--- a/content/hp34970a.rst Wed Oct 16 21:52:38 2019 +0200 +++ b/content/hp34970a.rst Wed Oct 16 21:53:47 2019 +0200 @@ -14,7 +14,7 @@ be in working condition, but the main switch unit was almost "given" with the plugin modules since it is non functional. -.. image:: {filename}/images/hp34970a/front-view.jpg +.. image:: {static}/images/hp34970a/front-view.jpg :alt: front view of the HP 34970A data acquisition unit It's in very good shape, the front panel and the push buttons are @@ -37,18 +37,18 @@ - the frontpanel and - the back plane where plugin modules are connected. -.. image:: {filename}/images/hp34970a/bottom-view.jpg +.. image:: {static}/images/hp34970a/bottom-view.jpg :alt: bottom view of the HP 34970A -.. image:: {filename}/images/hp34970a/top-view.jpg +.. image:: {static}/images/hp34970a/top-view.jpg :alt: top view of the HP 34970A with DMM removed -.. image:: {filename}/images/hp34970a/dmm.jpg +.. image:: {static}/images/hp34970a/dmm.jpg :alt: DMM module of the HP 34970A The front panel hold the keyboard, the rotary encoder and the diplay system. -.. image:: {filename}/images/hp34970a/front-panel.jpg +.. image:: {static}/images/hp34970a/front-panel.jpg :alt: front panel of the HP 34970A The front panel is managed by a 80C51 (a 87C51 actually) @@ -59,7 +59,7 @@ The chips are PLCC44 located under the VFD are the drivers: -.. image:: {filename}/images/hp34970a/front-panel-pcb.jpg +.. image:: {static}/images/hp34970a/front-panel-pcb.jpg :alt: front panel PCB of the HP 34970A On my unit, the voltage levels for the VFD are fine. I suspected that @@ -87,7 +87,7 @@ capacitors (C6, C7, C9 and C10) are a bit too close, so I had to move them. -.. image:: {filename}/images/hp34970a/front-panel-sockets.jpg +.. image:: {static}/images/hp34970a/front-panel-sockets.jpg :alt: PLCC sockets for the VFD drivers of the HP 34970A @@ -99,13 +99,13 @@ few seconds. One mst be careful not to burn them, otherwise the VFD is definitively lost. -.. image:: {filename}/images/hp34970a/vfd-back.jpg +.. image:: {static}/images/hp34970a/vfd-back.jpg :alt: back side of the VFD (probably dead) module So I tried such a rejuvenation on my VFD module. I wasn't sure what color the filaments must be heated to (between a light orange to an almost white yellow). I was doing this using my `Lambda PSU -<{filename}/LPD422FM.rst>`_ raising the voltage while looking at the +<{static}/LPD422FM.rst>`_ raising the voltage while looking at the filaments. The results are very disappointing. The VFD is a little bit brighter,