Electrical Test & Measurement · Electrical Safety Testers
Programmable high voltage withstand tester in an alternating and a direct version, with a regulated output, fifty linked program groups, arc detection and remote control.
7460 (2 models) ·
A high voltage test is a destructive test that is expected not to destroy anything, and the instrument earns its place by making the same test repeatable across a shift and across a production run. This pair is built for that single job at the top of the voltage range.
The pair covers the two ways a withstand test can be applied: one model produces an alternating output, the other a direct one. They share a body, a control layout and a memory structure, and neither carries the other function, so the choice is made by the test rather than by the budget.
The front panel is arranged for sequence entry. Test and reset buttons sit at the left, the display is centred above a block of function keys and a numeric keypad, and the high voltage terminals are at the right behind the warning marking. The rear carries the high voltage output, the mains inlet, the earth stud, two scanner connectors, remote signal connectors and a serial port.
The instrument raises its output from zero over a programmed rise time rather than switching it on at the set value. That matters for a capacitive item, where an instant step would draw a large charging current and trip a limit that the steady state would never reach.
Once the voltage is at the set value the instrument holds it for the test time and measures the current through the item. The current is compared with an upper limit, which is the breakdown criterion, and a lower limit, which catches an item that is not connected. A failure is reported by buzzer, by display and by lamp at the same time.
At the end of the test the output is removed and a discharge period is enforced before the item can be handled. The discharge time is part of the specification rather than an operating habit, which is the difference between a bench that is safe by design and one that is safe by discipline.
Arc detection watches for the fast transient that a local flashover produces. Its usable range narrows as the output voltage rises, because the transient sits on top of a larger signal and a detector set for the lower range would trip on the output itself.
The first question is the waveform. An alternating test is what most product standards for mains-powered equipment call for, and a direct test is used where the insulation is specified under a steady field, or where the capacitance of the item would draw too much current from an alternating output.
The second is the leakage limit. The two models differ in the units they work in as well as in the range, and the limit has to come from the standard rather than from the instrument’s maximum.
The third is the sequence. Where a product has to be taken through more than one voltage or held for more than one duration, the ability to link groups into a chain removes the operator from the middle of the test, and that is worth more on a production line than any single specification.
The fourth is the fixture. Two scanner connectors at the rear suggest a multi-point fixture; if the bench only ever tests one point, they will stay unused, and the cabling can be kept simple.
The instrument holds a voltage for a time and judges the current against limits. It does not ramp to breakdown and record the curve, so it can say that an item failed above a limit but not at what voltage it failed. Where the breakdown voltage is the result being sought, a different instrument is needed.
Leakage current includes the current through the fixture, the leads and any scanner in the path. On an item with very low leakage that residual can be a large part of the reading, so the lower limit has to be set with the fixture connected and characterised.
The two models are single-purpose. A bench that needs both an alternating and a direct test either runs two instruments or moves to a combined model elsewhere in the series, and that decision should be taken before the fixture is designed, because the two arrangements need different cabling.
Finally, the voltage class sets the clearance around the test area. At this level the leads, the probe spacing and the bench layout are part of the measurement, not accessories to it, and a test that passes on a well-laid-out bench can fail on a crowded one through leakage across the fixture alone.
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.
| Rated output | 10 kV AC at 10 mAStandard |
|---|---|
| Output voltage | 0.00 to 10.00 kV, resolution 0.01 kV, ±(2% of setting + 10 V)Standard |
| Output frequency | 50 or 60 Hz, selectableStandard |
| Waveform | Sine, total harmonic distortion below 2%, crest factor above 1.3 and below 1.5Standard |
| Regulation | ±(1.0% of reading + 10 V) from no load to full load, printed under the heading output resolutionStandard |
| Upper leakage limit | 0 to 10.0 mA, resolution 0.01 mA, ±(2.0% of setting + 2 counts)Standard |
| Lower leakage limit | 0.1 to 10.0 mA, resolution 0.01 mA, ±(2.0% of setting + 2 counts)Standard |
| Rise time | 0.1 to 999.9 s, resolution 0.1 sStandard |
| Test time | 0.2 to 999.9 s (0 = continuous), resolution 0.1 s; a second page gives 0.2 to 99.9 sStandard |
| Rated output | 10 kV DC at 5000 μAStandard |
|---|---|
| Output voltage | 0.00 to 10.00 kV, resolution 0.01 kV, ±(2.0% of setting + 10 V)Standard |
| Ripple | Below 5%, measured into a 12 kV / 5000 μA resistive load as printedStandard |
| Upper leakage limit | 0 to 5000 μA, resolution 1 μA, ±(2.0% of setting + 2 counts)Standard |
| Lower leakage limit | 0.1 to 5000 μA, resolution 1 μA, ±(2.0% of setting + 2 counts)Standard |
| Rise time | 0.1 to 999.9 s, resolution 0.1 sStandard |
| Test time | 0.2 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Arc detection | Ranges 1 to 9 below 7.00 kV; ranges 1 to 8 at or above 7.00 kVStandard |
|---|---|
| Discharge time | 200 ms or longerStandard |
| Program memory | 50 groups; groups can be linked so one test follows anotherStandard |
| Keyboard lock | Locked or unlocked modeStandard |
| Failure indication | Buzzer, display message and indicator lampStandard |
| Calibration | Software calibrationStandard |
| Remote input | Test and resetStandard |
|---|---|
| Remote output | Pass, fail and test in processStandard |
| Serial interface | RS232Standard |
| Scanner interface | Two D-type connectors marked scanner 1 and scanner 2Standard |
| Input supply | 115 or 230 V AC ±15%, single phase, selectableStandard |
|---|---|
| Input frequency | 47 to 63 HzStandard |
| Dimensions | 432 × 147 × 500 mmStandard |
| Weight | 24 kgStandard |
| Operating environment | 0 to 40 °C, 0 to 80% RHStandard |
| Standard accessory | Insulation test lead, listed for the 74 seriesStandard |
| Calibration certificate | Not stated in the materialInformation required |
| Ingress protection | Not stated in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| 7460 | Alternating withstand only | 0.00 to 10.00 kV AC at 10 mA | For the alternating test alone |
| 7462 | Direct withstand only | 0.00 to 10.00 kV DC at 5000 μA | For the direct test alone; the two functions are not combined in this pair |
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:
No. In this pair the alternating and direct tests are separate models, each with its own output and its own leakage ranges, and neither carries the other function. A bench that has to run both tests needs two instruments, or a different combined model from the same series, which is outside the material supplied here.
It runs stored groups one after another as a sequence, so a product that has to be tested at more than one voltage, or for more than one duration, does not need an operator to start each step. The sequence is built from groups that are already stored, which is why the group count matters more than the step count on this instrument.
Because the detector is measuring a transient on top of a large signal. As the output voltage rises the normal noise in the measurement rises with it, and the range that would trip on a real arc at a lower voltage would trip on the output itself at a higher one. The instrument therefore reduces the number of usable ranges above the threshold given in the material.
Whether the test is alternating or direct, which fixes the model; the leakage limit and test time the product standard requires; whether the steps have to run as a linked sequence or one at a time; and whether the bench will drive the instrument remotely, since that decides the cabling and the fixture.
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