,. analog w devices 3y2 digit panel meter f or oem applications 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 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 3y2 digit 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 key to the ad2001's small size and low cost. display features the ad2001 display uses incandescent rca numitron dis- play tubes which provide a bright, sharp, easily readable dis- play over a wide range of ambient light. these tubes are rated at 100,000 hours. to assure reliability, every ad2001 is 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 ad2001 is not only a nearly direct replacement for the most common size of panel meters (whose errors specifications are usually of the 1-2% class), but it is considerably smaller than the 5vz" to 7y2" width typical of the most accurate and expensive analog meters. the front bezel design of the ad2001 allows easy installation and removal, and its light weight allows the unit to be used in hinged panel equipment. the complete unit is housed in an aluminum case which provides structural strength, optimum 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. 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. data processing equipment interfacing the ad2001 provides an excellent economy digital panel meter for display purposes. the analoktm circuit also provides bcd outputs, polarity sign, overrange, and overload signals which can be used under restricted conditions for data processing equipment interfacing. 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- tions where the use of the above procedure is not desired, the circuit shown in figure 1 may be used to generate a "polarity error" flag. multiplexing systems the analoktm circuit permits the ad2001 to read or hold a measurement under external command. this feature permits the meter to be used in multiplexing applications where a measurement time of 250ms between input changes can be accepted. up to 4 such signals can be multiplexed per second. route 1 industrial park; p.o. box 280; norwood, mass. 02062 tel: 617/329-4700 twx: 710/394-6577 west coast tel: 213/595-1783 mid-west tel: 312/297-8710 - - - --- obsolete
specifica jions (typical @ +25c and +5v unless otherwise noted) model ad2001 display output . display consists of four rca numitrons (7 segment incandescent readout tubes) for data digits plus 100% overrange and :i: polarity indication. . overload - 3 data digits read "o's" and the overrange "1" continuously flashes when reading exceeds full scale. . decimal points - selectable at input connector. accuracy . maximum error - 0.05% of reading :1:1 digit . resolution - o.lmv 6 . . temperature range - 0 c to + 0 c operating . temperature coefficient - :l:50ppm/c speed . external trigger - up to 20 conversions per second . internal conversion - 5 conversions per second (factory adjustable) . hold and read on command . measurement time (including settli~ time to 0.05%) - 250ms computer signals in out . dtlfftl compatible logic "0" <0.8v 2.0v >2.4v . inputs external tri~er - operation in the "external trigger" mode requires that the "external hold" input (pin d) be grounded. an ext~rnal trigger pulse (logic "1" to logic "0") is required. maximum pulse width is 10ms. minimum pulse width is ims. external hold - when this input is grounded or held at 0.8v max, the last conversion is held and displayed. for a new con- version under internal control this input must be open or at 5v. . outputs 3 bcd digits (8421), positive logic overrange - logic "1" indicates an overrange overload - logic "1" indicates an overload condition polarity - logic "0" with positive polarity input conversion gate - logic "1" when conversion is complete, logic "0" during. conversion. if unit is overloaded the output will remain a logic "0" during alternate conversions. input . full scale range - 0 to :1:199.9 millivolts, automatic zero, polarity. . bias current - 1.5na . impedance - 100mu . over voltage protection - 100 times full scale sustained without damage . decimal points (3) - selectable by grounding or logic "0" power . +5vdc :1:5% - 1000ma, 5 watts max . separate dc inputs - regulated :1:5% - 200ma (converter) unr~ulated - 800ma (display) warm up . essentially none to specified accuracy adjustments . range potentiometer for reference recommended after six months. weight - 5 oz. (140gm) connector recommendation . 30 pin 0.156 spacing viking no.2 vk 15d/1-2 . optional - specify ac 1501 $3.50 each price - 1-9 - $135 100+ - $89 adjustment. recalibration specifications subject to change without notice. -- digital panel meter pin connections pin function pin ref pin function - ext. trigger 1 a overrange (800) 2 b (100) key (200 ) external hold polarity (80) (10) grd conv. gate (8) (1) +5v conv. (2) +5v disp. d.p. lxx.x (400) d.p.i.xxx tl overload (40) (20) (spare) 3 c 4 d 5 e 6 f 7 h 8 j 9 k 10 l 11 m 12 n 13 p 14 r 15 s (4) ein ein common dp lx.xx 39kn conve~n gate 0.1~f 10 11 16 3 0 4 5 ,vat, , ci 17 14 74121 t"2m, "'" ..... -. - i lo i ..a ..... 0 - u +5vdc ~5 error 31c i ]i, 7474 i 6 error 4 ci figure 1. "polarity error" flag circuit +5vdc overall dimensions dimensions shown in inches and (em). 3.09 ~max (7.85)::;==r- 'i i 1.85 ibd 1.84 mm mm ~i ;4" l ---=3.13 ~ i 0.30 r- max 1.53 i- (0.76) (7.95) max (3.89) t ~ z c w i- z a: 0.. recommended panel cutout 1.60.01 0 (4.06 fo.o4) 1 i . 3.00 '0.015 -i (7.62 '0.04) obsolete
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