JPH07946Y2 - AC voltmeter - Google Patents

AC voltmeter

Info

Publication number
JPH07946Y2
JPH07946Y2 JP8921688U JP8921688U JPH07946Y2 JP H07946 Y2 JPH07946 Y2 JP H07946Y2 JP 8921688 U JP8921688 U JP 8921688U JP 8921688 U JP8921688 U JP 8921688U JP H07946 Y2 JPH07946 Y2 JP H07946Y2
Authority
JP
Japan
Prior art keywords
switch
capacitor
converter
range switching
switching amplifier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP8921688U
Other languages
Japanese (ja)
Other versions
JPH029878U (en
Inventor
真人 長島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advantest Corp
Original Assignee
Advantest Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Advantest Corp filed Critical Advantest Corp
Priority to JP8921688U priority Critical patent/JPH07946Y2/en
Publication of JPH029878U publication Critical patent/JPH029878U/ja
Application granted granted Critical
Publication of JPH07946Y2 publication Critical patent/JPH07946Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Measurement Of Current Or Voltage (AREA)

Description

【考案の詳細な説明】 「産業上の利用分野」 この考案は被測定電圧をレンジ切替増幅器で増幅し、そ
の増幅出力をコンデンサを通じてAC/DC変換器へ供給
し、そのAC/DC変換器の出力をデジタル変換して表示す
る交流電圧計に関する。[Detailed description of the device] "Industrial application field" This device amplifies the measured voltage with a range switching amplifier, supplies the amplified output to an AC / DC converter through a capacitor, and The present invention relates to an AC voltmeter that digitally converts and displays an output.

「従来の技術」 従来の交流電圧計は第２図に示すように入力端子11から
の被測定電圧はレンジ切替増幅器12で増幅されてAC/DC
変換器13へ供給され、交流電圧が直流電圧に変換され、
AC/DC変換器13の出力直流電圧はA/D変換器14でデジタル
値に変換され、そのデジタル値が表示される。“Prior Art” In the conventional AC voltmeter, the measured voltage from the input terminal 11 is amplified by the range switching amplifier 12 as shown in FIG.
Is supplied to the converter 13, the AC voltage is converted to a DC voltage,
The output DC voltage of the AC / DC converter 13 is converted into a digital value by the A / D converter 14, and the digital value is displayed.

このような交流電圧計においてはレンジ切替増幅器１入
力でレンジ切替えを行うと、レンジ切替増幅器12のオフ
セット電圧も変り、その影響が誤差になって現われる。
そこで第３図に示すようにAC/DC変換器13の直前にコン
デンサ15を挿入してオフセット電圧の影響を避けてい
た。In such an AC voltmeter, when the range is switched with the input of the range switching amplifier 1, the offset voltage of the range switching amplifier 12 is also changed, and the effect appears as an error.
Therefore, as shown in FIG. 3, a capacitor 15 is inserted immediately before the AC / DC converter 13 to avoid the influence of the offset voltage.

このようにコンデンサ15を用いればレンジ切替増幅器12
でのオフセット電圧の影響を受けずにすむが、コンデン
サ15のセットリング時間がかゝるためレンジを切替えて
直ちに測定することはできない。If the capacitor 15 is used in this way, the range switching amplifier 12
However, since the settling time of the capacitor 15 is long, the range cannot be switched and immediate measurement cannot be performed.

「課題を解決するための手段」 この考案によればレンジ切替増幅器とコンデンサとの間
に第１スイッチが直列に挿入され、その第１スイッチと
並列にチャージアップ増幅器が第２、第３スイッチを介
して接続され、コンデンサ及びAC/DC変換器の接続点と
接地との間に第４スイッチが接続される。According to the present invention, the first switch is inserted in series between the range switching amplifier and the capacitor, and the charge-up amplifier includes the second and third switches in parallel with the first switch. The fourth switch is connected between the connection point of the capacitor and the AC / DC converter and the ground.

「実施例」 第１図はこの考案の実施例を示し、第３図と対応する部
分には同一符号を付けてある。この考案においてはレン
ジ切替増幅器12とコンデンサ15との間において第１スイ
ッチK1が直列に挿入される。第１スイッチK1と並列にチ
ャージアップ増幅器16が第２、第３スイッチK2，K3を介
して接続される。コンデンサ15及びAC/DC変換器13の接
続点と接地との間に第４スイッチK4が接続される。[Embodiment] FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. In the present invention, a first switch K 1 is inserted in series between the range switching amplifier 12 and the capacitor 15. The charge-up amplifier 16 is connected in parallel with the first switch K 1 via the second and third switches K 2 , K 3 . The fourth switch K 4 is connected between the connection point of the capacitor 15 and the AC / DC converter 13 and the ground.

この構成は次のように動作する。レンジ切替増幅器12の
レンジが切替えられると、第１スイッチK1がオフとさ
れ、第４スイッチK4がオンとされ、第２スイッチK2、第
３スイッチK3がオンとされてチャージアップ増幅器16を
通じてレンジ切替増幅器12のオフセット電圧がコンデン
サ15に充電される。その後、第４スイッチK4がオフとさ
れ、第３スイッチK3、第２スイッチK2がオフとされ、第
１スイッチK1がオンとされた後、被測定電圧が入力端子
11へ印加され、通常の測定が行われる。This configuration operates as follows. When the range of the range switching amplifier 12 is switched, the first switch K 1 is turned off, the fourth switch K 4 is turned on, the second switch K 2 and the third switch K 3 are turned on, and the charge-up amplifier is turned on. The offset voltage of the range switching amplifier 12 is charged in the capacitor 15 through 16. After that, the fourth switch K 4 is turned off, the third switch K 3 and the second switch K 2 are turned off, and the first switch K 1 is turned on.
Applied to 11 and normal measurements are taken.

このようにこの考案によればレンジを切替えるたびにチ
ャージアップ増幅器16を通じてコンデンサ15に対する充
電が急速に行われるため、レンジ切替増幅器12のオフセ
ット電圧に影響を受けずに高速度に交流電圧を測定する
ことができる。As described above, according to the present invention, the capacitor 15 is rapidly charged through the charge-up amplifier 16 every time the range is switched, so that the AC voltage is measured at high speed without being affected by the offset voltage of the range switching amplifier 12. be able to.

「考案の効果」 以上述べたようにこの考案によればレンジを切替えるた
びにチャージアップ増幅器16を通じてコンデンサ15に対
してオフセット電圧を急速に充電することができ、レン
ジ切替増幅器12のオフセット電圧に影響されずに高速度
に交流電圧を測定することができる。[Advantage of Device] As described above, according to this device, the offset voltage can be rapidly charged to the capacitor 15 through the charge-up amplifier 16 every time the range is switched, and the offset voltage of the range switching amplifier 12 is affected. The AC voltage can be measured at a high speed without the need.

【図面の簡単な説明】[Brief description of drawings]

第１図はこの考案の実施例を示すブロック図、第２図及
び第３図はそれぞれ従来の交流電圧計を示すブロック図
である。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing a conventional AC voltmeter.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】被測定電圧をレンジ切替増幅器で増幅し、
その増幅出力をコンデンサを通じてAC/DC変換器へ供給
し、そのAC/DC変換器の出力をデジタル変換して表示す
る交流電圧計において、 上記レンジ切替増幅器とコンデンサとの間に直列に挿入
された第１スイッチと、 その第１スイッチと並列に、第２、第３スイッチを介し
て接続されたチャージアップ増幅器と、 上記コンデンサ及びAC/DC変換器の接続点と接地との間
に接続された第４スイッチとを有する交流電圧計。1. A voltage to be measured is amplified by a range switching amplifier,
An AC voltmeter that supplies the amplified output to an AC / DC converter through a capacitor and digitally converts and displays the output of the AC / DC converter, which was inserted in series between the range switching amplifier and the capacitor. A first switch, a charge-up amplifier connected in parallel to the first switch via second and third switches, and a connection point between the capacitor and the AC / DC converter and ground. An AC voltmeter having a fourth switch.
JP8921688U 1988-07-04 1988-07-04 AC voltmeter Expired - Lifetime JPH07946Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8921688U JPH07946Y2 (en) 1988-07-04 1988-07-04 AC voltmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8921688U JPH07946Y2 (en) 1988-07-04 1988-07-04 AC voltmeter

Publications (2)

Publication Number Publication Date
JPH029878U JPH029878U (en) 1990-01-22
JPH07946Y2 true JPH07946Y2 (en) 1995-01-11

Family

ID=31313768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8921688U Expired - Lifetime JPH07946Y2 (en) 1988-07-04 1988-07-04 AC voltmeter

Country Status (1)

Country Link
JP (1) JPH07946Y2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4977741B2 (en) * 2009-09-03 2012-07-18 Ｎｅｃアクセステクニカ株式会社 Current detector

Also Published As

Publication number Publication date
JPH029878U (en) 1990-01-22

Similar Documents

Publication Publication Date Title
JPH07946Y2 (en) AC voltmeter
JPH057582Y2 (en)
JPS63190975U (en)
JP2802814B2 (en) Resistance measuring instrument
JPH0635183Y2 (en) Digital Multimeters
JPH089618Y2 (en) Thermistor temperature conversion circuit
JPS63133069A (en) Apparatus for measuring dc difference voltage
JPH041445Y2 (en)
JP2514235Y2 (en) Amplifier circuit
JPS641648Y2 (en)
JPH0641180Y2 (en) Amplifier electrical characteristics measuring device
JPS6133523Y2 (en)
JPH0573575U (en) Phase angle transducer
JPH0313741Y2 (en)
JPH02150575U (en)
JPS62135775A (en) Difference voltage measuring circuit
JPH05264610A (en) Peak detecting circuit
JPH03127272U (en)
JPS6421516U (en)
JPS6244567U (en)
JPS63175869U (en)
JPS5857974U (en) voltage measurement circuit
JPS58140441U (en) Temperature detection device for rotating body
JPS63175870U (en)
JPH03128333U (en)