10.2 Requirements
Equipment required for testing the appliance
Portable Appliance Tester (P.A.T.)
Digital Multi-Meter (D.M.M.)
Megger / similar 500 V d. c. resistance meter
Microwave detection / leakage meter
Temperature reader
Continuity meter
Door Spacer Kit
Microwave safe 600 ml glass beaker
Microwave safe 2 litre container
10.3 Testing selected components (casing mounted)
Technical Advisory Notice: PAT testing of Merrychef ovens
While testing with a Portable Appliance Tester (PAT) is not an automatic requirement for the Merrychef
Commercial Combination Microwave oven models, the following notice is to advise on this testing in
addition to the following instructions as deemed necessary.
If the customer requires PAT testing of our equipment we suggest this is limited to a) earth continuity and
b) insulation resistance (measured at ~ 500 V DC). All Merrychef Commercial Combination Microwave
Ovens are classified as CLASS 1 for the purpose of testing.
Should it still be deemed necessary by the customer to perform an Earth Leakage test, the following
advice should be adhered to. Note that not all PATs are capable of just measuring the leakage or allow
you to set a pass limit and therefore may not be appropriate for this test.
HIGH LEAKAGE CURRENT
Merrychef appliances are fitted with radio interference filters and inverter circuits which cause an
increase in leakage current. The PAT may indicate an erroneous fail condition depending on its internal
"pass"/"fail" settings. Please refer to the revised limits which apply to the specific Merrychef oven model.
Never touch the component under test while tests are being carried through.
Call a trained authorized service agent if the oven under test still fails in order to check all earth
connections and disconnect the radio interference filters before repeating the test if required.
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