Electric balance with digital display

• US 5,056,040 A
• Filed: 09/27/1988
• Issued: 10/08/1991
• Est. Priority Date: 10/22/1987
• Status: Expired due to Term

• Current Assignee: Sartorius Gmbh
• Original Assignee: Sartorius AG
• Inventors: Berg, Christoph, Oldendorf, Christian, Melcher, Franz-Josef
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Cosimano, Edward R.
• Application Number:
  US07/249,827
• Time in Patent Office: 1,106 Days
• Field of Search: 177/25.15, 340/794, 364/466, 364/518, 364/567, 364/568
• US Class Current: 702/173
• CPC Class Codes: G01G 23/3721 with particular representation of the result, e.g. graphic
• CPC Class Codes: G06F 3/1407 General aspects irrespective of display type, e.g. determination of decimal point position, display with fixed or driving decimal point, suppression of non-significant zeros
• CPC Class Codes: H03K 21/18 Circuits for visual indication of the result

Abstract

There is disclosed an electric balance with a sensor (2), a digital signal processing unit (4), a digital display (5) and switching means (6) which suppress the leading zeros in the digital display by a control means (7) which activates and deactivates the switching means (6) for suppressing leading zeros as a function of the sign of the result of measuring. In this manner, a change of sign can be signaled more clearly. It is also possible to display more leading zeros as the magnitude of the deviation of the result of measuring from the value zero increases so that the leading zeros appear in several stages, starting from zero up to a set measuring value.

Claims

1. An electric balance comprising:

a sensor (2) for measuring a load on a balance scale (1) and producing a measured result output,

digital signal processing unit (4,4'"'"') responsive to the measured result output of the sensor (2) and having a decade output means which includes an output to indicate the sign of the measured result;

digital display (5) coupled to the digital signal processing unit (4,4'"'"') through the decade output means,

switching means (6) coupled, between the decade output means and the display means (5), to a portion of the output from the decade output means to suppress the leading zeros supplied to the digital display (5), and wherein the switching means (6) for the suppression of leading zeros consist of a control input means (7) which selectively activates and deactivates the switching means (6) for the suppression of the leading zeros derived according to the sign of the measured result output.

2. Electric balance according to claim 1, wherein the control means (7) deactivates the switching means (6) for suppression of the leading zeros in the case of a negative sign signal of the measured result output and that if suppression of the leading zeros is deactivated, "minus" signs are displayed at least partially instead of the leading zeros.

3. Electric balance according to claim 1 wherein a tare memory (9) is included in the digital signal processing unit (4,4'"'"') and the control input means (7) is only activated when the tare memory (9) is used.

4. Electric balance according to claim 1 or 3 wherein the switching means (6) for the suppression of the leading zero occurs in several stages, in which instance one of the leading zeros is displayed in each stage and that the control input means (7) activates one of the stages of the suppression of the leading zeros as a function of the sign signal of the measured result output and as a function of a magnitude of deviation of the measured result output from value zero.

5. Electric balance according to claim 4, wherein a case of a non-positive measured result output, all the leading zeros are suppressed, that as a result of measuring of +1 digit, one less of the leading zeros is suppressed, that as the measured result output of +2 digits, two less of the leading zeros are suppressed, and so forth.