Electrical Test & Measurement · Electrical Safety Testers
Combined safety compliance tester running withstand, insulation, ground bond, leakage and no-load power tests in one sequence, with 100 programs of eight steps.
LK9661D (3 models) ·
A safety compliance sequence is five or six measurements of the same product, and the cost of running them on separate instruments is not the equipment but the handling between them. This range puts the whole sequence in one box, in one program, on one connection.
Three models share a 435 mm wide, 15 kg body and a 5.7 inch blue LCD. LK9661 and LK9661U run five tests: alternating withstand, insulation resistance, ground bond, leakage current and no-load power. LK9661D adds a direct withstand test, which is what makes it the six-function model.
The differences beyond that are small: LK9661U adds a USB port to the RS232 fitted to the other two. All three hold a hundred programs of eight steps, each named after the product it tests, so a line with many models can switch over without re-entering parameters.
The instrument runs the tests in the order written into the program. The alternating withstand test ramps to as much as 5 kV and compares the current with an upper and a lower limit; the direct test, where fitted, does the same at up to 6 kV.
The insulation test applies 500 or 1000 V DC and reads the resistance after the charging current has decayed. The ground bond test drives up to 30 A through the protective conductor and reads the milliohms across it, judging the result either as a resistance or as a voltage drop depending on how the standard is written.
The leakage test energises the product at 1.06 times its rated voltage and measures the current returning through a human body network, in either a dynamic or a static condition. The power test then runs the product at its rated voltage and measures the active power it draws with no load.
A digital closed-loop controller corrects the output against mains fluctuation throughout, which is what keeps the applied voltage at the programmed value when the bench shares a supply with other equipment.
The first question is whether a direct withstand test is needed. If it is, LK9661D is the only choice; if the product is tested only with alternating voltage, the other two do the same work for less.
The second is the interface. LK9661U adds USB to the RS232 that all three carry, which matters if results are exported to a memory stick rather than streamed to a computer. The PLC and alarm lamp connectors are on all three.
The third is the leakage network. Three human body networks are offered as an option and others can be made to order, so the standard the product is tested against decides what has to be specified at the order rather than at commissioning.
The fourth is the program count. A hundred programs of eight steps is a large number, and a line that runs a handful of products will not use it; a line that runs many will find it the difference between a changeover that takes seconds and one that takes a shift.
Every test shares one set of leads and one fixture, so a fault in the fixture affects all five or six results. The fixture has to be characterised before the limits are set, particularly for the ground bond and leakage tests, where lead resistance and stray capacitance are a large fraction of the reading.
The ground bond upper limit changes with the test current: 600 mΩ is allowed at 5 to 10 A, 300 mΩ at 11 to 25 A and 200 mΩ at 26 to 30 A. A program written for one current will not be valid at another, and the limit has to move with the current step.
The leakage and power tests run at multiples of the rated voltage, so the rated voltage has to be entered correctly. A product rated at 230 V tested at a 220 V setting is not tested to its standard, and the error is invisible in the result.
Finally, a combined instrument reports each test but does not interpret the combination. Whether a product passes is decided by the standard it is built to, and the instrument only supplies the numbers the standard asks for.
Every value below is taken from source documentation. Where a parameter is not stated in the available material it is marked as information required rather than estimated.
| Output voltage | 200 to 5000 V AC, ±(3% of setting + 5 counts)Standard |
|---|---|
| Breakdown current range | 0.10 to 25.00 mA, ±(3% of reading + 5 counts)Standard |
| Current limits | Upper 0.10 to 25.00 mA; lower 0.00 to 5.00 mAStandard |
| Test time | 1 to 300 s, in 1 s stepsStandard |
| Rise and fall | Voltage ramp up and ramp down settableStandard |
| Arc detection | Optional, nine levels, level nine the most sensitiveOptional |
| Voltage | 0.3 to 6 kV, printed as AC in the material although the group is headed direct withstandInformation required |
|---|---|
| Leakage current | 0 to 10 mAStandard |
| Availability | LK9661D only; LK9661U and LK9661 have no direct withstand testStandard |
| Test voltage | 500 or 1000 V DC, ±(3% of reading + 5 counts)Standard |
|---|---|
| Range | 1 to 2000 MΩStandard |
| Accuracy up to 100 MΩ | ±(5% of reading + 3 counts)Standard |
| Accuracy above 100 MΩ | ±(8% of reading + 8 counts)Standard |
| Alarm limits | Upper 0 to 2000 MΩ; lower 1 to 2000 MΩStandard |
| Test time | 1 to 300 s, in 1 s stepsStandard |
| Test current | 5.0 to 30.0 A AC, ±(3% of setting + 5 counts)Standard |
|---|---|
| Resistance range | 10.0 to 600 mΩ, ±(3% of reading + 5 counts)Standard |
| Upper limit by current | 10.0 to 600 mΩ over 5 to 10 A; 10.0 to 300 mΩ over 11 to 25 A; 10.0 to 200 mΩ over 26 to 30 AStandard |
| Lower limit | 0.0 to 100 mΩStandard |
| Judgement mode | By resistance or by voltage, selectable to suit different standardsStandard |
| Test time | 1 to 60 s, in 1 s stepsStandard |
| Output voltage | 1.06 times the rated voltage; 50 to 280 V AC, ±(0.5% of reading + 2 counts)Standard |
|---|---|
| Leakage range | 0.05 to 20.00 mA, ±(3% of reading + 10 µA)Standard |
| Leakage type | Dynamic or static, selectableStandard |
| Human body network | Three networks built in as an option, switchable; other networks made to orderOptional |
| Alarm limits | Upper 0.05 to 20.00 mA; lower 0.01 to 5.00 mAStandard |
| Test time | 1 to 300 s, in 1 s stepsStandard |
| Output voltage | 1.0 times the rated voltage; 50 to 280 V AC, ±(0.5% of reading + 2 counts)Standard |
|---|---|
| Output current | 0.20 to 30.00 A AC, ±(0.5% of reading + 2 counts)Standard |
| Active power | 30 to 6000 W, ±(0.5% of reading + 5 counts)Standard |
| Alarm limits | Upper 3 to 6000 W; lower 0 to 6000 WStandard |
| Test time | 1 to 300 s, in 1 s stepsStandard |
| Display | 5.7 inch blue background LCD, measured value and sorting result shown togetherStandard |
|---|---|
| Program memory | 100 programs of eight steps, each program named for its modelStandard |
| Control | Digital closed-loop feedback with automatic voltage regulation, so output is corrected against mains fluctuationStandard |
| Interfaces | RS232 on LK9661 and LK9661D; RS232 and USB on LK9661U; PLC, alarm lamp and expansion connectors on the rearStandard |
| Dimensions | 435 × 134.8 × 550 mmStandard |
| Weight | 15 kgStandard |
| Mains input | Not stated in the materialInformation required |
| Operating environment | Not stated in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| LK9661D | Six functions including direct withstand | AC 5 kV, 25 mA; DC 6 kV, 10 mA; ground 30 A; insulation 2000 MΩ; leakage 20 mA; power 6000 W | The only model with a direct withstand test |
| LK9661U | Five functions, RS232 and USB | AC 5 kV, 25 mA; ground 30 A; insulation 2000 MΩ; leakage 20 mA; power 6000 W | Adds a USB port to the five-function model |
| LK9661 | Five functions, RS232 | AC 5 kV, 25 mA; ground 30 A; insulation 2000 MΩ; leakage 20 mA; power 6000 W | The base five-function model |
Certifications are only published once a certificate copy can be produced, so this section is deliberately empty rather than populated with assumed approvals. Tell us which approvals your application requires and we will confirm what is available for this instrument.
The following are required for a complete specification but are not stated in the documentation supplied to us. They are listed rather than estimated:
A direct withstand test, up to 6 kV with a 10 mA leakage range. The other two models run the alternating withstand, insulation, ground bond, leakage and power tests, which is five. The direct test is what a capacitor, a cable or a semiconductor junction needs, and it is the only difference between the three models.
Because standards differ. Some write a maximum resistance, which is a direct limit on the measured milliohms; others write a maximum voltage drop at the test current, which is the same physical quantity expressed differently. Offering both judgement modes means one instrument can be configured to the clause in force rather than to a fixed interpretation.
Whether a direct withstand test is required, which decides between LK9661D and the other two; the leakage networks the standard calls for; the number of programs the line needs; and whether the station records results over RS232, USB or PLC. The rated voltage and current of the product also have to be stated, since the leakage and power tests are run at multiples of them.
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