Chapter 2 — Functional Description 2-6 Internal Construction
ML248xx, ML249xA MM PN: 13000-00164 Rev. K 2-3
Front Panel
The front panel assembly is made up of a conductive contact rubber keypad sandwiched between the molded
plastic front panel and the LCD PCB assembly. Depending upon the option configuration selected, the front
panel may contain the signal channel input connectors and the RF calibrator reference output.
Rear Panel
The rear panel is made from sheet aluminum and contains the ground stud, line power input module, RS-232
I/O connector, GPIB connector, four BNC I/O connectors. The rear panel is attached to the main PCB and fits
into slots in the top and bottom cases.
Handle and Rack Mount
An optional handle can be fitted using the two circular mounting points on each side of the unit. A special top
and bottom case are available to provide rack mounting capability.
2-6 Internal Construction
The power meter contains the Measurement PCB, the Control PCB, and the Power Supply Unit (PSU).
Measurement PCB
The Measurement PCB is a multi-layer board with approximately 95 % surface mount components and with
some components through-hole mounted.
Control PCB
The Control PCB is a multi-layer board with approximately 95 % surface mount components and with some
components through-hole mounted. The board is mounted on six standoffs in the bottom case and secured by
three screws.
Power Supply
The power supply unit is mounted under the control PCB using a metal support bracket. The PSU sits in a
plastic cage to divert airflow to keep it cool. Line power is fed through an input filter module mounted on the
rear panel.
2-7 Front Panel
The front panel consists of the following components:
LCD Display
The large front panel color liquid crystal display presents measurements and operations menus.
System Keys
The operation of the power meter is controlled by six hard keys: Ch1/Ch2, Channel, Sensor, Cal/Zero, System,
and Preset. Each of these keys generates a soft key menu on the right side of the display.
Soft Keys
The six soft keys either apply functions directly, or access second or third level menus. Each key is related to
the text displayed directly to the left.
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