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mar. 27 février 2018
EIP 545B RF Frequency Counter - Part 5
Thanks to HighPrecision, I've been able to get a copy of an old version of the EIP documentation "Additional Service Information for 5XX CW Counters". It's unfortunately unavailable online, still, it contains a lot of valuable information.
The part dedicated to verifying the Band 3 Microwave Converter (A203) is as …
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jeu. 15 février 2018
EIP 545B RF Frequency Counter - Part 4
This part is about my attempt to modify the firmware to "fix" the problem of weird intial setup: a -160MHz offset and a resolution set to 5 digits.
In the previous part, we figured some probable spots in the firware where these default setup configurations might be set.
EPROM checksums …
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ven. 26 janvier 2018
EIP 545B RF Frequency Counter - Part 3
Default settings
One of the annoying thing with this 'SPECIAL' edition of the firmware are the default settings:
- Frequency Offset -160MHz
- Resolution 5 digits
One of my goals while disassembling the formware was to 'fix' these defaults settings. I was wondering wether they where located in an undocumented part of …
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sam. 20 janvier 2018
EIP 545B RF Frequency Counter - Part 2
I've started a discussion on the eevblog forum to gather a bit help for my project. And I did well since a few fellows did help me a lot on some aspects.
I have now been able to run the power meter at full resolution (even if it's very out …
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mer. 20 décembre 2017
EIP 545B RF Frequency Counter
I recently purchased a broken EIP 545B microwave frequency counter on ebay. It was very inexpensive (around 150€ delivered), but obviously, non working.
The device was described as "does not power up", an is clearly not in very good condition. Quite dirty, battered, with the band 2 BNC connector ruined …
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ven. 22 septembre 2017
HP ZR24W PSU Repair
A friend of mine had a problem with his (a bit old) 24" HP monitor: the device was working properly, but only for a while (few minutes at most).
Looked like a good candidate for a quick repair, problem being most probably bad caps are so.
The first step was …
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mar. 03 janvier 2017
HP3562A Dynamic Signal Analyzer
One of my old test gears waiting for my attention in the cellar was a HP 3562A Dynamic Signal Analyzer. Back then I bought this device mainly for doing audio analysis (I was building my HiFi system, mostly based on Nelson Pass' schematics), mainly to display spectrum responses and compute …
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mar. 03 janvier 2017
HP3562A Dynamic Signal Analyzer - Part 2
This is the part 2 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the Digital Section of the instrument.
Digital Section
The unit is quite capable, since the main CPU is a 68000 (not exactly of small CPU for the time).
The 8 boards are:
- A1 …
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mar. 03 janvier 2017
HP3562A Dynamic Signal Analyzer - Part 3
This is the part 3 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the Analog Section of the instrument.
Analog Section
The analog section consist in 6 boards:
- A30: Analog Source
- A31: Trigger
- A32, A34: Input ADCs
- A33, A35: Input
Analog Source
This board is mainly …
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mar. 03 janvier 2017
HP3562A Dynamic Signal Analyzer - Part 4
This is the part 4 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the HP 1345A Digital Display unit as well as the repair I had to do on it.
Display
The display unit is a HP1345A Digital Display without the option 714 (wich adds a …
Recent articles
- EIP 545B RF Frequency Counter - Part 5
- EIP 545B RF Frequency Counter - Part 4
- EIP 545B RF Frequency Counter - Part 3
- EIP 545B RF Frequency Counter - Part 2
- EIP 545B RF Frequency Counter
- HP ZR24W PSU Repair
- HP3562A Dynamic Signal Analyzer
- HP3562A Dynamic Signal Analyzer - Part 2
- HP3562A Dynamic Signal Analyzer - Part 3
- HP3562A Dynamic Signal Analyzer - Part 4