Thawed Outside, Frozen in the Middle? NL-MWO-4 Heating Uniformity and Magnetron Output Bench (dishwasher test equipment)

Microwave complaints cluster on one phrase: thawed on the rim, frozen in the middle, one bite scalding and the next stone cold. The service answer — “it heats, so it is fine” — hides three root causes. Magnetron output drifts with the high-voltage transformer and capacitor, and decays silently with age. Cavity temperature distribution goes uneven the moment the stirrer or turntable misbehaves. And the low-power duty cycle distorts, so a nominal 30% defrost setting surges and stalls. A production line that warms one cup of water and passes the unit captures none of this: no wattage, no distribution map, no leakage record — until the household sends the machine back.

What the NL-MWO-4 uniformity and magnetron bench measures

• Four stations, output power by the IEC 60705 water-load method: a fixed 1 L load, temperature rise before and after heating converted to watts, logged per unit (the thermal-mapping branch of our dishwasher test equipment lab)
• Heating uniformity: grid temperature mapping inside the cavity, range and coefficient of variation auto-judged, cold and hot spots on one chart
• Low-power duty check: 30% and 50% settings, output character and duty period logged, defrost distortion exposed early
• Magnetron aging: output decay curve across hundreds of running hours, magnet and high-voltage degradation made visible
• Leakage survey: multi-point measurement at the door seam, window and waveguide port, automatic stop with the offending point recorded
• Interlock follow-up: after thousands of door actions, latch timing and leakage re-checked, safety items not waved through
• Mains adaptation: output logged from 198 V to 242 V, reproducing low-voltage apartment blocks
• Barcode and batch binding, power, uniformity and leakage data exported per unit for magnetron and oven lot comparison

Applicable standards

GB 4706.1 (household appliances – general safety), GB 4706.21 (microwave ovens – particular requirements), IEC 60705 (methods for measuring the performance of microwave ovens) and GB/T 2828 sampling; uniformity criteria and leakage limits can follow the customer’s standard.

Stations and throughput

Four stations running continuously replace “one warm cup, pass it” with per-unit wattage, temperature maps and leakage records in one pass — so incoming magnetrons and end-of-line ovens are sampled batch by batch, keeping half-thawed and uneven-heating complaints out of the field.

Manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd. — a non-standard testing equipment manufacturer of heating-uniformity and magnetron output benches, dishwasher test equipment, washing machine test equipment, pump test bench and pump performance test systems and level sensor life test machines.

Keywords: pump test bench, pump performance test, level sensor life test, dishwasher test equipment, washing machine test equipment.