
Technical Specifications
Analog Input
VT200/220 Technical Manual, Rev 1.00.01
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TM-VT200/220-EN
1.2 Analog
Input
A second analog input may be added as an option, if no analog output is
needed. The same specifications apply. Second analog input is not supporting
continuous weight output AND format see 6.3.2
Load cell excitation
±5V switched polarity or +5VDC with sense.
Connection
6-wire technique. Max 10 load cells 350 Ohm each.
Signal range
-0.25 to 1.75mV/V (Gain=10), -0.25 to 3.75mV/V (Gain=20).
Sensitivity
•
Approved scales: min 0.4µV / digit (VSI).
•
Non-approved scaled: min 0.1µV / digit.
Input amplifier
Input noise 0.3µVp-p, input bias current 10nA typical.
A/D Converter
Sigma delta 550,000 internal counts max. Conversion speed: 3, 7, 14, 28, 57,
70Hz (selectable).
Linearity
Within 0.002% of full scale.
Span temp coefficient
≤
2ppm/°C.
Zero temp coefficient
≤
2ppm/°C.
Long-term stability
0.005% of full scale per year.
1.3 Analog Output (Optional)
If no second analog input (See 1.2 above) is needed, an analog output may be
added. Analog Output is powered by an external 24VDC
(See section 7.1.2 for
specification).
Current or voltage
Selected via jumper JP1 on printed circuit board 761 (see section
7.4).
Current output
0-20 mA or 4-20 mA. Max load resistance 1K
Ω
(line + termination).
Voltage output
0.02-10V. Min load resistance 1K
Ω
.
Resolution
•
Internal: 16 bits.
•
External: 16 bits, or in accordance with regulation.
Linearity
Better than 0.01% of FSR.
Thermal stability
50ppm/°C typical.
Short-circuit
protection
25mA indefinite duration.