This is just a schematic view of a digital
voltmeter all components and values are listed.
Expanded scale indicator
08/08/2002 EDN - Design Ideas / The
visualization aid that a previous Design Idea
describes allows only the expansion of the upper
end of the scale (Reference 1). But what can you
do if, according to your project requirements,
you need to expand the middle region of the
scale? Figure 1a illustrates the challenge. A
voltmeter comprises a 100-µA dc meter and a
Expanded Scale Voltmeter uses
Just Two Parts:
01/20/1994 EDN Design Ideas / The expanded
voltmeter doesnt require trimpots to obtain
usable accuracy or require the tedious selection
of Zener diodes. This circuit consists of only
two parts and a5V meter. The circuit is
completely linear and requires no calibration
except the rare mechanical zeroing of the meter.
By using a split voltage reference system with
floating output, the zero point of the voltage
supplied to the meter equals the absolute sum of
the two references.
Improve Voltage Readings By
Doubling A DVM's Scale:
04/29/02 Electronic Design - Ideas for Design /
The ubiquitous, and now inexpensive, 1999-digit
digital panel meter or digital voltage meter (DVM)
module is a very useful addition to the range of
test and display gear currently available. It's
accurate, robust, and easily scaled for ranges
from. . .
Indicator features expanded scale:
02/21/2002 EDN - Design Ideas / Test equipment
for a production line should be user-friendly
(read "idiot-proof") and should offer minimal
test time. In many cases, the test fixture must
give an operator only one answer: pass or fail.
Usually, two indicators assume this role: green
for pass and red for fail. In most applications,
a sensor transforms the tested parameter to a
voltage; the test fixture must measure this v...