technical specifications input characteristics input current: < 100 pa. dc nmr: > 60db at 50/60hz. 1k unbalanced cmr: > 120db at dc/50hz/60hz, dc ranges; > 60db at dc/50hz/60hz, ac ranges. accuracy accuracies apply for 1 year 18 o c to 26 o c. temperature coefficient outside these limits is <0 1 x quoted range accuracy per o c. warm-up time to rated accuracy is 1 hour. dc volts range accuracy( ) input imped- ance max input 200mv 0 017% + 3d 10m w or >1g w (hi z mode) 1kv dc or ac peak any range 2v 0 012% + 3d 20v 0 019% + 3d 10m w 200v 0 019% + 3d 1000v 0 019% + 3d resistance (ohms) range accuracy( ) max. measuring current max. input 200 0 025% + 4d 1 5ma 300v dc or rms continu- ous any ohms input any range 2k 0 019% + 3d 1 5ma 20k 0 019% + 3d 0 4ma 200k 0 019% + 3d 40 m a 2m 0 022% + 3d 4 m a 20m 0 07% + 3d 400na max open circuit voltage 3 5v. diode test on 2k range. audible continuity check available on all ranges. ac volts (true rms) range accuracy( ) 45hz - 5khz 5khz - 10khz 10khz-20khz 20khz-50khz 200mv 0 2% + 150d 0 2% + 250d 3% + 500d - 2v 0 2% + 150d 0 2% + 250d 0 5% + 300d 3% + 1500d 20v 0 2% + 150d 0 2% + 250d 0 5% + 300d 2% + 1000d 200v 0 2% + 150d 0 2% + 250d 0 5% + 500d - 750v 0 2% + 150d --- additional error at crest factor=3 typically 0 7% input impedance 1m w / <100 pf any range. max input 750v rms, 1kv peak, any range. dc amps range accuracy( ) voltage bur- den max. input 200 m a0 08% + 12d 300 mv max 1a, 300v fuse pro- tected 2ma 0 08% + 12d 20ma 0 08% + 12d 200ma 0 08% + 12d 10a <2000ma 0 08% + 12d 650mv max 10a, 300v fuse pro- tected >2000ma 0 12% + 12d ac amps (true rms) range accuracy( ) 45 hz - 1 khz voltage burden max input 200 m a0 37% + 100d 300mv max 1a, 300v fuse pro- tected 2ma 0 37% + 100d 20ma 0 37% + 100d 200ma 0 37% + 100d 10a <2000ma 0 37% + 100d 650mv max 10a, 300v fuse pro- tected >2000ma 0 4% + 100d additional error at crest factor=3 typically 0 7%. display display type: 13mm led, 8 digit. scale length: selectable 5? digit or 4? digit. reading rate: 3 readings/sec (5? digit). 10 readings/sec (4? digit). overrange: displays ol if input too great for range. overflow: displays oflo if calculated result overflows display. annunciators: leds for range, function and program modes. computing functions null: operates over full range; values can be stored for every function. digital filter: 10 options, including optimised default values for each range and function. touch & hold: reading is held when stable. % dev: displays % deviation from entered reference value. db: displays measurement in db relative to 1v, 1ma, 1k w or user entered value, or in dbm. ax+b: linear scaling of results, with offset. limits: reading displayed with h , l , or p (pass) with respect to user-defined high and low limits. min/max: minimum and maximum reading stored. data logger: manual or automatic storage of 100 measurements, storage interval 1s to 9999s. interfaces rs232: baud rates 300, 1200 or 9600. complies fully with the arc (addressable rs232 chain) interface stan- dard. address selectable from the front panel. gpib (optional): fully complies with ieee-488.1 and ieee-488.2 power requirements ac input: 110/120 volts ac nominal 50/60hz or 220/240 volts ac nominal 50/60hz by rear panel adjustment. the instrument will operate safely and meet specification within normal ac supply variations, viz. 99-132 volts ac and 198-264 volts ac respectively. consumption: 25va max. general operating range: +5 o c to +40 o c, 20% to 80% rh storage range: -40 o c to +60 o c size: 260(w) x 88(h) x 235(d)mm, excl. handle and feet weight: 2 2kg. designed and built in the u.k. by: thurlby thandar instruments ltd. operates a policy of continuous devel- opment and reserves the right to alter specifications without prior notice. 82100-0047 thurlby thandar instruments limited glebe road, huntingdon. cambs. pe18 7dx england tel: (0)1480 412451, fax: (0)1480 450409 thurlby thandar instruments 1906 5 1 / 2 digit computing multimeter full autoranging, true rms, rs-232 & gpib interfaces
5? digit performance at a 4? digit price higher resolution, accuracy & functionality greater resolution and accuracy the 1906 is a true 5 1 / 2 digit meter with a scale length of 210,000 counts. this gives it not just superior resolution relative to 4 1 / 2 digit meters, but much higher effective accuracy as well. l 5 1 / 2 digit scale length ( 210,000 counts) l 0.012% basic one year accuracy l 1uv, 1m w and 1na resolution, 4 terminal ohms l full automatic or manual ranging l true rms ac functions, wide ac bandwidth l full set of current ranges from 200ua to 10a l wide range of computing and data logger functions l fully programmable by rs-232 or gpib interfaces the diagram shows how the effective ac- curacy varies with reading after taking into account the fixed errors. over a range of voltages, the 1906 is around four times more accurate than a typical 4 1 / 2 digit meter. greater sensitivity and higher input impedance with a maximum resolution of 1 m v, 1m w and 1na, the 1906 is ten times more sen- sitive than a 4 1 / 2 digit meter. this extra senstivity enables accurate measurements to be made in areas pre- viously impossible such as thermocouple junctions, switch contact resistance or capacitor leakages. industry standard 10m w input imped- ance applies to all dc voltage ranges, but the lowest two can alternatively be se- lected at greater than 1000m w imped- ance to eliminate errors when measuring high impedance circuitry. 4 terminal ohms for improved stability resistance measurements can be made in either 2 terminal or 4 terminal mode. high impedance sensing ensures that the meter switches automatically be- tween modes. for low resistance measurements, 4 ter- minal mode offers much higher accuracy and repeatability. the resistance function also provides se- lectable audible continuity as well as di- ode test capabilities. true rms ac functions the 1906 provides true rms ac response which gives accurate measurements re- gardless of the waveform shape. the wide bandwidth voltage attenuator provides high accuracy within the audio band and gives extended response to avoid distortion when measuring switch- ing waveforms. auto or manual ranging the 1906 offers fully automatic ranging on all functions including current. alter- natively any range can be selected and held manually. closed case calibration the 1906 stores its calibration constants in permanent memory (eeprom). con- sequently it can be recalibrated without ever opening the case. storage of front-panel set-ups the 1906 can store up to six front panel set-ups in non-volatile memory. in addition to the range and function each set-up defines the active comput- ing or logging functions along with their parameters. this facility is particularly valuable when similar tests need to be repeated at inter- vals. full protection for the instrument and the user the 1906 incorporates extensive protec- tion against damage from accidental over- loads on all ranges including 10 amps. in addition the 1906 meets the stringent safety requirements of iec348 and iec1010-1 for measurements up to 1kv. built-in computing & data logging full bus programmability automatic data logging the 1906 can store up to 100 readings at any required time interval from 1 reading per second up to 1 reading every 3 hours. a simple recall sequence allows the readings to be scrolled onto the display whenever required. alternatively results can be downloaded using the rs232 or gpib interfaces. as a result, tedious time related meas- urement sequences can be handled automatically without disrupting your work. manual storage of readings is also avail- able eliminating the need for paper and pencil when making a series of measure- ments. storage can also be triggered from the rs-232 or gpib interfaces. single key convenience functions for ease of use press the null key and the present dis- played reading is stored and subtracted from all future readings. this powerful feature has a host of uses such as removing test lead resistance, observing deviation levels, or measuring relative to alternative voltage points us- ing a fixed ground lead connection. touch and hold the touch and hold function is invaluable when taking measurements in awkward situations where it may be difficult to see the multimeter display. with touch and hold selected, the display is automatically frozen every time a sta- ble reading is achieved. a further press of the t/hold key un-freezes the dis- play. digital filtering for better noise performance the 1906 uses non-linear digital filtering which is highly effective in eliminating unwanted noise, but responds rapidly to a change in the reading. when working with very noisy or unsta- ble measurements, the characteristics of the digital filter can be adjusted to suit the application. linear scaling with offset (ax+b) this function enables a reading to be multiplied by a scale factor (a) and for an offset (b) to be added or subtracted. this means, for example, that the electri- cal output of a transducer can be scaled to give a direct readout of the physical parameter e.g. temperature or weight. it is particularly useful with 4-20ma cur- rent loops. limits comparison this function enables the reading to be tested against high and low limits set by the user. the display then shows a code of h (high), l (low) or p (pass) at the end of the display. percentage deviation ( d %) this function enables the meter to dis- play the percentage amount by which the reading differs from a nominal value cho- sen by the user. it is invaluable for measuring tolerance or stability. min-max storage the min-max function stores the highest and lowest values of a set of readings. this facility has many uses such as checking for power supply glitches, re- cording peak temperature excursions and avoiding missed readings when using the logger function. logarithmic measurements (db) this function allows measurements to be displayed in the form 20log 10 x. built-in zero reference scaling enables voltages to be displayed in dbv or dbm relative to any required impedance. using the null key allows gains and losses to be measured directly. full bus control via rs-232 or gpib the 1906 is designed for complete bus control. every function of the instrument can be controlled using either the rs-232 interface or the gpib interface (optional). the rs-232 interface, which is fitted as standard, is compatible with the tti arc system. the arc system (addressable rs232 chain) enables up to 32 instruments to be daisy-chained together and to be in- dividually addressed and controlled us- ing a single rs232 port of a pc. compatible with ieee-488.2 the gpib interface is an option. when installed, a rear panel switch allows the user to choose between rs232 or gpib control. the gpib interface conforms fully with both ieee-488.1 and ieee-488.2. the .2 standard contains many enhancements which are particularly important when programming systems incorporating a number of instruments.
5? digit performance at a 4? digit price higher resolution, accuracy & functionality greater resolution and accuracy the 1906 is a true 5 1 / 2 digit meter with a scale length of 210,000 counts. this gives it not just superior resolution relative to 4 1 / 2 digit meters, but much higher effective accuracy as well. l 5 1 / 2 digit scale length ( 210,000 counts) l 0.012% basic one year accuracy l 1uv, 1m w and 1na resolution, 4 terminal ohms l full automatic or manual ranging l true rms ac functions, wide ac bandwidth l full set of current ranges from 200ua to 10a l wide range of computing and data logger functions l fully programmable by rs-232 or gpib interfaces the diagram shows how the effective ac- curacy varies with reading after taking into account the fixed errors. over a range of voltages, the 1906 is around four times more accurate than a typical 4 1 / 2 digit meter. greater sensitivity and higher input impedance with a maximum resolution of 1 m v, 1m w and 1na, the 1906 is ten times more sen- sitive than a 4 1 / 2 digit meter. this extra senstivity enables accurate measurements to be made in areas pre- viously impossible such as thermocouple junctions, switch contact resistance or capacitor leakages. industry standard 10m w input imped- ance applies to all dc voltage ranges, but the lowest two can alternatively be se- lected at greater than 1000m w imped- ance to eliminate errors when measuring high impedance circuitry. 4 terminal ohms for improved stability resistance measurements can be made in either 2 terminal or 4 terminal mode. high impedance sensing ensures that the meter switches automatically be- tween modes. for low resistance measurements, 4 ter- minal mode offers much higher accuracy and repeatability. the resistance function also provides se- lectable audible continuity as well as di- ode test capabilities. true rms ac functions the 1906 provides true rms ac response which gives accurate measurements re- gardless of the waveform shape. the wide bandwidth voltage attenuator provides high accuracy within the audio band and gives extended response to avoid distortion when measuring switch- ing waveforms. auto or manual ranging the 1906 offers fully automatic ranging on all functions including current. alter- natively any range can be selected and held manually. closed case calibration the 1906 stores its calibration constants in permanent memory (eeprom). con- sequently it can be recalibrated without ever opening the case. storage of front-panel set-ups the 1906 can store up to six front panel set-ups in non-volatile memory. in addition to the range and function each set-up defines the active comput- ing or logging functions along with their parameters. this facility is particularly valuable when similar tests need to be repeated at inter- vals. full protection for the instrument and the user the 1906 incorporates extensive protec- tion against damage from accidental over- loads on all ranges including 10 amps. in addition the 1906 meets the stringent safety requirements of iec348 and iec1010-1 for measurements up to 1kv. built-in computing & data logging full bus programmability automatic data logging the 1906 can store up to 100 readings at any required time interval from 1 reading per second up to 1 reading every 3 hours. a simple recall sequence allows the readings to be scrolled onto the display whenever required. alternatively results can be downloaded using the rs232 or gpib interfaces. as a result, tedious time related meas- urement sequences can be handled automatically without disrupting your work. manual storage of readings is also avail- able eliminating the need for paper and pencil when making a series of measure- ments. storage can also be triggered from the rs-232 or gpib interfaces. single key convenience functions for ease of use press the null key and the present dis- played reading is stored and subtracted from all future readings. this powerful feature has a host of uses such as removing test lead resistance, observing deviation levels, or measuring relative to alternative voltage points us- ing a fixed ground lead connection. touch and hold the touch and hold function is invaluable when taking measurements in awkward situations where it may be difficult to see the multimeter display. with touch and hold selected, the display is automatically frozen every time a sta- ble reading is achieved. a further press of the t/hold key un-freezes the dis- play. digital filtering for better noise performance the 1906 uses non-linear digital filtering which is highly effective in eliminating unwanted noise, but responds rapidly to a change in the reading. when working with very noisy or unsta- ble measurements, the characteristics of the digital filter can be adjusted to suit the application. linear scaling with offset (ax+b) this function enables a reading to be multiplied by a scale factor (a) and for an offset (b) to be added or subtracted. this means, for example, that the electri- cal output of a transducer can be scaled to give a direct readout of the physical parameter e.g. temperature or weight. it is particularly useful with 4-20ma cur- rent loops. limits comparison this function enables the reading to be tested against high and low limits set by the user. the display then shows a code of h (high), l (low) or p (pass) at the end of the display. percentage deviation ( d %) this function enables the meter to dis- play the percentage amount by which the reading differs from a nominal value cho- sen by the user. it is invaluable for measuring tolerance or stability. min-max storage the min-max function stores the highest and lowest values of a set of readings. this facility has many uses such as checking for power supply glitches, re- cording peak temperature excursions and avoiding missed readings when using the logger function. logarithmic measurements (db) this function allows measurements to be displayed in the form 20log 10 x. built-in zero reference scaling enables voltages to be displayed in dbv or dbm relative to any required impedance. using the null key allows gains and losses to be measured directly. full bus control via rs-232 or gpib the 1906 is designed for complete bus control. every function of the instrument can be controlled using either the rs-232 interface or the gpib interface (optional). the rs-232 interface, which is fitted as standard, is compatible with the tti arc system. the arc system (addressable rs232 chain) enables up to 32 instruments to be daisy-chained together and to be in- dividually addressed and controlled us- ing a single rs232 port of a pc. compatible with ieee-488.2 the gpib interface is an option. when installed, a rear panel switch allows the user to choose between rs232 or gpib control. the gpib interface conforms fully with both ieee-488.1 and ieee-488.2. the .2 standard contains many enhancements which are particularly important when programming systems incorporating a number of instruments.
technical specifications input characteristics input current: < 100 pa. dc nmr: > 60db at 50/60hz. 1k unbalanced cmr: > 120db at dc/50hz/60hz, dc ranges; > 60db at dc/50hz/60hz, ac ranges. accuracy accuracies apply for 1 year 18 o c to 26 o c. temperature coefficient outside these limits is <0 1 x quoted range accuracy per o c. warm-up time to rated accuracy is 1 hour. dc volts range accuracy( ) input imped- ance max input 200mv 0 017% + 3d 10m w or >1g w (hi z mode) 1kv dc or ac peak any range 2v 0 012% + 3d 20v 0 019% + 3d 10m w 200v 0 019% + 3d 1000v 0 019% + 3d resistance (ohms) range accuracy( ) max. measuring current max. input 200 0 025% + 4d 1 5ma 300v dc or rms continu- ous any ohms input any range 2k 0 019% + 3d 1 5ma 20k 0 019% + 3d 0 4ma 200k 0 019% + 3d 40 m a 2m 0 022% + 3d 4 m a 20m 0 07% + 3d 400na max open circuit voltage 3 5v. diode test on 2k range. audible continuity check available on all ranges. ac volts (true rms) range accuracy( ) 45hz - 5khz 5khz - 10khz 10khz-20khz 20khz-50khz 200mv 0 2% + 150d 0 2% + 250d 3% + 500d - 2v 0 2% + 150d 0 2% + 250d 0 5% + 300d 3% + 1500d 20v 0 2% + 150d 0 2% + 250d 0 5% + 300d 2% + 1000d 200v 0 2% + 150d 0 2% + 250d 0 5% + 500d - 750v 0 2% + 150d --- additional error at crest factor=3 typically 0 7% input impedance 1m w / <100 pf any range. max input 750v rms, 1kv peak, any range. dc amps range accuracy( ) voltage bur- den max. input 200 m a0 08% + 12d 300 mv max 1a, 300v fuse pro- tected 2ma 0 08% + 12d 20ma 0 08% + 12d 200ma 0 08% + 12d 10a <2000ma 0 08% + 12d 650mv max 10a, 300v fuse pro- tected >2000ma 0 12% + 12d ac amps (true rms) range accuracy( ) 45 hz - 1 khz voltage burden max input 200 m a0 37% + 100d 300mv max 1a, 300v fuse pro- tected 2ma 0 37% + 100d 20ma 0 37% + 100d 200ma 0 37% + 100d 10a <2000ma 0 37% + 100d 650mv max 10a, 300v fuse pro- tected >2000ma 0 4% + 100d additional error at crest factor=3 typically 0 7%. display display type: 13mm led, 8 digit. scale length: selectable 5? digit or 4? digit. reading rate: 3 readings/sec (5? digit). 10 readings/sec (4? digit). overrange: displays ol if input too great for range. overflow: displays oflo if calculated result overflows display. annunciators: leds for range, function and program modes. computing functions null: operates over full range; values can be stored for every function. digital filter: 10 options, including optimised default values for each range and function. touch & hold: reading is held when stable. % dev: displays % deviation from entered reference value. db: displays measurement in db relative to 1v, 1ma, 1k w or user entered value, or in dbm. ax+b: linear scaling of results, with offset. limits: reading displayed with h , l , or p (pass) with respect to user-defined high and low limits. min/max: minimum and maximum reading stored. data logger: manual or automatic storage of 100 measurements, storage interval 1s to 9999s. interfaces rs232: baud rates 300, 1200 or 9600. complies fully with the arc (addressable rs232 chain) interface stan- dard. address selectable from the front panel. gpib (optional): fully complies with ieee-488.1 and ieee-488.2 power requirements ac input: 110/120 volts ac nominal 50/60hz or 220/240 volts ac nominal 50/60hz by rear panel adjustment. the instrument will operate safely and meet specification within normal ac supply variations, viz. 99-132 volts ac and 198-264 volts ac respectively. consumption: 25va max. general operating range: +5 o c to +40 o c, 20% to 80% rh storage range: -40 o c to +60 o c size: 260(w) x 88(h) x 235(d)mm, excl. handle and feet weight: 2 2kg. designed and built in the u.k. by: thurlby thandar instruments ltd. operates a policy of continuous devel- opment and reserves the right to alter specifications without prior notice. 82100-0047 thurlby thandar instruments limited glebe road, huntingdon. cambs. pe18 7dx england tel: (0)1480 412451, fax: (0)1480 450409 thurlby thandar instruments 1906 5 1 / 2 digit computing multimeter full autoranging, true rms, rs-232 & gpib interfaces
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