Articles tagged with test equipment

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 …

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.

HP 3456A Digital Voltmeter

A very long time ago, I bought a venerable HP 3456A Digital Voltmeter. Back then, I had no clear idea what kind of device it is; but it was cheap. It worked quite fine (it is indeed not calibrated), but I noticed for a while that it was quite unstable …

HP 34970A Data Acquisition Unit - communication protocol

In order to build a replacement display for the HP34970A data acquisition unit, I needed to understand the communication protocol between the CPU board and the front panel assembly.

HP 34970A Data Acquisition Unit - part 4

After a summer pause, I'm back on my HP34970A repair project. In the previous post in this series, I've started to reverse engineer the serial protocol between the CPU board and the front panel, and implement a prototype of replacement display.

HP 34970A Data Acquisition Unit - part 3

As explained in the previous post in this series, I've started to sniff the serial protocol between the main board and the display panel so I can replace the failed VFD by an OLED or TFT display managed by an arduino or similar.