ML248xx, ML249xA MM PN: 13000-00164 Rev. K 2-1
Chapter 2 — Functional Description
2-1 Product Overview
The power meter is a lightweight, portable instrument featuring high accuracy and fast measurement speeds.
The large front panel LCD provides simultaneous dual display channel readout with graphical display of pulse
power measurements.
Sensor Inputs and Amplifiers
The ML2487x / ML2495A Power Meter features a single sensor input. The ML2488x / ML2496A Power Meters
have an additional sensor input. Each sensor input has its own dedicated, low noise, high speed amplifier. The
amplifier is split into five ranges to cover the power range from –70 dBm to +20 dBm. These are for CW
measurements only. Ranges 1 and 2 are the DC coupled ranges and are used for the measurements over a
dynamic range of approximately –30 dBm to +20 dBm. Ranges 3 to 5 are used for low level measurements.
These are the AC ranges and are used in conjunction with a chopper located in the sensor. The use of a chopped
signal provides extra measurement stability at low power levels.
There are also three high speed ranges which overlap each other. These are 7, 8 and 9 and are used for Pulse
Modulated measurements over a dynamic range of approximately –30 dBm to +20 dBm, depending on which
sensor is used.
Sensors
Two types of sensors are available: diode and thermal. Diode sensors provide fast response speed and a wide
dynamic range (–70 dBm to +20 dBm for example). Thermal sensors provide high accuracy and stable
averaged readings, with a dynamic range of –30 dBm to +20 dBm.
Internal Standard 50 MHz Reference (ML248xx only)
A high accuracy and stable 50 MHz reference is provided within the meter for convenient sensor calibration.
Option 15 Internal 50 MHz and 1 GHz Reference
A high accuracy and stable 50 MHz and 1 GHz reference is provided within the power meter for convenient
sensor calibration. The 1 GHz reference is essential for correct calibration of MA2411A Power Sensors. All
ML2495/6A power meters are fitted with the 50 MHz and 1 GHz reference. ML248xx power meters can have
option 15 installed.
Measurement Modes
The power meter has been designed to operate in two main modes.
Pulsed/Modulated Mode
Pulsed/modulated mode activates the high speed data acquisition system and is used to measure all time
variant signals such as GSM, CDMA, WLAN and radar signals. Results can either be displayed as a
graph (profile) or as a number (readout). A selection of trigger modes and controls allow the user to set
the precise time over which data is captured, measured and displayed in this mode.
CW Mode
CW mode activates the low bandwidth data acquisition system. This mode is used to measure CW and
slowly varying signals. Results are displayed as a readout display.
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