AD2001_15 Datasheet, PDF (1/2 Pages) Analog Devices – DIGIT PANEL METER FOR OEM APPLICATIONS

,. ANALOG
W DEVICES
3Y2 DigitPanelMeter
For OEMApplications
AD2001
PRELIMINARY TECHNICAL DATA
FEATURES
Low Cost: $89 in 100's
Small Size: 1.8" H x 3.1" W x 1.5" D
Maximum Error: 0.05%:t1 Digit
Bright Sharp Display
High Reliability
OBSOLETE APPLICATIONS
Instrumentation with Numerical
Readout in Engineering Units
General-Purpose Instrumentation with
Auto Ranged Gain & Decimal
Point Settling
Voltage & Current Measurement
GENERAL DESCRIPTION
The AD2001 is a 3Y2digit panel meter designed for original
equipment requiring high performance at a low price. The
maximum' error of the AD2001 is 0.05% of reading :tl digit
with a temperature coefficient of :t50ppm/ C. An unusual
AID converter approach-ANALOKTM_yields a minimum
component and high accuracy design. ANALOKTM allows
the unit to operate from a single 5VDC power source and is
The AD2001 logic levels are compatible with DTL & TTL inte-
grated circuits. The AD2001 can operate from the user's.5VDC
system supply-eliminating the shielding, decoupling, etc. nor-
mally needed when the AC line m!lst be routed near signal
leads. Separate DC inputs to the converter and display, allow
the OEM designer to minimize effects of display transients on
conversion accuracy, economize regulated power and, by use
of an external circuit, to blank the display.
the key to the AD2001's small size and low cost.
DATA PROCESSING EQUIPMENT INTERFACING
DISPLAY FEATURES
The AD2001 provides an excellent economy digital panel
The AD2001 display uses incandescent RCA Numitron dis-
meter for display purposes. The ANALOKTM circuit also
play tubes which provide a bright, sharp, easily readable dis-
play over a wide range of ambient light. These tubes are rated
provides BCD outputs, polarity sign, overrange, and overload
signals which can be used under restricted conditions for
at 100,000 hours. To assure reliability, every AD2001 is
data processing equipment interfacing.
burned in for 7 days prior to shipment. Other standard features
of the display are: automatic polarity, programmable decimal
points, automatic zero, full scale :t199.9mV and automatic
overload indication. The display rate is5 readings per second,
with rates of 1 reading per second or lower available.
DESIGN EFFICIENCY FOR THE OEM
The logic "one" on the overload output line can be generated
by either an actual "overload" (>199.9mV) at the input or an
input polarity change. It is recommended that in data proces-
sing interface applications the data logger or computer equip-
ment be programmed to ignore the BCD output data whenever
the logic "1" appears on the overload line. In specific applica-
The AD2001 is not only a nearly direct replacement for the
tions where the use of the above procedure is not desired, the
most common size of panel meters (whose errors specifications
circuit shown in Figure 1 may be used to generate a "Polarity
are usually of the 1-2% class), but it is considerably smaller
Error" flag.
than the 5Vz" to 7Y2" width typical of the most accurate and
expensive analog meters.
MULTIPLEXING SYSTEMS
The ANALOKTM circuit permits the AD2001 to read or hold
The front bezel design of the AD2001 allows easy installation
a measurement under external command. This feature permits
and removal, and its light weight allows the unit to be used in
the meter to be used in multiplexing applications where a
hinged panel equipment. The complete unit is housed in an
measurement time of 250ms between input changes can be
aluminum case which provides structural strength, optimum
accepted. Up to 4 such signals can be multiplexed per second.
heat dissipation, and shielding from external noise. Overvoltage
protection is also provided.
Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
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