Flashover Detection

Ground Fault Interrupt (GFI)

Open / Short Check (OSC)

OSC function check for Open (bad connection) or Short (DUT short circuited) occurring during test. If a DUT has an open circuit during test, the unit might be misjudged for a good one. If a DUT has a short circuit, OSC function can filter it out to diminish the damage to the fixture and save test costs.

In general, products under Hi-pot test have capacitance (CX). CX could be tens of pF to several μF under normal conditions. When the circuit connection is interrupted, a small capacitance will be formed on the broken interface, usually lower than 10pF. This makes the entire capacitance of the product lower than the normal value. The capacitance of a product may be higher than normal when the product is short-circuited or near short circuit. Thus the high/low limit of capacitance variation can be used to identify short circuit problems.

High Speed Contact Check (HSCC)

HSCC mode is a new measurement technology for contact checks. It scans the circuit contact with multiple test points in a very short period of time. With this new feature, contact checks can be performed quickly prior to the Hipot test.

DCR Measurement 2W/4W

Temp Compensation

Problems caused by temp differences will usually occur while measuring minor DCR values, when the temp difference and the measured resistance value will be different. With the Temp Compensation function that has been added to the 19035, the DCR is converted to the measured value under standard temp via temp coefficient conversion. Thus, the measured difference generated by temp differences will be reduced.

DCR Balance

Checking DCR balance of motor windings is just as important as checking inductance balance of the windings. When the EMF drive of different windings are not matched the rotational torque force will be unbalanced causing additional shaft wobble, vibration and bearing wear which affects long term life of the motor. The DCR Balance calculates the difference between the max and min DCR of the windings and compares that value to an acceptable programmable level, which in turn gives a PASS/FAIL output result for DCR balance. The DCR Balance Test is an auxiliary test tool for motors which helps establish long-term reliability of motors.

Contact Check

DCR tests not only measure the resistance of a winding, but also check the connections before the Hipot test. Chroma 19035 can perform DCR measurement on windings to check the external contact, and specifically for capacitance lower than 20pF between the test points in a wound component.

Motor/DC Fan Semi-Finished Products Electrical Testing

Motor, DC fan and other semi-finished products of electrical rotating machinery including stator and rotor require Hipot, DC resistance and layer short tests.

Sub-Step Function for Multi-UUT Testing

Parallel testing is often used as a solution for enhancing the efficiency of withstand voltage tests during production. However, if current high/low limit are not set correctly, defective products may be released, and good products may be misjudged as defective and sent to subsequent stations for unnecessary retesting.

In order to solve the parallel test problem and reduce the number of stations and cost, the 19035 provides a Sub-Step function. The fail condition can be set as a Sub-Step activation condition by editing the program sequence when parallel testing is required for production. This means taht the Sub-Step test will be conducted only when the main test item (parallel) failed and will determine which DUT is faulty. With the implementation of this function, the efficiency of withstand voltage test is improved significantly on the production line.

Example:
STEP 1: AC Hipot / pin1 to pin5, 6, 7
Sub step A: AC Hipot / pin1 to pin5
Sub step B: AC Hipot / pin1 to pin6
Sub step C: AC Hipot / pin1 to pin7

40-Channel Scan for Wound Component Hi-pot Testing

The new, optional A190359 16CH HV External Scanning Box provides 16 test channels. Each channel can be set as H (High Voltage Output), L (Return Low), or Off. With a 19035 and A190359 combination, the efficiency of wound component tests can be improved. With one 19035 and two A190359 units, up to 40 test channels are available. In addition, the contact check and tests of multi-pin components or products can all be done at once.

1. Power switch
2. Unknown test terminal
3. Stop key
4. Start key
5. LCD panel
6. Function keys
7. Test key
8. Main index key
9. System key
10. Cursor keys and enter key
11. Ground terminal
12. Interlock
13. RS232 interface (standard*1, option*1)
14. Line voltage selector
15. Ground terminal
16. AC line input
17. GPIB/HANDLER/TEMP interface (optional)
18. Scan Interface
19. Return/Low (for scanner)

20. HV output (for scanner)