Ease Convection Microwave Oven

Details

A convection microwave that bakes, grills and reheats, so a house that buys one oven does not need a second. It carries the same three checkable numbers as the solo and one more that only a convection oven has to answer for. The capacity is printed as an internal dimension: the 25 L is 330 x 330 x 230 mm, which multiplies to 25.0 litres, and a reader who does the sum has caught anyone who inflated theirs. The microwave power is printed as output and input both, measured to IEC 60705, because an oven sold as 1400 W is quoting its draw and the output is nearer 900. The cavity is SS 304, uncoated, rather than the painted mild steel that flakes in a fan oven faster than in a solo because it is being taken to 200 C and back several times a week. And leakage is measured on every unit at 50 mm and must read below 1 mW per square centimetre against the 5 mW limit of IS 302-2-25. The extra number is the temperature. A fan oven's set point and its actual cavity temperature are not the same thing, and an oven that claims 250 C on a 1350 W element in a 25 L steel box is claiming something the element cannot hold. Ours goes to 200 C, measured at the cavity centre with a calibrated probe, and holds it to plus or minus 8 C once preheated, which is the honest tolerance rather than a round number.

• Internal cavity printed in millimetres per variant: 306 x 306 x 214 mm (20 L), 330 x 330 x 230 mm (25 L), 350 x 350 x 245 mm (30 L)
• Microwave output measured to IEC 60705 and printed beside the draw: 800 W from 1200 W on the 20 L, 900 W from 1350 W on the 25 L and the 30 L
• Convection 40 C to 200 C, measured at the cavity centre with a calibrated probe, holding plus or minus 8 C once preheated, and about 6 minutes to preheat to 180 C
• Grill on a 1100 W quartz element, replaceable on its own
• Draw on convection is 1250 W (20 L), 1400 W (25 L), 1500 W (30 L), so a 30 minute bake on the 25 L is 0.7 units, close to Rs 5.60 at Rs 8 a unit
• Cavity in SS 304, 0.6 mm, uncoated, which is what lets you wipe out a spilled bake instead of scrubbing paint off
• Leakage below 1 mW per square centimetre at 50 mm on 100 percent of units, with three door interlocks including a monitor switch that fuses the line if the other two operate out of sequence
• Standby measured at 0.4 W with the clock displayed and 0.2 W with the display off. It is not zero, because there is a board, and we are not going to claim otherwise for an oven that has a clock in it
• Manual power down to 100 W and a plain reheat that does not route you through a menu. The auto programmes are there and every one of them can be bypassed
• Turntable, roller ring, glass tray, grill rack, door latch, lamp, grill element, convection fan, door switches and the magnetron are all stocked as separate parts
• Combination mode alternates microwave and convection rather than running both at full power together, which is how the magnetron is kept inside its duty. The result is a faster bake, not a different physics
• A 25 L cavity is one cake tin or one tray of about eight cookies. It is a real oven and it is a small one, and no convection microwave at any capacity is a bakery deck
• It draws 1400 W on convection. On a shared 6 A point with a fridge and a kettle, something will trip