50963

Weightec 348 Manual

6
Zoom out
Zoom in
Previous page
1/53
Next page
1.5 MEASURING PRINCIPLE
The A/D converter proceeds according to the unique continuous integrating principle and converts at 436 Hz
the analogue weight signal into a 21 bits digital value.
The 348 has 5 different types of filters for stabilizing the weight data. Amongst these 3 filters especial for the
setpoint comparison with automatic overshoot compensation and one manual settable filter.
The 3 filters for the setpoint comparison are selected in the start command for the setpoints.
The complete A/D conversion, as well as the analogue amplifier system, operates at 218 Hz (sine wave) speed.
The loadcell excitation and the sense return system operate at the same frequency and sine wave.
The measuring system is based upon synchronic detection of the AC signal and continuous integrating ratio
measurement by the A/D converter.
The big advantages of using alternating current with sine wave are the highly insensitivity for disturbances from
external interferences, a very stable zero without any drift and the feature that the loadcell connections may be
made with screw terminals in stead of soldered connections.
1.6 ACCURACY / SPEED
The internal resolution is 2,000,000 counts (21 bit) with a instability (noise)of max 3 count.
The EC legal approval allows for a minimum signal of 0.3 µV per scale division at 5.6 V loadcell excitation.
For a 2 mV/V loadcell this more than 37,000 counts / divisions, resulting in an accuracy of 0.003% of the
measuring range of the loadcell.
The EC Metrology Legislation for Class III weighing instruments limits this value to a maximum of 10,000 counts.
On the internal calibration display the digital weight signal is presented in max. 150,000 divisions.
In the data output max. 15,000 scale divisions available.
The high speed of the complete system, the setpoint comparators included, is 436 Hz (2.3 msec.) and
is independent of the setting of the amplifier (min. 0.25 mV/V full scale input).
1.7 LOADCELL CAPACITY, DEAD LOAD
The input sensitivity may be raised up to 1/8 part of the measuring capacity of a loadcell.
This does not effect the accuracy and the available resolution. The dead load on the loadcell may be
compensated up to 50 % (1 mV/V) of the loadcell capacity. This too does not effect the available resolution of
15,000 external divisions over the chosen input sensitivity.
This means that loadcells with an up to 8 times higher capacity as needed may be applied, moreover with 50%
dead load, without loss of speed or accuracy. This is very important for safeguarding a loadcell against heavy
overload and dynamic impulses and vibrations, simply by choosing a far to high loadcell capacity.
1.8 METROLOGY LEGISLATION CE
Based upon the European Legislation, according to EN 45501 the 348-2 is EC approved and certified by Dutch
NMi Certin with nr. - TC 5164 as part of a weighing machine
- T 5170 as a complete not automatic weighing machine
for max. 10,000 divisions and 0.3 µV per division at >
5.6 VAC excitation and > 58 Ohm input impedance.
The length of the loadcell cable is not
limited. No special EMC precautions are required.
The CE marking of the 348-2 is based on EN 50081-1, EN 50082-1, EN 61000-3-2 and EN 45501.
Manual 348-2 V 3.1 Page 6 01-06-2007
… 6 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Weightec 348 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Weightec 348 in the language / languages: English as an attachment in your email.

The manual is 1,66 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Weightec 348

Weightec 348 User Manual - Dutch - 49 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info