Frequently Asked EST Questions (FAQs)
Q. What does UUUU on the display mean?
Q. What are the measurement ranges for Hipot?
Q. Is the measurement compared to the high limit during ramp? Why is my test failing during ramp?
Q. Why is my unit showing GB Open? How do I turn it off?
Q. What is Start Wait?
Q. Does my QuadTech Hipot automatically discharge?
Q. What is Arc Detection?
Q. What is the difference between Ground Bond and Ground Continuity?
Q. Is there a way to prevent operators from changing the test program?
Q. What is lock recall?
Q. Is there any easy way for operators to access programs in memory?
Q. What does UUUU on the display mean?
A. The measurement range for the test has been exceeded. For IR this typically means the measured value is greater than 50Gohm. For Hipot it means the range or max current of the unit has been exceeded.
Q. What are the measurement ranges for Hipot?
A. For AC Hipot <3mA is the low range, ≥ 3mA to max current of unit is the high range. For DC Hipot <0.3mA is the low range, ≥ 0.3mA - <3mA is the mid range and ≥ 3mA to max current of the unit is the high range.
Q. Is the measurement compared to the high limit during ramp? Why is my test failing during ramp?
A. If RAMP JUDGMENT is set to ON, the high limit will be compared during ramp and the test will fail if the high limit is exceeded. If RAMP JUDGMENT is set to OFF, the high limit will not be compared during ramp. A ramp failure with RAMP JUDGMENT off is typically due to the leakage current exceeding the measurement range.
Q. Why is my unit showing GB Open? How do I turn it off?
A. This is a function of Start Wait. To disable GB Open, set Start Wait to OFF.
Q. What is Start Wait?
A. The Start Wait time is a delay time for Ground Bond – after a connection to the device is made and before current is applied to begin the ground bond test. This feature is beneficial for probing. For example: If a 2 second start wait time is programmed, once the Continuity between high and low GB connections is made, the unit waits the
2sec programmed start time then applies current to the DUT.
Q. Does my QuadTech Hipot automatically discharge?
A. Yes, the unit measures the voltage at the output and will keep the danger light on if voltage >50V is present.
Q. What is Arc Detection?
A. During Hipot, steady state current is monitored, if a high frequency component is found that persists for longer than a specified time, which may be as short as 10ms, the arc detection circuit interprets this as an arc. If the magnitude of the arc exceeds the limit set, the test will immediately alarm and terminate. Arc detection alarm differs from other failure alarms by beeping where other failures have a steady buzz.
Q. What is the difference between Ground Bond and Ground Continuity?
A. Ground Bond and Ground Continuity both apply a current and measure the resistance of the ground connection within a Device Under Test (DUT). The current used for Ground Bond is higher 1A – 40A, where as the current used for Ground Continuity is 100mA. Download QuadTech's Ground Bond vs. Ground Continuity: Why Choose One Test Over the Other application note to learn more.
Q. Is there a way to prevent operators from changing the test program?
A. Yes, all of QuadTech’s Hipot testers have a function called Key lock. When this is enabled the test programs cannot be modified. Keylock is password protected.
Q. What is lock recall?
A. Lock Recall is part of the key lock function. When set to Yes, the ability to recall memory locations is locked. When set to NO, the operator is able to recall different test programs in memory, however they will not have access to modify the programs.
Q. Is there any easy way for operators to access programs in memory?
A. Yes, enable keylock with lock recall set to NO. This will place the recall button on main testing page.
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