dimensions all dimensions in mm (inches) required f.s.r. ra rb 2v note 910k 100k 20v note 1m 10k 200v note 1m 1k 2kv note 1m 100r 200 a link 1k 2ma link 100r 20ma link 10r 200ma link 1r m 15mm (0.6?) digit height programmable decimal points auto-zero auto-polarity 200mv d.c. full scale reading (f.s.r.) single rail version dpm 2000 3 ? digit lcd module the dpm 2000 uses advanced components and construction techniques to provide an unrivalled combination of high performance, elegant appearance and low cost. the module uses a bandgap reference for extra temperature stability. for single rail operation, the dpm 2000s features a built-in negative rail generator, enabling the meter to measure a signal referenced to its own power supply 0v. specification min. typ. max. unit accuracy (overall error) * 0.05 0.1 % (1 count) linearity 1 count sample rate 3 samples/sec operating temperature range 0 50 c temperature s 30 ppm/c supply dpm 2000 7.5 9 14 (v+ to v-) dpm 2000s 3.5 5 6.5 v supply current dpm 2000 150 dpm 2000s 500 a input leakage current (vin = 0v) 1 10 pa * to ensure maximum accuracy, re-calibrate periodically. tability voltage m stock number standard meter dpm 2000 single rail version dpm 2000s on board solder links scaling resistors scaling note 67.5 (2.66) 32.5 (1.28) 27.5 (1.08) 19.0 (0.75) 29.5 (1.16) 29.5 (1.16) 60.0 (2.36) 53.0 (2.09) 62.5 (2.46) ?2.50 (0.10) cd e fg test xb3 xdp -5v clk xg3 v+ rbg ref- ref+ e3 bp ab pol ref hi ref lo com l h v- i i + - ph % v g f c a m m k dp1 dp2 dp3 ~ : - m w display in test mode a. 1.00 (0.04) b. 9.00 (0.35) c. 1.25 (0.05) d. 5.50 (0.22) e. 4.00 (0.16) f. 0.50 (0.02) g. 2.54 (0.10) lmp 8 13 12 h5 9 6 14 11 4 2 7 5 1 3 10 rb ra two resistors ra and rb may be fitted in order to alter the full scale reading (f.s.r) of the meter - see table. the meter will need re-calibration. ensure that link 10 is open if fitting ra. safety to comply with the low voltage directive (lvd 93/68/eec), input voltages to the module?s pins must not exceed 60vdc. if voltages to the measuring inputs do exceed 60vdc, then fit scaling resistors externally to the module. the user must ensure that the incorporation of the dpm into the user?s equipment conforms to the relevant sections of bs en 61010 (safety requirements for electrical equipment for measuring, control and laboratory use) . 72.0 (2.83) 36.0 (1.42) ab
pin functions special note - annunciators. 1. v- negative power supply connection. 2. ih positive measuring input. analogue inputs must b e n o closer than 1v to either the positive or negative supply. the negative 3. il negative measuring input. supply of an s-type meter i s g enerated internally and mirrors the positive supply voltage. 4. com the ground for the analogue section of the a/d converter, held actively at 2.8v (nom.) below v+. com must not be allowed to sink excessive current (>100 a) by connecting it directly to a higher voltage. 5. ref l o n egative input for reference voltage. 6. ref hi positive input for reference voltage (connected via link 1 t o ref+). 7. pol drive for negative (-) annunciator. internally connected via link 11 to the annunciator. 8, 10, 15, 19 outputs for autoranging applications. 9. bp lcd back plane drive waveform. 11. ref+ positive output from internal reference (connected via link 1 t o ref hi). 12. ref- negative output from internal reference. must be tied t o a suitable ground return t o bias bandgap (normally com). 13. r bg ouput of bandgap reference (1.22v nom). 14. v+ positive power supply connection. 16. clock clock output. may be used for systems timing or as an input to override the internal oscillator and control the sample rate. 17. -5v output from negative rail generator circuit (dpm 2000s only). this is an inversion of v+. 18. xdp connect to required annunciators/dps (see special note - annunciators). 20. test connect to v+ to momentarily turn o n segments as illustrated. it should not be operated for more than a f ew seconds as the d.c. voltage applied t o the lcd may 'burn' the display. this pin is 5v (nom) below v+ and is the ground for the digital section of the meter. it can be used to power external logic up to a maximum of 1ma. m the dpm annunciators (dps, c, etc.) can be displayed either b y connecting to xdp or by applying a solder blob link to the xdp pads located under the annunciator input pads. however, a s these annunciators are normally 'floating', under c ertain conditions they may appear when not wanted. to suppress unwanted annunciators, apply a solder blob to the backplane pads located in-between the annunciator input pads. if the annunciators are being switched, connect them via m r esistor to the bp (pin 9), the annunciators will then operate normally when connected t o xdp. ensure that an annunciator is not connected directly to the xdp and bp at the same time. note - i f suppressing pol (-) annunciator by direct connection to bp then link 11 must be cut first. w various operating modes on-board links: in order to quickly and easily change operating modes for different applications, the meter has several on-board links. they are designed to be easily opened (cut) or shorted (soldered). do not connect more than one meter to the same power supply if the meters cannot use the same signal ground. taking any input beyond the power supply rails will damage the meter. measuring current (supply must be isolated). measuring 4-20ma to read 0-999 (supply must be isolated). split supply operation (dpm 2000). measuring a floating voltage source of 200mv full scale. measuring a single ended input referenced to supply (dpm 2000s). measuring the ratio of two voltages. reading = 1000 v / v 50mv < <200mv 12 v v<2v 2 12. check links 3 & 4 are shorted. check links 3 & 4 are shorted. check links 3 & 4 are shorted. check links 2, 3 & 4 are shorted. check links 2, 3 & 4 are shorted. check link 1 is open. annunciator annunciator bp xdp xdp link either bp or xdp to annunciator. right normally shorted cut to open normally open solder to short 5 + + - - v 2 v 1 6 ref hi in hi ref lo in lo 14 3 1 v- v- 2 v+ v+ v- v+ 3 2 1 14 i in 6r2 set zero 100k 5k 4 13 in hi in lo com ref bg i out v- v+ 2 v- v- v+ v+ 14 1 3 r r= 0.2 i fsr in hi in lo 3 + - 200mv 2 in hi in lo 14 1 v- v- v+ v+ 3 2 v- v- v+ v+ 200mv 14 1 + - in hi in lo v+ v+ 14 3 2 in hi in lo 1 0v 1vmin. 14v max. 7v min. v- v- + - 200mv specifications liable to change without prior warning dpm 2000 issue 3 august/1997 m.c. applies to dpm 2000/5 annunciator annunciator bp xdp xdp do not link bp & xdp to the annunciator at the same time wrong m a r t e l e l e c t r o n i c s , c o r p . p . o . b o x 7 7 0 l o n d o n d e r r y , n h 0 3053 t o l l f r e e : ( 8 0 0 ) 8 2 1 - 0 0 2 3 p h o n e : ( 6 0 3 ) 4 3 4 - 1 4 3 3 f a x : ( 6 0 3) 434-1653
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