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551
Chapter 14, Diagnostics Descriptions
Description Of Audio Diagnostics (AFDIAGS3)
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
These fixed final settings result in nominal DVM readings of:
•
1.725 V for Paths 1.
•
3.45 V for Path 5.
•
2.16 V for Paths 6, 7, and 9.
•
0 V for Paths 2, 4, and 8.
These settings are near optimum for the devices tested. The DAC setting of 200
(which sets the gain of the two AFG level amplifiers) is the nominal maximum.
(Values between 201 and 215 are not normally used.)
The following example illustrates how the levels are determined. For Path 1:
•
AFG1 input is 1 V.
•
AFG1 Amplifier gain is 2.2 (6.85 dB).
•
AFG1 Level Amplifier gain is set to 0.784 (-2.11 dB).
•
AFG1 Attenuator 1 gain is set to 1 (0 dB).
•
Modulation Select Sum Amplifier gain is 1 (0 dB).
•
Other gains (switches and buffers) are 1 (0 dB).
Multiplying the these settings gives 1.725 V (4.74 dBV) at the input to the DVM.
The failure codes for the preliminary audio paths are as follows:
Summary of Contents for 8924E
Page 52: ...Contents 52 N mkt MANUALS HP8924C ALR 8924CE TOC A Error Messages ...
Page 53: ...Contents 53 N mkt MANUALS HP8924C ALR 8924CE TOC Index 633 ...
Page 54: ...Contents 54 N mkt MANUALS HP8924C ALR 8924CE TOC ...
Page 137: ...137 N mkt MANUALS HP8924C ALR per_adj fb 4 Periodic Adjustments ...
Page 449: ...449 N mkt MANUALS HP8924C ALR service fb 10 Service Screen ...
Page 455: ...455 N mkt MANUALS HP8924C ALR blkdia fb 11 Block Diagrams ...
Page 522: ...522 Chapter 11 Block Diagrams Assembly Details N mkt MANUALS HP8924C ALR blkdia fb ...
Page 613: ...613 N mkt MANUALS HP8924C ALR errmssg fb A Error Messages ...