文件名称:frequency_meteris
介绍说明－－下载内容均来自于网络，请自行研究使用
本设计采用直接测频法，通过对被测信号在1S内上升沿数量直接测出其频率，误差在±1HZ,具有简单、直观、误差小等优点。在测量小于1HZ的频率时，由于延时，外界影响等因素影响，有可能计数器会得到1HZ的量，使得数码管显示“L”或“1”，当测出为1HZ时并不能确定其值是否为1HZ，故本设计的下限频率为2HZ，而不是1HZ。占空比测量采用比被测信号小的信号测量，其误差为±1HZ。-This design adopts the direct frequency measurement method, based on measured signal within 1 s rise along the number directly to measure the frequency, the error in the plus or minus 1 hz, has the advantages of simple, intuitive, and small error. When measuring less than 1 hz frequency, due to the delay, outside influence factors, such as possible counter will get 1 hz, digital tube display "L" or "1", when measured as 1 hz and cannot determine whether the value is 1 hz, so the design of the lower frequency of 2 hz, rather than 1 hz. Duty ratio using small signal than the measured signal measurement, the error of plus or minus 1 hz.
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下载文件列表
frequency_meteris
.................\frequency_meteris.vhd.bak
.................\frequency_meteris.qpf
.................\frequency_meteris.qsf
.................\frequency_meteris.vhd
.................\frequency_meteris.map.summary
.................\frequency_meteris.pin
.................\frequency_meteris.fit.smsg
.................\frequency_meteris.fit.summary
.................\frequency_meteris.sof
.................\frequency_meteris.pof
.................\frequency_meteris.tan.summary
.................\frequency_meteris.done
.................\frequency_meteris.dpf
.................\frequency_meteris.map.rpt
.................\frequency_meteris.fit.rpt
.................\frequency_meteris.asm.rpt
.................\frequency_meteris.tan.rpt
.................\frequency_meteris.flow.rpt
.................\frequency_meteris.qws
.................\db
.................\..\frequency_meteris.db_info
.................\..\frequency_meteris.map.ecobp
.................\..\frequency_meteris.sld_design_entry.sci
.................\..\frequency_meteris.cmp_merge.kpt
.................\..\frequency_meteris.eco.cdb
.................\..\frequency_meteris.map.qmsg
.................\..\frequency_meteris.rtlv_sg.cdb
.................\..\frequency_meteris.cmp.rdb
.................\..\frequency_meteris.cbx.xml
.................\..\frequency_meteris.hif
.................\..\frequency_meteris.hier_info
.................\..\frequency_meteris.rtlv_sg_swap.cdb
.................\..\frequency_meteris.cmp0.ddb
.................\..\frequency_meteris.rtlv.hdb
.................\..\frequency_meteris.lpc.txt
.................\..\frequency_meteris.lpc.html
.................\..\frequency_meteris.pre_map.hdb
.................\..\frequency_meteris.cmp.ecobp
.................\..\frequency_meteris.lpc.rdb
.................\..\frequency_meteris.pre_map.cdb
.................\..\frequency_meteris.map_bb.logdb
.................\..\mult_e111.tdf
.................\..\lpm_divide_3gm.tdf
.................\..\sign_div_unsign_dnh.tdf
.................\..\alt_u_div_s5f.tdf
.................\..\add_sub_lkc.tdf
.................\..\add_sub_mkc.tdf
.................\..\frequency_meteris.asm.qmsg
.................\..\frequency_meteris.sgdiff.cdb
.................\..\frequency_meteris.fit.qmsg
.................\..\frequency_meteris.sgdiff.hdb
.................\..\frequency_meteris_global_asgn_op.abo
.................\..\frequency_meteris.cmp.kpt
.................\..\frequency_meteris.cmp.logdb
.................\..\frequency_meteris.tan.qmsg
.................\..\frequency_meteris.tis_db_list.ddb
.................\..\frequency_meteris.sld_design_entry_dsc.sci
.................\..\frequency_meteris.asm_labs.ddb
.................\..\frequency_meteris.map_bb.cdb
.................\..\frequency_meteris.tmw_info
.................\..\prev_cmp_frequency_meteris.map.qmsg
.................\..\frequency_meteris.map.cdb
.................\..\prev_cmp_frequency_meteris.fit.qmsg
.................\..\prev_cmp_frequency_meteris.asm.qmsg
.................\..\prev_cmp_frequency_meteris.tan.qmsg
.................\..\prev_cmp_frequency_meteris.qmsg
.................\..\frequency_meteris.map.logdb
.................\..\frequency_meteris.map_bb.hdb
.................\..\frequency_meteris.map.hdb
.................\..\frequency_meteris.cmp.tdb
.................\..\lpm_divide_28m.tdf
.................\..\sign_div_unsign_9nh.tdf
.................\..\alt_u_div_k5f.tdf
.................\..\frequency_meteris.map.bpm
.................\..\frequency_meteris.cmp2.ddb
.................\..\frequency_meteris.cmp.cdb
.................\..\frequency_meteris.cmp.hdb
.................\..\frequency_meteris.cmp.bpm
.................\..\lpm_divide_eem.tdf
.................\..\sign_div_unsign_olh.tdf
.................\..\alt_u_div_i2f.tdf
.................\..\frequency_meteris.syn_hier_info
.................\..\frequency_meteris.map.kpt
.................\incremental_db
.................\..............\README
.................\..............\compiled_partitions
.................\..............\...................\frequency_meteri