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Chapter 4, Periodic Adjustments
Introduction
N:\mkt\MANUALS\HP8924C\ALR\per_adj.fb
Audio Analyzer 1 Offset
Two DC offsets are measured and downloaded as calibration factors to the Audio
Analyzer 1 assembly:
1. Input Select Switch grounded
2. Audio Input selected with return conductor grounded
Variable Frequency Notch Filter
The calibration factors for tuning the variable-frequency notch filter are
determined: The input to the filter is set to 10 evenly-spaced frequencies between
300 and 10 000 Hz. The DAC that tunes the notch filter is adjusted for best null of
the tune error voltage. From this data, three coefficients of a parabola which best
fit the tuning data are calculated using a least-squares curve fit. The coefficients
are then downloaded into the Test Set’s non-volatile memory.
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 ...