Electrical Test & Measurement · Electrical Safety Testers
Touch screen safety performance tester combining withstand, ground bond, insulation, leakage and electrical parameter measurement in one sequence, in three configurations.
YP9950 (3 models) ·
Appliance safety testing is a sequence, and the cost of a sequence is the handling between its steps. A tester that runs the whole sequence in one place is bought for the handling it removes, not for the number of functions on the brochure.
One body, one touch screen, three configurations. The base model runs the five tests that a general appliance line needs, the second adds a low-voltage start test, and the third adds a direct withstand test and a separate power channel. The sequence, the limits and the judgement are the same across all three.
The front panel is deliberately sparse: a start button, a stop button, the touch screen, a pair of test terminals and an output socket. Everything that would otherwise be a knob is a field on the screen, which is what allows the same panel to serve five different tests without a row of switches for each.
The instrument runs the selected tests one after another against the item that is connected. A withstand step raises an alternating voltage over a programmed ramp, holds it, and compares the leakage current with an upper and a lower limit. A bond step drives a heavy alternating current through the protective conductor and derives the resistance from the drop across it. An insulation step applies a direct voltage and reads the resistance after the charging current has settled.
The leakage step is different in kind, because the item is powered and running. The instrument measures the current that flows to earth through the enclosure or the protective conductor, in a static state or while the product is operating, and compares it with limits. The electrical parameter step measures voltage, current and power at the same terminals, so a product that passes its safety tests can be checked for consumption in the same pass.
Every step ends in a judgement rather than a number on a screen. A reading outside the limits stops the sequence and raises the alarm, which is what makes the instrument usable by an operator who is not reading the values.
Start with the product standard and list the tests it names. If the list is withstand, bond, insulation, leakage and consumption, the base configuration covers it. A requirement to prove that the product starts at reduced voltage moves the choice up one step, and a requirement for a direct withstand test or for a power channel that is independent of the leakage measurement moves it up again.
The second question is the source. Leakage and power tests need a supply that the tester does not contain, and the rated load of those tests is set by that external unit. The instrument should be specified together with the transformer or the variable frequency supply, not before it.
The third is the bond current. The usable resistance range narrows as the bond current rises, so a product with a high bond current and a generous resistance limit may need a different arrangement rather than a higher setting.
The fourth is how results leave the bench. Ports for PC software, remote control and an alarm lamp are all provided, and a line that records results per unit will use the first of them, while a line that only needs a lamp will use the last.
The instrument judges against limits; it does not characterise. Where the breakdown voltage or the insulation curve is the result being sought, a tester with a recorded ramp is the right instrument, and a pass or fail unit will only report that the limit was crossed.
The leakage and power figures depend on the source feeding the test. A different transformer, a different variable frequency supply or a different lead length changes the reading, which is why a result is only comparable with another result taken on the same arrangement.
Four-wire bonding removes the lead resistance from the measurement, but it does not remove the contact resistance at the probe. Probe placement and surface condition still dominate a reading at the bottom of the range, and the same jig has to be used if readings are to be compared over time.
Finally, the configuration is fixed at the order. The extra functions of the larger models are not field upgrades, so the product standard has to be read before the model is chosen rather than after the first failed audit.
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.
| Test type | Cold-state withstand testStandard |
|---|---|
| Rated load | 100 VA at 5000 V and 20 mAStandard |
| Output voltage | 300 to 5000 V, resolution 10 V, ±(2% of setting + 3 V)Standard |
| Output frequency | 50 or 60 Hz, selectableStandard |
| Regulation | Better than 2% from no load to full loadStandard |
| Breakdown current range | 0.100 to 20.00 mA, resolution 0.001 or 0.01 mA, ±(2% of reading + 0.03 mA)Standard |
| Breakdown current limits | Upper and lower 0.000 to 20.00 mA, where 0.000 switches the limit offStandard |
| Test time | 0.0 or 0.1 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Measurement method | Four-wireStandard |
|---|---|
| Open circuit output voltage | 12 VStandard |
| Output current | AC 3 to 32 A, continuously adjustable constant current, 1 A resolution, 50 or 60 HzStandard |
| Current accuracy | ±(2% of setting) over 3 to 32 AStandard |
| Resistance range | 0 to 600 mΩ from 3 to 10 A; 0 to 300 mΩ above 10 to 20 A; 0 to 200 mΩ above 20 to 32 AStandard |
| Resistance limits | Upper 0 to 600 mΩ; lower 0 to 600 mΩ, where 0 switches the limit offStandard |
| Resistance resolution | 1 mΩStandard |
| Resistance accuracy | ±(2% of reading + 3 mΩ)Standard |
| Lead zeroing | 0 to 200 mΩStandard |
| Test time | 0.0 or 0.1 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Rated load | 1 VA at 1000 V and 1 mAStandard |
|---|---|
| Output voltage | DC 200 to 1000 V, resolution 10 V, ±(2% of setting + 3 V)Standard |
| Output ripple | Below 5% into a resistive load at 1000 V and 1 mAStandard |
| Measurement range | 0.50 to 2000 MΩ, printed as 0.50 to 99.99, 999.9 and 2000 MΩ segmentsStandard |
| Limits | Upper 0 or 1 to 2000 MΩ, where 0 switches it off; lower 1 to 2000 MΩStandard |
| Resolution | 0.1 MΩStandard |
| Accuracy below 100 MΩ | ±(5% of reading + 0.5 MΩ)Standard |
| Accuracy from 101 to 2000 MΩ | ±(10% of reading + 5 MΩ)Standard |
| Resistance compensation | Above 30 MΩStandard |
| Leakage type | Static or dynamicStandard |
|---|---|
| Output voltage setting range | AC 0 to 300 VStandard |
| Output voltage measurement | AC 5 to 300 V, resolution 1 V, ±(2% of reading + 3 V)Standard |
| Leakage limits | Upper and lower 0.000 to 20 mA, where 0.000 switches the limit offStandard |
| Leakage resolution | 0.001 or 0.01 mAStandard |
| Leakage accuracy | ±(2% of reading + 0.03 mA)Standard |
| Rated load | Set by the external isolation transformer or variable frequency supply, not by the testerStandard |
| Test time | 0.0 or 0.5 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Voltage measurement | AC 5 to 300 V, resolution 1 V, ±(0.5% of reading + 0.5% of range)Standard |
|---|---|
| Current measurement | 0.050 to 25.00 A, resolution 0.001 or 0.01 A, ±(0.5% of reading + 0.5% of range)Standard |
| Power range | 5.0 to 6000 W, resolution 0.1 or 1 W, ±(0.5% of reading + 0.5% of range)Standard |
| Power limits | Upper and lower 0 to 6000 W, where 0 switches the limit offStandard |
| Power source | Set by the external isolation transformer or variable frequency supplyStandard |
| Test time | 0.0 or 0.5 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Voltage measurement | AC 5.0 to 300.0 V, resolution 1 V, ±(0.5% of reading + 0.5% of range)Standard |
|---|---|
| Current range | 0.050 to 25.00 A, resolution 0.001 or 0.01 A, ±(0.5% of reading + 0.5% of range)Standard |
| Current limits | Upper and lower 0.000 to 25.00 AStandard |
| Delay time | 0.2 to 999.9 sStandard |
| Test time | 0.0 or 0.5 to 999.9 s (0 = continuous), resolution 0.1 sStandard |
| Input supply | AC 220 V ±10%, 50 or 60 Hz ±5%Standard |
|---|---|
| Idle power | About 30 WStandard |
| Dimensions | 450 × 565 × 180 mm or 450 × 565 × 200 mm, excluding feet; the dimension drawing gives 450 × 565 × 200 mmStandard |
| Weight | About 20 kgStandard |
| Operating environment | 0 to 40 °C, 20 to 80% RHStandard |
| Standard accessory | Class II test probeStandard |
| Optional accessory | Three-colour alarm lamp, listed for all three modelsOptional |
| Calibration certificate | Not stated in the materialInformation required |
| Ingress protection | Not stated in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| YP9950 | Five functions | Withstand, ground bond, insulation, leakage and electrical parameters | The general-purpose configuration |
| YP9960 | Six functions | As YP9950 plus a low-voltage start test | For products that must be started at reduced voltage |
| YP9970 | Seven functions | AC and DC withstand, insulation, leakage, power, electrical parameters and low-voltage start | For a direct withstand test or a separate power channel |
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. Those functions take their load from an external isolation transformer or a variable frequency supply, and the rated load is decided by that unit rather than by the tester. The instrument measures the voltage, current and power at its terminals and applies the limits; the source has to be specified separately, which is why it belongs in the enquiry.
It checks that a product starts and runs at a reduced supply voltage, which is a requirement for some appliances and motor-driven products. It measures the voltage and current during the start and compares them with limits after a settable delay, so a product that draws too much current or fails to start is caught on the line rather than at the end user.
The five-function model covers withstand, ground bond, insulation, leakage and electrical parameters. The six-function model adds the low-voltage start test, and the seven-function model adds a direct withstand test and a separate power channel. Ask which of those three extra functions the product standard actually calls for; the rest of the specification is shared.
The functions the product standard requires, which fixes the configuration; the leakage and power source that will feed the test, since the tester does not include one; the ground bond current, because the resistance range narrows as that current rises; and whether the results have to be sent to a PC or only indicated on the line.
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