JP2007155679A - Electronic balance - Google Patents

Electronic balance Download PDF

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JP2007155679A
JP2007155679A JP2005355345A JP2005355345A JP2007155679A JP 2007155679 A JP2007155679 A JP 2007155679A JP 2005355345 A JP2005355345 A JP 2005355345A JP 2005355345 A JP2005355345 A JP 2005355345A JP 2007155679 A JP2007155679 A JP 2007155679A
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specific gravity
value
liquid
sample
weight
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JP4631686B2 (en
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Tetsuro Kusumoto
哲朗 楠本
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Shimadzu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic balance capable of displaying a specific gravity measured value with a place number of significant digits. <P>SOLUTION: A weight weighed value W<SB>a</SB>of a sample S in air, and a weight weighed value W<SB>1</SB>of the sample S in a liquid by elevating a water vessel 2 storing the liquid having a known specific gravity value ρ<SB>W</SB>are weighed to calculate a specific gravity value ρ of the sample pursuant to a computation expression ρ=ρ<SB>W</SB>W<SB>a</SB>/(W<SB>a</SB>-W<SB>1</SB>). A place number of a weight weighed value (W<SB>a</SB>-W<SB>1</SB>) is compared with a place number of the weight weighed value W<SB>a</SB>to make the smaller place number or the place number when those are the same serve as the significant place number of the specific gravity value ρ, and the specific gravity value ρ is displayed or printed with the significant place number. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電子天びんに関し、特に固体または液体試料の比重を測定する電子天びんに関する。   The present invention relates to an electronic balance, and more particularly to an electronic balance for measuring the specific gravity of a solid or liquid sample.

従来、試料の比重測定方法として一般に液浸法がよく用いられている。この液浸法は例えば固体試料の場合、液体中に存在する試料が試料と同じ体積の液体の重量に等しい浮力を受けることを利用したもので空気中で計量した試料を液体中に吊るして計量し、これらの計量結果と液体の比重から試料の比重を求めるもので、固体試料の比重ρは次式（１）から求められる。
ρ＝ρwＷa／（Ｗa−Ｗ1）・・・（１）
上式において、Ｗaは空気中で計量した試料の重量、Ｗ1は液体中で計量した試料の重量、ρwは使用した液体の比重を表している。
また、液体試料の比重ρ1は次式（２）から求められる。
ρ1＝（Ｍa−Ｍ1）／Ｖ・・・（２）
上式において、Ｍaは空気中で測定した沈錘の重量、Ｍ1は液体中で測定した沈錘の重量、Ｖは使用した沈錘の体積を表している。 Conventionally, the immersion method is often used as a method for measuring the specific gravity of a sample. For example, in the case of a solid sample, this immersion method is based on the fact that a sample present in a liquid receives buoyancy equal to the weight of the liquid of the same volume as the sample. Then, the specific gravity of the sample is obtained from these measurement results and the specific gravity of the liquid, and the specific gravity ρ of the solid sample is obtained from the following equation (1).
ρ = ρ w W a / (W a −W 1 ) (1)
In the above equation, W a represents the weight of the sample weighed in air, W 1 represents the weight of the sample weighed in the liquid, and ρ w represents the specific gravity of the liquid used.
Further, the specific gravity ρ 1 of the liquid sample is obtained from the following equation (2).
ρ 1 = (M a −M 1 ) / V (2)
In the above equation, M a represents the weight of the weight measured in air, M 1 represents the weight of the weight measured in the liquid, and V represents the volume of the weight used.

図４は液浸法により試料Ｓの比重を測定する電子天びんの概略構成を示す正面図（Ａ）と側面図（Ｂ）である。この電子天びんは、天びん本体１Ａと、比重既知の液体を収容した水槽２と、この水槽２を上下方向に駆動する駆動部３と、水槽２を載せる受け台４と、前記天びん本体１Ａと駆動部３を所定位置に固設する架台５から構成されている。また、液体試料の比重を測定する場合は、前記試料Ｓが沈錘となり、水槽２には被測定液体が収容される。前記天びん本体１Ａは、前記駆動部３を制御し固体の試料Ｓの比重測定を行う機能を備えており、図４及び図５に示すフローチャート図を参照してその手順を以下に説明する。   FIG. 4 is a front view (A) and a side view (B) showing a schematic configuration of an electronic balance for measuring the specific gravity of the sample S by the immersion method. This electronic balance includes a balance main body 1A, a water tank 2 containing a liquid with a known specific gravity, a drive unit 3 for driving the water tank 2 in the vertical direction, a cradle 4 for placing the water tank 2, and the balance main body 1A. It is comprised from the mount frame 5 which fixes the part 3 to a predetermined position. When measuring the specific gravity of the liquid sample, the sample S becomes a weight, and the liquid to be measured is stored in the water tank 2. The balance body 1A has a function of controlling the drive unit 3 and measuring the specific gravity of the solid sample S, and the procedure will be described below with reference to the flowcharts shown in FIGS.

先ず試料Ｓを天びん本体１Ａから下ろしたリードに吊るした後（Ｓ１）、操作ボタン１６を押して比重測定をスタートさせる（Ｓ２）。最初空気中の試料Ｓの重量を計量しこの計量値を記憶する（Ｓ３）。次に水槽２を駆動部３により上昇させて試料Ｓを液中に入れた後（Ｓ４）、液中の試料Ｓの重量を計量しこの計量値を記憶する(Ｓ５)。そして前記（１）式により比重計算を行い表示部１７に試料Ｓの比重値を表示するとともに、プリンタ（図示省略）に出力信号を送出して試料Ｓの比重値ρを始め空気中の重量計量値Ｗa、液中の重量計量値Ｗ1および使用液体の比重値ρw等をプリントした後（Ｓ６）、水槽２を下降させ試料Ｓを液中から取り出す（Ｓ７）。 First, after suspending the sample S on the lead lowered from the balance body 1A (S1), the operation button 16 is pressed to start the specific gravity measurement (S2). First, the weight of the sample S in the air is weighed and the measured value is stored (S3). Next, after the water tank 2 is raised by the drive unit 3 and the sample S is put in the liquid (S4), the weight of the sample S in the liquid is measured and the measured value is stored (S5). Then, the specific gravity is calculated by the above equation (1), the specific gravity value of the sample S is displayed on the display unit 17, and the output signal is sent to the printer (not shown) to start the specific gravity value ρ of the sample S and to measure the weight in the air. After printing the value W a , the weight measurement value W 1 in the liquid, the specific gravity value ρ w of the liquid used (S6), the water tank 2 is lowered and the sample S is taken out from the liquid (S7).

特開平１０−７３５２５号公報Japanese Patent Laid-Open No. 10-73525 特開平１０−２７４６１５号公報Japanese Patent Laid-Open No. 10-274615

従来の電子天びんでは、試料の空気中および液中での重量の計量値に関係なく表示部１７の桁数と同じ桁数で比重値を表示しており、温度誤差などの誤差要因は別として意味の無い桁数までが表示されており、どこまでが計算上有効なデータなのかわからないという問題があった。
本発明は、このような事情に鑑みてなされたものであって、比重値がその有効桁数の範囲内で表示される電子天びんを提供することを目的とする。 In conventional electronic balances, the specific gravity value is displayed with the same number of digits as the number of digits on the display unit 17 regardless of the weight value of the sample in the air and in the liquid, apart from error factors such as temperature error. There was a problem that the number of meaningless digits was displayed, and it was not known how much data was valid for calculation.
The present invention has been made in view of such circumstances, and an object thereof is to provide an electronic balance in which a specific gravity value is displayed within the range of the effective number of digits.

上記の目的を達成するため、本発明の電子天びんは、液浸法による比重測定を行う手段と、比重測定を行う固体試料の空気中及び液中の重量計量値およびその液体比重値から算出される固体試料の比重値あるいは、沈錘の空気中及び液中の重量計量値、及び沈錘体積から算出される液体試料の比重値の有効桁数を判定する有効桁数判定手段を備え、その有効桁数に対応した試料の比重値を表示するものである。
前記有効桁数判定手段は固体試料の場合、空気中の重量計量値の桁数もしくは空気中の重量計量値から液中の重量計量値を引き算した値の桁数のいずれか少ない方の桁数を比重値の有効桁数と判定し、液体試料の場合、沈錘の空気中の重量計量から液中の重量計量値を引き算した値の桁数を比重値の有効桁数と判定するものである。 In order to achieve the above object, the electronic balance of the present invention is calculated from means for measuring the specific gravity by the immersion method, weight measurement values in the air and liquid of the solid sample for which the specific gravity measurement is performed, and the liquid specific gravity value. Effective digit number determining means for determining the effective digit number of the specific gravity value of the liquid sample calculated from the specific gravity value of the solid sample or the weight measurement value of the sink weight in the air and in the liquid, and the weight volume of the sink weight, The specific gravity value of the sample corresponding to the effective number of digits is displayed.
In the case of a solid sample, the effective digit number determining means is the lesser of the number of digits of the weight value in air or the number of digits obtained by subtracting the weight value in liquid from the weight value in air. Is determined as the number of significant digits of the specific gravity value.In the case of a liquid sample, the number of digits obtained by subtracting the weight measurement value in the liquid from the weight measurement in the air of the weight is determined as the effective number of specific gravity values. is there.

本発明の電子天びんは、自動的に計算された有効桁数で比重値が表示またはプリントされるので、比重値を測定する場合に温度などの他の誤差要因は別にして、電子天びんの分解能と試料の質量・比重からどの桁までが計算上有効なデータなのか、すなわち、比重測定の計算上の精度がどこまであるのかを明確に知ることができる。   Since the electronic balance of the present invention displays or prints the specific gravity value with the automatically calculated effective number of digits, when measuring the specific gravity value, apart from other error factors such as temperature, the resolution of the electronic balance It is possible to clearly know up to what digit from the mass / specific gravity of the sample is the data effective in calculation, that is, to what extent the calculation accuracy of the specific gravity measurement is.

本発明が提供する最良の形態の電子天びんは、液浸法による比重測定を行うものであって、固体試料の空気中の重量計量値の桁数もしくは空気中の重量計量値から液中の重量計量値を引き算した値の桁数のいずれか少ない方の桁数を有効桁数と判定し、その有効桁数に対応した比重を表示するもので、固体試料の場合、空気中の重量計量値の桁数もしくは空気中の重量計量値から液中の重量計量値を引き算した値の桁数のいずれか少ない方の桁数を比重値の有効桁数と判定し、液体試料の場合、沈錘の空気中の重量計量から液中の重量計量値を引き算した値の桁数を比重値の有効桁数と判定するものである。   The electronic balance of the best mode provided by the present invention measures the specific gravity by the liquid immersion method, and the weight of the solid sample is determined from the number of digits of the weight measurement value in the air or the weight measurement value in the air. The number of digits less than the value obtained by subtracting the measured value is determined as the effective number of digits, and the specific gravity corresponding to the effective number of digits is displayed. For solid samples, the weight measurement value in air The number of digits or the value obtained by subtracting the weight measurement value in liquid from the weight measurement value in air, whichever is smaller, is determined as the effective number of specific gravity values. The number of digits of the value obtained by subtracting the weight measurement value in the liquid from the weight measurement in the air is determined as the effective number of specific gravity values.

以下、本発明の実施例による電子天びんを図面を参照しながら説明する。図１は本電子天びんの機構構成を示す正面図（Ａ）とその上面図（Ｂ）である。本電子天びんは図４に示した電子天びんと同様に架台５の上部に天びん本体１、下部に水槽２を載置した受け台４を上下方向に移動させる駆動部３を固設し、前記天びん本体１の上面部には、比重測定をスタートさせる操作ボタン１６、空気中および液中の試料の重量計量値（以後、計量値と称す）Ｗa、Ｗ1および試料Ｓの比重ρを表示する表示器１７ａ、１７ｂ、１７ｃからなる表示部１７、測定結果をプリントするプリンタ１８などが配設されている。 Hereinafter, an electronic balance according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view (A) and a top view (B) showing a mechanism configuration of the electronic balance. As in the electronic balance shown in FIG. 4, this electronic balance is provided with a driving unit 3 for moving a cradle 4 having a balance body 1 and a water tank 2 placed on the upper part of the gantry 5 in the vertical direction. On the upper surface of the main body 1, an operation button 16 for starting specific gravity measurement, weight measurement values (hereinafter referred to as measurement values) W a and W 1 of a sample in air and liquid, and a specific gravity ρ of the sample S are displayed. A display unit 17 including displays 17a, 17b, and 17c, a printer 18 that prints measurement results, and the like are arranged.

図２に前記天びん本体１の比重測定制御システムの構成をブロック図で示す。本天びん本体１は、試料Ｓの重量を検出する荷重センサ１１からの検出信号を増幅器１２で増幅した後、Ａ／Ｄ変換器１３でディジタル信号に変換する。このディジタル信号は入出力インターフェース１４を介して操作ボタン１６から入力された入力信号とともにＣＰＵ１５ａ、記憶装置ＲＯＭ１５ｂおよびＲＡＭ１５ｃからなる演算処理装置１５で演算処理され、その演算処理結果は前記入出力インターフェース１４を介して表示部１７および駆動部３に出力される。   FIG. 2 is a block diagram showing the configuration of the specific gravity measurement control system of the balance body 1. The main balance 1 amplifies a detection signal from a load sensor 11 that detects the weight of the sample S by an amplifier 12 and then converts the detection signal to a digital signal by an A / D converter 13. This digital signal is arithmetically processed by the arithmetic processing unit 15 including the CPU 15a, the storage device ROM 15b and the RAM 15c together with the input signal input from the operation button 16 via the input / output interface 14, and the arithmetic processing result is input to the input / output interface 14. To the display unit 17 and the drive unit 3.

前記ＲＯＭ１５ｂには、前記（１）式により演算された比重値ρの有効桁数を判定する有効桁数判定手段がプログラムとして書き込まれている。この有効桁数判定手段は、（１）式の分子の空気中の計量値Ｗaおよび分母の空気中の計量値と液中の計量値との差（Ｗa−Ｗ1）の有効数字の桁数を求め、その桁数が異なる場合はその小さい方の桁数、また桁数が同じ場合はその桁数を比重値ρの有効桁数と判定するものである。この場合、液体比重よりも試料Ｓの比重が大きいときは計量値の差（Ｗa−Ｗ1）の有効桁数は計量値Ｗaの有効桁数以下となり、液体比重よりも試料Ｓの比重が小さいときは計量値Ｗaの有効桁数は計量値の差（Ｗa−Ｗ1）の有効桁数以下となる。 In the ROM 15b, effective digit number determining means for determining the effective number of specific gravity values ρ calculated by the equation (1) is written as a program. This effective digit number determination means is a function for determining the effective value of the measured value W a of the numerator in equation (1) and the difference between the measured value of the denominator in air and the measured value in liquid (W a −W 1 ). The number of digits is obtained, and when the number of digits is different, the smaller number of digits is determined, and when the number of digits is the same, the number of digits is determined as the number of effective digits of the specific gravity value ρ. In this case, when the specific gravity of the sample S is larger than the liquid specific gravity, the effective digit number of the measurement value difference (W a −W 1 ) is less than the effective digit number of the measurement value W a , and the specific gravity of the sample S is higher than the liquid specific gravity. When is small, the number of significant digits of the measured value W a is less than the number of significant digits of the difference of the measured values (W a −W 1 ).

例えば、計量値Ｗaが１０６．２３ｇ、計量値Ｗ1が８７．６６ｇの場合には、計量値差（Ｗa−Ｗ1）は１８．５７ｇ、その有効桁数は４桁となり、試料Ｓの比重値ρは有効桁数４桁で５．７２０として表示される。 For example, when the measured value W a is 106.23 g and the measured value W 1 is 87.66 g, the measured value difference (W a −W 1 ) is 18.57 g, the number of significant digits is 4, and the sample S The specific gravity value ρ is displayed as 5.720 with 4 significant digits.

上記有効桁数判定手段を用いて試料Ｓの比重値ρを測定する手順を図１、図２及び図３のフローチャート図を参照しながら説明する。先ず試料Ｓを天びん本体１に吊るした後（Ｓ１）、操作ボタン１６を押して比重測定をスタートさせると（Ｓ２）、先ず空気中での試料Ｓの重量を計量し、その計量値Ｗaとその桁数、すなわち有効桁数がＲＡＭ１５ｃに記憶されるとともに計量値Ｗaが表示器１７ａに表示される（Ｓ３）。次に水槽２を駆動部３により上昇させ（Ｓ４）、液中での試料Ｓの重量を計量し、その計量値Ｗ1とその有効桁数がＲＡＭ１５ｃに記憶されるとともに計量値Ｗ1が表示器１７ｂに表示される(Ｓ５)。そして前記（１）式により比重ρの計算を行い、この値がＲＡＭ１５ｃに記憶される（Ｓ６）。次に計量値差（Ｗa−Ｗ1）を算出し、その桁数と計量値Ｗaとの桁数を比較し、異なる場合は小さい方の桁数、等しい場合はその桁数を比重値ρの有効桁数と判定する（Ｓ７）。そして、有効桁数での比重値ρを表示器１７ｃに表示するとともに、プリンタ１８に重量Ｗa、Ｗ1、有効桁数での比重値ρをプリントし(Ｓ８)、水槽２を下降させて試料Ｓを液中から取り出す（Ｓ９）。 A procedure for measuring the specific gravity value ρ of the sample S using the effective digit number determining means will be described with reference to the flowcharts of FIGS. First, after the sample S is suspended from the balance body 1 (S1), the specific gravity measurement is started by pressing the operation button 16 (S2). First, the weight of the sample S in the air is measured, and its measured value W a and digits, i.e. number of significant digits weighing W a is displayed on the display unit 17a while being stored in RAM15c (S3). Then raising the water tub 2 by the drive unit 3 (S4), and weighed in the sample S in the liquid, displayed weighing value W 1 with its metric W 1 its effective digits are stored in RAM15c It is displayed on the device 17b (S5). Then, the specific gravity ρ is calculated by the equation (1), and this value is stored in the RAM 15c (S6). Next, the measurement value difference (W a −W 1 ) is calculated, the number of digits is compared with the number of digits of the measurement value W a, and if they are different, the smaller number of digits is used. The number of significant digits of ρ is determined (S7). The specific gravity value ρ in the number of significant digits is displayed on the display 17c, and the weights W a and W 1 and the specific gravity value ρ in the number of significant digits are printed on the printer 18 (S8), and the water tank 2 is lowered. The sample S is taken out from the liquid (S9).

また、液体試料の比重を求める場合には、沈錘の空気中で測定した重量Ｍaと液体試料中での測定した重量Ｍ1との差の桁数を液体比重ρ1の有効桁数と判定し表示するものである。 When calculating the specific gravity of the liquid sample, the number of digits of the difference between the weight M a measured in the air of the sink and the weight M 1 measured in the liquid sample is calculated as the effective number of the liquid specific gravity ρ 1. It is determined and displayed.

以上、本発明の実施例を説明したが、本発明は上記実施例に限定されるものではなく、種々の変形が可能である。例えば、天びん本体１の表示部１７の表示器として表示器１７ｃだけにして、自動または操作ボタンによる手動操作により計量値Ｗa、Ｗ1、比重値ρを順次切り替えて表示させるようにしてもよい。 As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various deformation | transformation is possible. For example, only the display unit 17c may be used as the display unit 17 of the balance body 1, and the weighing values W a and W 1 and the specific gravity value ρ may be sequentially switched and displayed automatically or manually by an operation button. .

本発明は固体試料の比重を測定する電子天びんに用いられる。   The present invention is used for an electronic balance for measuring the specific gravity of a solid sample.

本発明の電子天びんの構成を示す正面図（Ａ）と上面図（Ｂ）である。FIG. 2 is a front view (A) and a top view (B) showing the configuration of the electronic balance of the present invention. 天びん本体の測定制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the measurement control system of a balance main body. 本発明の電子天びんによる比重測定の手順を示すフローチャート図である。It is a flowchart figure which shows the procedure of specific gravity measurement by the electronic balance of this invention. 従来の比重測定用電子天びんの構成例を示す正面図（Ａ）と側面図（Ｂ）である。It is the front view (A) and the side view (B) which show the structural example of the conventional electronic balance for specific gravity measurement. 従来の電子天びんによる比重測定の手順を示すフローチャート図である。It is a flowchart figure which shows the procedure of specific gravity measurement by the conventional electronic balance.

符号の説明Explanation of symbols

１ 天びん本体
１Ａ 天びん本体
２ 水槽
３ 駆動部
４ 受け台
５ 架台
１１ 荷重センサ
１２ 増幅器
１３ Ａ／Ｄ変換器
１４ 入出力インターフェース
１５ 演算処理装置
１５ａ ＣＰＵ
１５ｂ ＲＯＭ
１５ｃ ＲＡＭ
１６ 操作ボタン
１７ 表示部
１７ａ 表示器
１７ｂ 表示器
１７ｃ 表示器
１８ プリンタ
Ｓ 試料 DESCRIPTION OF SYMBOLS 1 Balance main body 1A Balance main body 2 Water tank 3 Drive part 4 Base 5 Stand 11 Load sensor 12 Amplifier 13 A / D converter 14 Input / output interface 15 Processing unit 15a CPU
15b ROM
15c RAM
16 Operation buttons 17 Display unit 17a Display unit 17b Display unit 17c Display unit 18 Printer S Sample

Claims (2)

液浸法による比重測定を行う手段を有する電子天びんにおいて、比重測定を行う固体試料の空気中及び液中の重量計量値およびその液体比重値から算出される固体試料の比重値あるいは、沈錘の空気中及び液中の重量計量値、及び沈錘体積から算出される液体試料の比重値の有効桁数を判定する有効桁数判定手段を備え、その有効桁数に対応した試料の比重値を表示することを特徴とする電子天びん。 In an electronic balance having means for measuring the specific gravity by the immersion method, the specific gravity value of the solid sample or the weight of the solid sample calculated from the weight measurement value in the air and liquid of the solid sample to be measured and the liquid specific gravity value. Equipped with effective digit number judging means for judging the effective digit number of the specific gravity value of the liquid sample calculated from the weight measurement value in the air and liquid and the sink volume, and the specific gravity value of the sample corresponding to the effective digit number is provided. An electronic balance characterized by displaying. 前記有効桁数判定手段は固体試料の空気中の重量計量値の桁数もしくは空気中の重量計量値から液中の重量計量値を引き算した値の桁数のいずれか少ない方の桁数を比重値の有効桁数と判定し、沈錘の空気中の重量計量から液中の重量計量値を引き算した値の桁数を比重値の有効桁数と判定するものであることを特徴とする請求項１記載の電子天びん。 The effective digit number determining means uses the smaller number of digits, whichever is the lesser of the number of digits of the weight measurement value in air of the solid sample or the value of the weight measurement value in air subtracted from the weight measurement value in liquid. It is determined that the value is the effective number of digits, and the number of digits obtained by subtracting the weight measurement value in the liquid from the weight measurement in the air of the weight is determined as the effective number of specific gravity values. Item 1. An electronic balance according to item 1.
JP2005355345A 2005-12-08 2005-12-08 Electronic balance Expired - Fee Related JP4631686B2 (en)

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CN105181065A (en) * 2015-10-11 2015-12-23 西北农林科技大学 Volume weighing machine

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CN102854089B (en) * 2012-09-12 2016-05-25 广州市华南橡胶轮胎有限公司 A kind of detection method of shaped air holes rate

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JPH05302881A (en) * 1992-04-28 1993-11-16 Shimadzu Corp Measuring apparatus of specific gravity
JPH1038786A (en) * 1996-07-25 1998-02-13 U Mold:Kk Non-destructive inspecting method for light alloy casting
JPH1073525A (en) * 1996-08-30 1998-03-17 Shimadzu Corp Measuring apparatus for specific gravity
JPH1183711A (en) * 1997-09-03 1999-03-26 Japan Tobacco Inc Material tester
JP2004198314A (en) * 2002-12-19 2004-07-15 Shimadzu Corp Specific gravity measuring apparatus
JP2005062095A (en) * 2003-08-19 2005-03-10 Minolta Co Ltd Reflected light measuring device and reflected light measuring method

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Publication number Priority date Publication date Assignee Title
JPH05302881A (en) * 1992-04-28 1993-11-16 Shimadzu Corp Measuring apparatus of specific gravity
JPH1038786A (en) * 1996-07-25 1998-02-13 U Mold:Kk Non-destructive inspecting method for light alloy casting
JPH1073525A (en) * 1996-08-30 1998-03-17 Shimadzu Corp Measuring apparatus for specific gravity
JPH1183711A (en) * 1997-09-03 1999-03-26 Japan Tobacco Inc Material tester
JP2004198314A (en) * 2002-12-19 2004-07-15 Shimadzu Corp Specific gravity measuring apparatus
JP2005062095A (en) * 2003-08-19 2005-03-10 Minolta Co Ltd Reflected light measuring device and reflected light measuring method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105181065A (en) * 2015-10-11 2015-12-23 西北农林科技大学 Volume weighing machine

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