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Weightec 348 Manual

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2.1 METROLOGY CERTIFICATES
Test Certificate nr. TC 5164 : EC Metrology Legislation: n < 10,000, e > 0.3 µV, impedance > 58 Ω,
and Approval nr. T 5170 loadcell cable length is not limited, no EMC precautions are required
CE marking : Based on 50081-1, EN 50082-1, EN 61000-3-2 and EN 45501.
2.2 LOADCELL EXCITATION
Voltage : 4.5 - 6.5 VAC, sine wave 218 Hz, short circuit protected
Current : 150 mA, max 8 loadcells of 350 Ω each
Sense return : 6 wire connection, the sense signal is implemented in the A/D conversion,
so no special stabilization of the excitation voltage is provided
Loadcell cable : 6 wires, twisted pairs, low capacity, metal foil screened,
article nr. 32 TPST. No cable length limitation.
2.3 LOADCELL INPUT SEE FOR CONNECTIONS PAGE 24
Impedance (dynamic) : 20 MΩ, 10 nF parallel, short circuit protected and excitation voltage proof
Sensitivity : 0.9 nV per division
Noise (A/D converter incl.) : 2.7 nV pp
Sensitivity settings : 0 . . . 0.25 mV/V up to 2 mV/V, in 8 steps of 0.25 mV/V, see table 1
Measuring range : 0 . . . 1.25 mV up to 0 . . . 13 mV, dependent of the sensitivity setting
Dead load compensation : Max 1 mV/V, up to 0.25% accuracy settable by switches,
moreover up to 0.0007% digital with the (auto-)zero function
Linearity adjustment : Contra parabola, effective over the net measuring range (overload setting),
range 0.09% in + and -, settable per 0.006%
2.4 A/D CONVERTER, DIGITAL SYSTEM
Principle : 21 bit continuous integrating ratio measurement
Integration time : 2,3 msec. per complete conversion, 436 Hz
Resolution internal : 1,501,500 counts, used at adjustment, zero setting, no motion detector,
taring, internal display reading en setpoint comparators
Resolution external Data output 15,015 divisions, setpoint data input 150,000 divisions,
output A/D converter max 2,000,000 counts
Stability noise : 3 counts pp at 150,000 counts, amplifiers and A/D converter included
2.5 DEFAULT DAMPING, FILTERS
Internal : 4.7 Hz one pole filter in the A/D converter
Settable : Digital two pole filter, settable from 0.13 Hz up to 4.02 Hz in 8 steps,
see table 2
Auto adaptive : Progressive increasing damping at approach of standstill,
increasing up to tot 0.07 Hz
Manual 348-2 V 3.1 Page 7 01-06-2007
… 7 …


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