TTI 1906 DATASHEETS
THURLBY THANDAR INSTRUMENTS
1906
5½ digit high performance multimeter
Full autoranging, True RMS, RS-232 & GPIB interfaces
5½ digitperformance at a 4½ digit price
higher resolution, accuracy & functionality
Greater resolution and
accuracy
The 1906 is a true 51/2digit meter with a
scale length of
This gives it not just superior resolution
relative to 4
higher effective accuracy as well.
Thediagram showshow theeffective 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
1
/2digit meter.
4
± 210,000 counts.
1
/2digit meters, but much
Greater sensitivity and
higher input impedance
With a maximum resolution of 1µV, 1mΩ
and 1nA, the1906 is ten times more sensi
tive than a 4
This extra sensitivity enables accurate
measurements to be made in areas previ
ously impossible such as thermocouple
junctions, switch contact resistance or ca
pacitor leakages.
Industry standard 10MΩ input impedance
appliestoall dcvoltageranges, butthelow
est two can alternatively be selected at
greater than 1000MΩ impedance to elimi
nate errors when measuring high imped
ance circuitry.
1
/2digit meter.
True RMS ac functions
The 1906 provides True RMS ac response
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whichgives accurate measurementsregard
less 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 switching
waveforms.
Auto or manual ranging
The 1906 offers fully automatic ranging
on all functions including current. Alter
natively any range can be selected and
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held manually.
4 terminal Ohms for
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improved stability
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Resistance measurements can bemade
in either 2 terminal or 4 terminal mode.
High impedance sensing ensures that
the meter switches automatically be
tween modes.
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For low resistance measurements, 4 ter
-
minal modeoffers much higher accuracy
and repeatability.
Theresistance functionalso providesse
lectable audible continuity as well as di
ode test capabilities.
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Closed case calibration
The 1906 stores its calibration constants
in permanentmemory (EEPROM). Consequently it can be recalibrated without
ever opening the case.
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5½digit scale length ( 210,000 counts)
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0.012% basic one year accuracy
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1uV, 1m and 1nA resolution, 4 terminal Ohms
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Full automatic or manual ranging
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True RMS ac functions, wide ac bandwidth
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Full set of current ranges from 200µA to 10A
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Wide range of computing and data logger functions
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Fully programmable by RS-232 or GPIB interfaces
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
similartests needto berepeated atinter
vals.
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