{"id":2283,"date":"2011-04-19T21:52:00","date_gmt":"2011-04-19T21:52:00","guid":{"rendered":"http:\/\/www.pa4tim.nl\/?p=2283"},"modified":"2013-12-13T14:42:23","modified_gmt":"2013-12-13T14:42:23","slug":"hp-4440b-condensator-bank","status":"publish","type":"post","link":"https:\/\/www.pa4tim.nl\/meetapparatuur\/hp-4440b-condensator-bank\/","title":{"rendered":"HP-4440B decade capacitor"},"content":{"rendered":"

\"HP-4440B\"<\/a><\/p>\n

\n
HP-4440B condensatorbank<\/dd>\n<\/dl>\n

This is a small decade\u00a0capacitor made by HP. It is adjustable between 40 pF and 1.2 uF.<\/p>\n

This is not just a capacitor substitution box , it also can be used as transfer standard. It\u00a0is \u00a00.25% accurate +\/3 pF. The capacitance residu is 1 pF. To measure it correct it has a 3 terminal connection.\u00a0 I have tested it with some LCR meters and a vna to see how high it goes and it was still spot on and usable upto 40 MHz (much better as the specs, but, hey, it’s HP so no supprise).<\/p>\n

There is a cabinet in the cabinet and that is connected to\u00a0 the outer cabinet for 2 wire or disconnected from the outer cabinet for use with 3 wire measurenments.<\/p>\n

The real beauty is inside. All high quality mica and aircaps:<\/p>\n

\"\"<\/a>

Binnenkant, zucht… wat mooi<\/p><\/div>\n

They look a bit grey on the picture but that is not how it is, you need sunglasses to look at them so nice and shiny. A mirror would get a minority complex from it. Down here a copy from the 1973 catalog. Mine comes from a cal lab and is bought there in the late 70’s and not used for over 30 years after the lab closed (but all gear stayed there)<\/p>\n

\"\"<\/a>

Specs uit HP catalogus (1973)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

HP-4440B condensatorbank This is a small decade\u00a0capacitor made by HP. It is adjustable between 40 pF and 1.2 uF. This is not just a capacitor substitution box , it also can be used as transfer standard. It\u00a0is \u00a00.25% accurate +\/3 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[29,9,16],"tags":[],"class_list":["post-2283","post","type-post","status-publish","format-standard","hentry","category-calibratie","category-meetapparatuur","category-diverse-meetapparatuur"],"_links":{"self":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/2283","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/comments?post=2283"}],"version-history":[{"count":4,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/2283\/revisions"}],"predecessor-version":[{"id":2290,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/2283\/revisions\/2290"}],"wp:attachment":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/media?parent=2283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/categories?post=2283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/tags?post=2283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}