Custom Built Test Instruments
I designed and built 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
This was a Student Project of mine, 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.