Testing of the BT-6688B insulation tester by connecting a Fluke 23 votmeter at a test setting of 500 VDC on the BT-6688B. The test voltage seems to be 489 VDC. The resistance of the Fluke is displayed at ca 9,8 Mohm. All together acceptable values for such a low cost device. Did not do tests at higher voltages yet to not damage the Fluke.

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