METHOD OF DISPLAYING INSULATION RESISTANCE AND INSULATION RESISTANCE METER

PROBLEM TO BE SOLVED: To provide an insulation resistance meter capable of properly measuring and displaying insulation resistance of an object under measurement at appropriate timing.SOLUTION: A method of displaying insulation resistance includes; connecting an insulation resistance meter 1 between a first output terminal 21 and a ground terminal 23 of a solar power generation unit 10 (connection box 20); having current measurement means 6 take two or more measurements of current A1 that flows in a first-test-voltage-applied state, in which a first test voltage V1 is applied, to derive a current variation rate (ΔI/Δt); storing measurement data D8 acquired when the current variation rate becomes reference current variation rate data value D4 or less as previous measurement data D6; deriving resistance value from a test voltage difference value (V2-V1) and a test current difference value obtained by subtracting the current value of the previous measurement data D6 from current A1 that flows in a subsequent second-test-voltage-applied state, in which a second test voltage V2 is applied; and having display means 3 display an insulation resistance value obtained by subtracting a value of an overcurrent protection resistor 5 from the derived resistance, and elapsed time from the start of the measurement.SELECTED DRAWING: Figure 1 【課題】測定対象体の絶縁抵抗値を適切なタイミングで適正に計測して表示できる絶縁抵抗計を提供する。【解決手段】太陽光発電ユニット１０（接続箱２０）の第１出力端子２１と接地端子２３との間に絶縁抵抗計１を接続し、検査用第１電圧Ｖ１を印加した検査用第１電圧印加状態にて流れる電流Ａ１を電流測定手段６により２回以上測定して電流変化速度（ΔＩ／Δｔ）を求め、電流変化速度が基準電流変化速度データＤ４以下になったときの測定値データＤ８を前回測定データＤ６として記憶し、その後に検査用第２電圧Ｖ２を印加した検査用第２電圧印加状態にて流れる電流Ａ１から前回測定データＤ６の電流値を減算した検査用差電流値と検査用差電圧値（Ｖ２−Ｖ１）から抵抗値を求め、過電流保護抵抗５の値を差し引いた絶縁抵抗値と、計測開始からの経過時間を表示手段３に表示する。【選択図】図１