Technical Specifications
Analog Input
VT400 Technical Manual, Rev. A5 15 Doc # UM-VT400-EN
1.2 Analog Input
Load cell excitation ±5V switched polarity or +5VDC with sense.
Connection 6-wire technique. Max 10 load cells 350Ohm 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)
Power supply External 24VDC, Main instrument PSU can be used.
Current or voltage
Selected via jumper JP1 on printed circuit board 761 (see section 7.4).
Current output 0-20mA or 4-20mA. Max load resistance 1KΩ (line + termination).
Voltage output 0.02-10V. Min load resistance 1KΩ (This is the default output).
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.
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