Articles in the Electronics category

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 …

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.

EIP 545B RF Frequency Counter - Part 3

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 …

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 …

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 …

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 …

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 …

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 …

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.