Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
<<   <   Page 11 / 11
mhrackin
User Rank
CEO
Meter Guts
mhrackin   8/22/2014 2:31:08 PM
NO RATINGS
ALL D'Arsonval (moving coil) meters are the best type, and the basic design is ALWAYS a DC current meter.  Many of these have a movement wiith a full-scale range of either 50uaDC (the expensive ones) or 1maDC.  These can be made to display other functions or ranges by connecting either a shunt resistor (for higher FS current) or series resistor (multiplier) to change to a DC voltmater.  For AC, the meter may be a moving-vane (e.g. Shurite type, usually relatively cheap) design which will work for AC or DC (although scale factor may be off), or uses a rectifier (typically bridge) along with a multipler or shunt.  VERY often, the shunt, multipler, and/or rectifier is EXTERNAL, so you CAN'T go by the faceplate in determining the meter configuration!  It's pretty easy to tell, thpough, with  a DC power supply, some resistors, and a multimeter.  Assume it's a "naked" DC milli/micro-ammeter, connect the PSU, a suitable current-limiting resistor, and the multimeter (in ammeter mode) in series and see what the meter does when the PSU is turned on.  Ther rest of the process (and how to calculate appropriate shunt/multiplier values) is left as an exercise for the student!

antedeluvian
User Rank
Blogger
Realistic
antedeluvian   8/22/2014 2:16:08 PM
NO RATINGS
Max

One thing I'd vaguely considered was to sand the faceplate down (using very fine sandpaper), spray-paint it white, and then add the new annotations by hand using a very fine indelible marker. But the more I think about this, the more I think the result would look absolutely horrible

But more realistically Victorian! In my blog Touring as an Engineer, I mention the Pitt-Rivers Museum where the labels on the exhibits are either handwritten or written with a typewriter with a rather grungy ribbon.

 

DrQuine
User Rank
CEO
New faceplates for analog meters
DrQuine   8/22/2014 2:08:35 PM
NO RATINGS
I recently purchased a replacement explosive gas sensor for a storage area and realized that the meter had been very neatly relabeled with the appropriate text. They were buying 0 - 20 ma gauges and then affixing new text on the meter faces for the application at hand.

<<   <   Page 11 / 11


Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Jack Ganssle, Embedded.com

Open Office: Your Fart is My Problem
Jack Ganssle, Embedded.com
8 comments
A Washington Post article, Google got it wrong. The open-office trend is destroying the workplace, describes how the author's ad agency moved her from a private office to an open space ...

Max Maxfield

Very Tasty Solar Media Player & Power Bank
Max Maxfield
16 comments
It's a funny old world and no mistake. I was sitting in the Pleasure Dome (my office) happily beavering away when someone dropped a package on my desk. When I opened this unexpected ...

Rich Quinnell

Bloopers Book Helps Improve GUI Development
Rich Quinnell
2 comments
Courtesy of fellow editor "Max" Maxfield (aka Max the Magnificent), I recently acquired a copy of GUI Bloopers 2.0 by Jeff Johnson of UI Wizards. I found it an interesting read chock full ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...