发明授权
- 专利标题: Frequency and instantaneous voltage level meter
- 专利标题(中): 频率和瞬时电压电平表
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申请号: US955348申请日: 1992-10-01
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公开(公告)号: US5412312A公开(公告)日: 1995-05-02
- 发明人: Matthew M. Crass , Robert D. Braun
- 申请人: Matthew M. Crass , Robert D. Braun
- 申请人地址: WI Kenosha
- 专利权人: Snap-on Incorporated
- 当前专利权人: Snap-on Incorporated
- 当前专利权人地址: WI Kenosha
- 主分类号: G01R13/40
- IPC分类号: G01R13/40 ; G01R15/12 ; G01R19/00 ; G01R29/00
摘要:
A volt/frequency meter includes LED arrays which provide bar-graph style meter displays of the instantaneous voltage and the frequency of a variable electric analog signal. Each LED in the voltage array corresponds to a predetermined voltage range and each LED in the frequency array corresponds to a predetermined frequency range. The meter is switchable among three different voltage scales and three different frequency scales. A separate LED flashes momentarily in response to the input signal crossing a user-determined limit set point which is adjusted through a knob on the front panel. The limit set point controls the operation of the frequency display such that the displayed frequency is the rate at which the analog signal crosses the limit set point.
公开/授权文献
- US5957723A Cordless electric kettle 公开/授权日:1999-09-28
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