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A function to memorize the peak value over a certain period of time.
*Response time is selectable from approx. 10ms and 100ms.
Reading in the peak hold mode is the peak current value multiplies by 1/√2.
(When the input is sinusoidal, the reading is equal to the true RMS value.)
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| The value at a point where a waveform has the maximum amplitude. |
This diagnostic test recognises the fact that "good" insulation will show a gradually increasing of Insulation Resistance after the test voltage is applied. The Insulation Resistance is measured at two different times: normally at 1 min and 10 min (other time settings are possible). Then the instrument divides later reading by the earlier reading, obtaining the result so called the Polarization Index (PI). PI is dependent on the shape of insulation, influenced by moisture and it does not need to be temperature corrected.
| PI |
4.0 or more |
4.0~2.0 |
2.0~1.0 |
1.0 or less |
| Criteria |
Best |
Good |
Warning |
Bad |
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| The minimum increments in which a tester can take measurements. |
| Frequency at which an A/D converter circuit senses the quantity to measure: typically, twice or three times per second. |
The ability of a tester to respond to the quantity to measure, expressed as the ratio of a change induced in the reading to a change in the input:
| Sensitivity |
= |
| Change in reading |
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| Change in quantity to measure |
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