Fluke 335A with outer enclosure removed
Inner chassis after removal from outer enclosure. The white plastic buttons ensure that it is spaced away from the copper clad lining the inside of the cabinet, as the chassis may be as high as 1.1kV above ground potential when the instrument is operating. Note that the front ears of the chassis are sandwiched between pieces of FR-4 to isolate it from the front panel.
Fluke 335ADC Voltage StandardDifferential Voltmeter