HT 9464 Isolation Voltage Tester Operating and Service Manual
Note: this is a password-protected file. Contact for access.
Accurate and non-destructive production testing of ac Isolation Voltage and Partial Discharge.
With over 600 systems installed worldwide the 946X series of test systems are the standard and system of choice used by the majority of semiconductor manufacturers that produce optically isolated devices.
The HT 9460 and 9464 provide a practical and automatic solution for accurate production voltage isolation testing. The systems are designed specifically to test the input to output isolation of:
- Solid state relays
- Pulse transformers
- Photo Interrupters
- Isolation amplifiers
These systems assure that the devices shipped will meet the stringent specifications of UL and VDE-0083 for isolation testing as well as the VDE-0884 partial discharge specification.
Both the 9460 and 9464 systems are available in two basic models:
- Production testing (Fig. 1) with interface to automatic handlers
- Manual model (Fig. 2) for sample/lab testing.
Isolation Voltage and Partial Discharge Testing. The HT 9460 and HT 9464 test systems detect resistive and capacitive leakage. The HT 9464 also measures partial discharge and complies to the UL and VDE 0883 specifications up to 7 KVA (9.99 kV peak).
Partial Discharge Detection. Partial discharge activity indicates the presence of a physical insulation defect that can lead to high leakage and failures after the device is put into service. The HT 9464 is unique in its ability to detect partial discharge with a sensitivity of less than 5 pico-coulombs (pC) as specified In the VDE-0884 specification. An optional calibrator allows for 1 to 9 pico-coulomb repeatable calibration.
Non-Destructive Testing. Isolation voltage testing can often destroy a device due to the discharge of stored energy. The HT 9460 and HT 9464 produces negligible stored energy and features a current limiting design that prevents additional damage to failed devices. Voltages are applied to the DUT at the AC voltage crossings. If a failure is detected a solid-state switch removes the test voltage within 0.1 milliseconds. The HT 9464 adds the unique advantage of testing for partial discharge non-destructively.
Complete Operator Control. Front Panel control are provided to set test limits for device leakage, high voltage/low limit thresholds, and for the 9464 partial discharge. A digital panel meter displays actual device voltage as peak or AC, source voltage, or leakage current. The front panel also displays PASS/FAIL information.
Manual Configuration. Both the HT 9460 and HT 9464 are available in manual and auto handler models. The manual version is ideal for incoming inspection, sampling and laboratory analysis of devices or assemblies where high throughput is not a priority.
Auto Handler Configuration. For production applications the tester can be fully integrated with most automatic handlers. Handlers can be programmed to allow any output bin to be assigned to any sort class. Automatic re-test indicators are also included. Typical throughput is 2,000 to 2,400 units per hour with a one second specified test time.
Easy Safe Operation. The HT 9460 and HT 9464 series have been designed for simple test operation. Safety locks protect the operator from contact with the high-test voltages. Setting the desired test voltage is aided by a 3-1/2 digit display of the actual voltage. A transparent hinged cover prevents inadvertent operation of the adjustment knob.
This includes: High Voltage Test Head, Controller and Line Filter. The controller front panel is reversible to allow for either horizontal or vertical installation.
Shown above are the options available for the basic HT 9460 or HT 9464 auto handler configuration: 1. PDC 710V Partial Discharge Calibrator; 2. Opto-isolated handler or robotics interface; and 3. Verification Stand. The Verification Stand is used in conjunction with the High Voltage Test Head to calibrate/set-up the system off-line in a simulated environment without the handler interfaced. The opto-isolator is only required for handlers that do not have their own optically isolated buss. The PDC 710V injects a selected known charge (1 to 9 pC) into the Device Under Test (DUT) contacts. This calibration technique simulates an actual devices partial discharge, which allows all stray capacitances to be calibrated.