Electrical Test & Measurement · Electrical Test Equipment
Programmable AC source from 350 VA to 10 kVA, with 45 to 400 Hz output, two voltage ranges, 2% distortion and RS-232 control for bench and line testing.
YP4035 (7 models) ·
A product designed for one country’s mains is often tested in another. That is the case for a programmable AC source: it is not there to supply power, it is there to supply a particular power, at the voltage and frequency the product expects to meet in service.
Seven capacities share one control layout and one front panel. The bench frames run from 350 VA to 3 kVA; the 5 kVA and 10 kVA units are cabinets with the same panel on a larger chassis. Voltage and frequency are set on the touchscreen, with a column of function keys beside it, a rotary knob for continuous adjustment and a universal socket at the right.
The screen shows voltage, current, power, power factor and frequency together. That grouping is deliberate: a product with a failing power factor shows it here, next to the watts, without a second meter and a second set of leads.
The rear carries the RS-232 socket as standard, an RS-485 socket when ordered, the cooling fan, a second output outlet and the mains inlet.
The incoming mains is rectified to a direct rail and inverted back to alternating current at the frequency set on the panel. The amplitude is set separately, so voltage and frequency move independently — which is what allows a 60 Hz product to be run at 50 Hz, or a 400 Hz avionics item to be run at all.
The output is filtered to a sine wave and fed back to the control loop, which corrects for changes in the load. Two voltage ranges are provided rather than one wide range, because a single range that reaches 300 V cannot resolve a 5 V adjustment finely; switching ranges keeps the resolution usable at the low end.
Current is limited and leakage is watched. If the leakage exceeds the set value the output is switched off, the buzzer sounds and the output lamp flashes. On a line where products are powered for the first time, that behaviour stops a fault from becoming a fire.
Start with the current at the test voltage, not with the wattage. A product rated at 500 W may draw 5 A at 100 V or 2 A at 240 V, and the source has to be chosen for the worse of the two cases. Motors and products with large input capacitors draw a surge well above their running current, and that surge decides the frame size more often than the steady figure.
Then the frequency band. A product for a 50 or 60 Hz market needs only the ends of the band; a 400 Hz item needs the top, and an aircraft or a machine tool may need both. The band is the same across the range, so this decides whether the instrument is suitable at all rather than which model.
Decide the frame from the environment as much as the load. A bench case fits under a shelf and can be moved; a 5 kVA or 10 kVA cabinet needs floor space, a three phase feed and a way to get it through the door.
Finally, decide how the source will be driven. Manual setting is fine for a repair bench; a test script needs RS-232 or RS-485, and that should be specified at the order. Send the voltage, the current including surge, the frequency range, the load type and the site supply.
The voltage ranges are fixed at the 150 V boundary. A product that needs 155 V is on the high range, where the resolution is coarser, and that is a consequence of the range split rather than of the instrument’s accuracy.
Distortion is quoted for the source, not for the combination of source and load. A load that draws a sharply peaked current will distort the voltage at its own terminals even when the source is behaving, and the longer the lead between them, the worse it gets.
The current and power readings are the source’s own measurements, taken at its output. They include the current drawn by the leads and any filter fitted between the source and the product, so a small load on a long lead can show a reading that is larger than the product’s own consumption.
Finally, an AC source is not a battery simulator and not a DC supply. It cannot reproduce the sag of a real supply during a surge, and it cannot hold a direct voltage. Where the test is about how a product behaves on a weak mains, a source with programmable output impedance is the instrument to look for, and this one is not that.
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.
| Capacity | 350 VA, 500 VA, 1 kVA, 2 kVA, 3 kVA, 5 kVA and 10 kVA by modelStandard |
|---|---|
| Low range | 1.0 to 150.0 V, continuously adjustableStandard |
| High range | 150.1 to 300.0 V, continuously adjustableStandard |
| Frequency | 45 to 400 Hz, 0.1 Hz per stepStandard |
| Shortcut keys | 50 Hz, 60 Hz and 400 Hz, selected from the panelStandard |
| Waveform | Sine waveStandard |
| Crest factor | 1.41 ±0.10 in the common table; 3:1 on the 350 VA sheetInformation required |
| Maximum current at 120 V | 4.2 A on 500 VA, 8.4 A on 1 kVA, 16.66 A on 2 kVA, 25 A on 3 kVA, 41.66 A on 5 kVA, 83.33 A on 10 kVAStandard |
| Maximum current at 240 V | 2.1 A on 500 VA, 4.2 A on 1 kVA, 8.3 A on 2 kVA, 12.5 A on 3 kVA, 20.83 A on 5 kVA, 41.66 A on 10 kVAStandard |
| Frequency stability | 0.1% or less in the common table; 0.01% or less on the 350 VA sheetInformation required |
|---|---|
| Voltage stability | 1% or lessStandard |
| Total harmonic distortion | 2% or lessStandard |
| Source effect | 1% or lessStandard |
| Load effect | 1% or lessStandard |
| Efficiency | 90% or more, and 80% or more at 3 kVA and belowStandard |
| Display | 5 in full touchscreen, with voltage and frequency shortcut indicators beside itStandard |
|---|---|
| Voltage display | 1% of reading plus 0.1% of range, resolution 0.1 VStandard |
| Current display | 1% of reading plus 0.1% of range, resolution 0.001 A or 0.1 AStandard |
| Power display | 1% of reading plus 0.1% of range, resolution 0.01 W or 0.1 kWStandard |
| Power factor display | ±0.1, resolution 0.01Standard |
| Frequency display | 0.1% of reading, resolution 0.1 HzStandard |
| Preset | Output voltage, output frequency and output current limitStandard |
| Leakage alarm | Output switched off with a buzzer and a flashing output lamp when leakage exceeds the set valueStandard |
| Input, 10 kVA and below | Single phase 220 V ±10%, 50 Hz ±5 HzStandard |
|---|---|
| Input, above 10 kVA | Three phase 380 V ±10%, three phase four wire plus earth, 50 Hz ±5 HzStandard |
| Case | Bench case with a 430 mm square footprint; 5 kVA and 10 kVA supplied as cabinetsStandard |
| Height | 155 mm in the dimension drawing; 168 mm including feet on the 1 kVA model cardInformation required |
| Weight | 18 kgStandard |
| Output socket | Universal socket on the front panel; a second outlet on the rearStandard |
| Supplied accessories | Not listed in the materialInformation required |
| Model | Configuration | Key ranges | Availability |
|---|---|---|---|
| YP4035 | 350 VA, bench case | 1.0 to 300.0 V in two ranges; 3 A low range, 1.5 A high range; 45 to 400 Hz | Smallest capacity |
| YP4050 | 500 VA, bench case | 1.0 to 300.0 V; 4.2 A at 120 V, 2.1 A at 240 V | Entry model for small products |
| YP4101 | 1 kVA, bench case | 1.0 to 300.0 V; 8.4 A at 120 V, 4.2 A at 240 V | Common bench size |
| YP4102 | 2 kVA, bench case | 1.0 to 300.0 V; 16.66 A at 120 V, 8.3 A at 240 V | For larger single loads |
| YP4103 | 3 kVA, bench case | 1.0 to 300.0 V; 25 A at 120 V, 12.5 A at 240 V | Largest bench case |
| YP4105 | 5 kVA, cabinet | 1.0 to 300.0 V; 41.66 A at 120 V, 20.83 A at 240 V | Cabinet frame |
| YP4110 | 10 kVA, cabinet | 0 to 300 V on the model card; 83.33 A at 120 V, 41.66 A at 240 V | Largest capacity, cabinet frame |
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:
Yes. The frequency is adjustable across the whole band with 50, 60 and 400 Hz available as shortcut keys, so a product built for one market can be run at the frequency of another. That is the point of the instrument for an exporter: the same unit stands in for the supply of the destination country rather than the supply in the workshop.
The amps, at the voltage the product will run at. A product that draws 6 A at 120 V needs a source whose low-range current rating exceeds 6 A, which puts it at the 1 kVA model rather than the 500 VA one, even though the wattage looks modest. A load with a poor power factor draws more current for the same wattage, so the current rating is the figure to compare.
The highest voltage and the highest current the test needs, the frequency range, whether the load is a resistive bench item or a motor with a starting surge, whether the source will be driven from a PC, and the mains supply available at the site, since the larger frames need a three phase feed.
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