JPH0174566U

JPH0174566U -

Info

Publication number: JPH0174566U
Application number: JP1987169380U
Authority: JP
Priority date: 1987-11-04
Filing date: 1987-11-04
Publication date: 1989-05-19

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示すブロツク図、
第２図ａは第１図に示す被測定信号波形図、第２
図ｂは第１図に示す検波回路出力信号波形図、第
２図ｃ，ｄは第１図に示す微分信号波形図、第２
図ｅ，ｆは第１図に示す比較器の出力波形図、第
２図ｇは第１図に示す論理積回路の出力波形図、
第３図は周波数解析の結果がデイジタルで得られ
る場合の実施例を示すブロツク図、第４図は従来
の一例を示すブロツク図である。１……入力回路、２……周波数変換回路、３…
…ＩＦフイルタ、４……検波回路、５……局部発
振器、６……掃引信号発生回路、７……垂直偏向
回路、８……水平偏向回路、９……ＣＲＴ、１０
……微分器、１１……微分器、１２……比較器、
１３……比較器、１４……論理積回路、１５……
ビデオ回路、１６……ラツチ、１７……比較器、
１１０……入力回路、１２０……周波数変換回路
、１３０……ＩＦフイルタ、１４０……検波回路
、１５０……局部発振器、１６０……掃引信号発
生回路、１７０……垂直偏向回路、１８０……水
平偏向回路、１９０……ＣＲＴ、２００……Ａ／
Ｄ変換器、２１０……メモリ、２２０……ＣＰＵ
、２３０……ビデオ回路、ａ……被測定信号、ｂ
……検波回路出力信号、ｃ……微分信号、ｄ……
微分信号、ｅ……比較器の出力信号、ｆ……比較
器の出力信号、ｇ……論理積回路の出力信号、ｘ
……解析データ、ｙ……ラツチの出力信号、ｈ…
…被測定信号、ｉ……検波回路出力信号。 FIG. 1 is a block diagram showing an embodiment of the present invention.
Figure 2a is a waveform diagram of the measured signal shown in Figure 1;
Figure b is a waveform diagram of the detection circuit output signal shown in Figure 1, Figures 2c and d are differential signal waveform diagrams shown in Figure 1,
Figures e and f are output waveform diagrams of the comparator shown in Figure 1, Figure 2g is an output waveform diagram of the AND circuit shown in Figure 1,
FIG. 3 is a block diagram showing an embodiment in which the results of frequency analysis are obtained digitally, and FIG. 4 is a block diagram showing a conventional example. 1...Input circuit, 2...Frequency conversion circuit, 3...
...IF filter, 4...Detection circuit, 5...Local oscillator, 6...Sweep signal generation circuit, 7...Vertical deflection circuit, 8...Horizontal deflection circuit, 9...CRT, 10
... Differentiator, 11 ... Differentiator, 12 ... Comparator,
13... Comparator, 14... AND circuit, 15...
Video circuit, 16... latch, 17... comparator,
110...Input circuit, 120...Frequency conversion circuit, 130...IF filter, 140...Detection circuit, 150...Local oscillator, 160...Sweep signal generation circuit, 170...Vertical deflection circuit, 180...Horizontal Deflection circuit, 190...CRT, 200...A/
D converter, 210...Memory, 220...CPU
, 230...video circuit, a...signal under test, b
...Detection circuit output signal, c...Differential signal, d...
Differential signal, e... Output signal of the comparator, f... Output signal of the comparator, g... Output signal of the AND circuit, x
...Analysis data, y...Latch output signal, h...
...signal under test, i...detection circuit output signal.

Claims

[Scope of utility model registration request]

a local oscillator, a frequency converter that combines the electrical signal to be measured and the output of the local oscillator, an IF filter that decomposes the output signal of the frequency converter into frequency components containing it, and detects the output signal from the filter. a display means for displaying an output signal from the detector; a differentiating circuit for differentiating the output signal from the detector; detecting when the output of the differentiating circuit changes from a positive value to a negative value; A frequency analysis device comprising: a comparator that outputs a signal.