JPH0385007U - - Google Patents
Info
- Publication number
- JPH0385007U JPH0385007U JP14621089U JP14621089U JPH0385007U JP H0385007 U JPH0385007 U JP H0385007U JP 14621089 U JP14621089 U JP 14621089U JP 14621089 U JP14621089 U JP 14621089U JP H0385007 U JPH0385007 U JP H0385007U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- converter
- value
- offset measurement
- gain 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.)
- Pending
Links
- 238000013480 data collection Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Description
第１図ａ，ｂ，ｃはこの考案の一実施例のデー
タ収集装置のブロツク図、第２図はこの考案の他
の実施例のデータ収集装置のブロツク図、第３図
は従来のデータ収集装置の入出力特性を示す説明
図、第４図ａ，ｂは従来のデータ収集装置の一例
のブロツク図である。
符号の説明、１……データ収集装置、２……Ｐ
ＧＡ、３……固定ゲインアツプ、４……ＡＤ変換
器、５……計算機、６……検出器、Ｓ１，Ｓａ，
Ｓｂ……スイツチ、Ｇ０……オフセツト測定時の
ＰＧＡのゲイン、Ｇ１……データ測定時のＰＧＡ
のゲイン、Ａ……固定ゲインアンプのゲイン、Ｈ
……ＡＤ変換器の伝達関数、Ｖｏｆｆ１，Ｖｏｆ
ｆ２，Ｖｏｆｆ３……オフセツト電圧。
Figures 1a, b, and c are block diagrams of a data collection device according to one embodiment of this invention, Figure 2 is a block diagram of a data collection equipment according to another embodiment of this invention, and Figure 3 is a conventional data collection device. FIGS. 4a and 4b are block diagrams of an example of a conventional data collection device, which are explanatory diagrams showing the input/output characteristics of the device. Explanation of symbols, 1...Data collection device, 2...P
GA, 3... Fixed gain up, 4... AD converter, 5... Computer, 6... Detector, S 1 , S a ,
S b ... Switch, G 0 ... PGA gain during offset measurement, G 1 ... PGA during data measurement
Gain of A, gain of fixed gain amplifier, H
...Transfer function of AD converter, V off1 , V of
f2 , Voff3 ...Offset voltage.
Claims (1)
と、その可変ゲインアンプより後段でアナログ量
をデジタル値に変えて出力するＡＤ変換器とを有
するデータ収集装置において、 オフセツト測定用電圧として、接地電圧または
交流電圧または直流分と重畳した交流電圧を、可
変ゲインアンプより後段に入力するオフセツト測
定用電圧入力手段と、前記オフセツト測定用電圧
を入力したときのＡＤ変換器の出力値からオフセ
ツト測定用電圧が実質的に接地電圧のときのＡＤ
変換器の出力値Ｄｏｕｔの値を得るＤｏｕｔ値抽
出手段と、データ収集時に得られたＡＤ変換器の
出力値Ｄｄａｔａから前記Ｄｏｕｔ値を減算する
オフセツト補正手段とを具備したことを特徴とす
るデータ収集装置。[Scope of Claim for Utility Model Registration] A data acquisition device that has a variable gain amplifier that amplifies an analog input signal, and an AD converter that converts the analog value into a digital value and outputs it at a stage subsequent to the variable gain amplifier, for offset measurement. Offset measurement voltage input means for inputting a ground voltage, an AC voltage, or an AC voltage superimposed on a DC component as a voltage to a stage subsequent to a variable gain amplifier; and an output value of an AD converter when the offset measurement voltage is input. AD when the voltage for offset measurement is substantially the ground voltage from
It is characterized by comprising a D out value extraction means for obtaining the output value D out of the converter, and an offset correction means for subtracting the D out value from the output value D data of the AD converter obtained at the time of data collection. data collection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14621089U JPH0385007U (en) | 1989-12-19 | 1989-12-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14621089U JPH0385007U (en) | 1989-12-19 | 1989-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0385007U true JPH0385007U (en) | 1991-08-28 |
Family
ID=31692810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14621089U Pending JPH0385007U (en) | 1989-12-19 | 1989-12-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0385007U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006095061A (en) * | 2004-09-29 | 2006-04-13 | Itoki Corp | Desk |
| JP2007296138A (en) * | 2006-04-28 | 2007-11-15 | Itoki Corp | Desk-top rack with lighting |
-
1989
- 1989-12-19 JP JP14621089U patent/JPH0385007U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006095061A (en) * | 2004-09-29 | 2006-04-13 | Itoki Corp | Desk |
| JP2007296138A (en) * | 2006-04-28 | 2007-11-15 | Itoki Corp | Desk-top rack with lighting |
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