Anritsu ML2430A operation manual Measurement, Zeroing

Chapter 5 Procedures

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5-3

INTRODUCTION	This chapter presents some common procedures for use with the
	ML2430A Series Power Meter. These procedures refer to the ML2430A
	Series front and rear panel connectors and front panel keys and menus
	as explained in Chapter 3, Connections, and Chapter 4, Front Panel Op-
	eration. The operator should be familiar with the front and rear panel lay-
	outs and with the use of the keys and menus before
	attempting these procedures.
POWER	To perform a power measurement, follow these steps:
MEASUREMENT	￿ Connect the sensor(s) as described in Chapter 3, Connections.
	￿ Configure the meter for the application. Refer to Chapter 4, Front
	Panel Operation, for specific configuration options. The simplest op-
	eration is obtained with SENSORSETUPMODE set to DEFAULT.
	Power readings are continuous with the default setting.
	￿ Zero the sensor(s) as described in Section 5-3(optional).
	￿ Calibrate the sensor(s) as described in Section 5-4(optional).
	￿ Measure power.
ZEROING THE	Zero the sensor before making power measurements, particularly when
SENSOR	operating within the lower 20 dB dynamic range of the power sensor. If
	frequent low level measurements are being made, it is advisable to check
	the sensor zeroing often and repeat as necessary.
	To zero the sensor, connect it to the UUT (Unit Under Test) test port, and
	remove RF power from the connection to a level 20 dB below the tangen-
	tial noise floor of the power sensor. For –70 to +20dB dual-diode power
	sensors, this level is less than –100 dBm.
	It is preferable to leave the sensor connected to the UUT test port so that
	ground noise and thermal EMF are zeroed out of the measurement. Alter-
	nately, in order of preference, the sensor can be connected to:
	￿ A grounded connector on the UUT,
	￿ the ML2430A Series Calibrator connector,
	￿ disconnected from any signal source.
	When a new sensor is attached, the message SENSOR x NOT ZEROED
	(where x = A or B as appropriate) is displayed. If a sensor is removed and
	then reconnected, the message is not displayed.
	The sensor can either be zeroed, or zeroed and calibrated in the same
	operation.

ML2430A OM 5-1