JPH0314773U

JPH0314773U -

Info

Publication number: JPH0314773U
Application number: JP7369189U
Authority: JP
Priority date: 1989-06-23
Filing date: 1989-06-23
Publication date: 1991-02-14

Description

[Brief explanation of drawings]

第１図は本実施例の周波数測定装置の具体的構
成例を示すブロツク回路図、第２図はキヤリア調
整の様子を説明するための波形図、第３図は実施
例装置の各部のタイミングチヤート、第４図はキ
ヤリア調整の際にオシロスコープの表示面に示さ
れる波形図、第５図はデビエーシヨン調整の様子
を説明するための波形図、第６図はデビエーシヨ
ン調整の際にオシロスコープの表示面に示される
波形図、第７図は周波数スペクトルを示す図であ
る。３，１６……切換スイツチ、４……Ｕオシレー
タ、５……Ｃオシレータ、６……Ｌオシレータ、
７〜１２……単安定マルチバイブレータ、１３…
…切換回路、１４，１５……ＡＮＤゲート、１７
，１８……フリツプフロツプ、１９……反転検出
回路、２０……切換コントロール回路、２１……
切換選択スイツチ、２２……イネーブル回路、２
３……偏移／キヤリア設定回路、２６……復調器
、４０……位相一致検出手段、５０……切換制御
手段。 Fig. 1 is a block circuit diagram showing a specific configuration example of the frequency measuring device of this embodiment, Fig. 2 is a waveform diagram for explaining the carrier adjustment, and Fig. 3 is a timing chart of each part of the device of the embodiment. , Figure 4 is a waveform diagram shown on the oscilloscope display screen during carrier adjustment, Figure 5 is a waveform diagram to explain how deviation adjustment is performed, and Figure 6 is a waveform diagram shown on the oscilloscope display screen during deviation adjustment. The waveform diagram shown in FIG. 7 is a diagram showing a frequency spectrum. 3, 16...Switchover switch, 4...U oscillator, 5...C oscillator, 6...L oscillator,
7-12... Monostable multivibrator, 13...
...Switching circuit, 14, 15...AND gate, 17
, 18... flip-flop, 19... reversal detection circuit, 20... switching control circuit, 21...
Changeover selection switch, 22...Enable circuit, 2
3... Deviation/carrier setting circuit, 26... Demodulator, 40... Phase coincidence detection means, 50... Switching control means.

Claims

[Claims for Utility Model Registration] Switching means to which a frequency-modulated signal under measurement and first and second reference signals are supplied, and which switches and outputs these signals; and demodulates the output of the switching means. a demodulator for performing frequency measurement; a phase coincidence detection means for detecting phase coincidence between the signal under test and the first or second reference signal; and switching control means for controlling switching of the switching means, and the phase coincidence detection means detects phase coincidence between the signal under test and the first or second reference signal having a different frequency, and outputs the coincidence detection output. A frequency measuring device characterized in that the switching control means performs switching control on the switching means based on the following.