--- a/content/hp8662a_3.rst Thu Nov 05 22:14:33 2020 +0100 +++ b/content/hp8662a_3.rst Thu Nov 05 22:15:16 2020 +0100 @@ -11,7 +11,7 @@ This is the part 3 on my series about my HP 8662A Signal Generator, and is about the third main problems I found with this unit, as evocated in `part -2 <{static}hp8662a_2.rst>`_: Error 04 is lit and there are some very +2 <{filename}/hp8662a_2.rst>`_: Error 04 is lit and there are some very unpleasant spectrums at some frequencies. @@ -24,7 +24,7 @@ procedure to follow in on the Service Sheet H. The general block diagram of this section is as follow: -.. image:: {static}images/hp8662a/LF_block_diagram.png +.. image:: {static}/images/hp8662a/LF_block_diagram.png :class: image-process-large-photo This Low Frequency Section consists in no less than 4 phase locked loops in @@ -37,23 +37,25 @@ consists in 11 digits, named DF0 to DF10, which are segmented to control several sets of PLLs: -:DF0 - DF2: are the fractional part of the fractional N-Loop (.1Hz, 1Hz and - 10Hz digits), - -:DF3 - DF5: are the integer part of the fractional N-loop (100Hz, 1kHz and - 10kHz resolutions) - -:DF6 - DF7: are used to set the pretune VCO value for the sum loop VCO (A3A7), - the FM sum loop VCO (A3A8) as well as the N-Loop VCO (A3A4). These - are the 0.1MHz and 1MHz resolution digits. - -:DF8 - DF9: these control the high frequency section (DF10 can only be 0 or 1, - in which case the frequency doubler is used). +========= ===================================================================== +:DF0-DF2: are the fractional part of the fractional N-Loop (.1Hz, 1Hz and + 10Hz digits), +--------- --------------------------------------------------------------------- +:DF3-DF5: are the integer part of the fractional N-loop (100Hz, 1kHz and + 10kHz resolutions) +--------- --------------------------------------------------------------------- +:DF6-DF7: are used to set the pretune VCO value for the sum loop VCO (A3A7), + the FM sum loop VCO (A3A8) as well as the N-Loop VCO (A3A4). These + are the 0.1MHz and 1MHz resolution digits. +--------- --------------------------------------------------------------------- +:DF8-DF9: these control the high frequency section (DF10 can only be 0 or 1, + in which case the frequency doubler is used). +========= ===================================================================== Here is a more detailed vue of the block diagram of the low frequency section: -.. image:: {static}images/hp8662a/sheet_H.png +.. image:: {static}/images/hp8662a/sheet_H.png :class: image-process-large-photo