
Back Connector, p/n: 17TES0417.
NOTE:
This reference value will be used to adjust the audio voltages
read from the audio output of a 600 ohm recorder during CVR
tests. For example, if 1.952 Volts RMS is read from the sound
card then Correction Factor = 2.45 VRMS / 1.952 VRMS. If the
Volts RMS value read is less than 1 Volt RMS then and error
message will be displayed. In this case, verify that all of the
cables are working and are installed correctly.
NOTE:
The setup reference level file is named ri_Ref_Level.txt and is
located in the CVR Tester local subdirectory.
Sample ri_Ref_Level.txt file:
; RI Sound Card reference level
;
; REFERENCE value equals 2.45 VRMS / X VRMS read from sound card.
; Example: 1.255 VRMS REFERENCE = (2.45 VRMS/ 1.952 VRMS read from sound
; card)
; VOICE VOLUME value for Full Reference or 3 Volts RMS input to recorder
; CAM VOLUME value for Full Reference or 2 Volts RMS input to recorder
REFERENCE = 1.255
VOICE VOLUME = 9509
CAM VOLUME = 6168
The document reference is online, please check the correspondence between the online documentation and the printed version.
