Custom Built Test Instruments
Designed and built by delabs, many custom
"engineered" Test Instruments. They were not
prefect, as only one or two were fabricated. That
means it will be costly to produce such instruments.
It is just like tooling, you have to make some
numbers to recover costs, or price it very high to
compensate for the wastages and iterations. But
things are better off now for building custom
instruments. Yet a design firm has to make modules
and keep ready, then put together a solution/system,
program and ship.
Reverse Bias Leakage Tester
When making custom equipment, you have to have an
extended service agreement like 5 years. Also
request a minimum order of at least 5. Make your
R&D and Inventory Modular. That way it is
profitable and some money available for reinvestment
on instruments and Equipment for calibration and
Resistance LED Meter
Transistor Beta and Vce Tester
This was a Beta Hfe and Vce Measuring Instrument
used in Incoming Inspection of Power Transistors
made by me 20 years back.
Measureall Workbench Test Instrument
A Student Project, it is a very basic instruments
that could do most of the tasks on a test bench.
and Automation - 01
The cabinet used, was available as a part of a
Hi-Fi DIY System, The Range and Mode switches were
Modular Stackable Interlocked MultiPole Switches.
The rest of the Interface were wirewound pots,
jacks, sockets and plugs. The front panel was
Engraved Acrylic, the panel was the toughest issue
The above circuits belong to an instrument
Measureall shown below.
I wanted it to look well engineered, at least on
the outside. It was a total analog instrument
except for the digital indication of ICL7107.
Thanks to ‘Intersil Hot Ideas’ Applications Book.