Cal/Zero Menu Front Panel Operation
5-38 PN: 10585-00001 Rev. P ML2437A/38A OM/PM
5-7 Cal/Zero Menu
The Cal/Zero menu establishes the 0.0 dBm reference calibration and zeroing of the sensors.
Refer to Chapter 5 for specific procedures.
Zero/Cal
This function zeros and then sets the 50 MHz, 0.0 dBm reference of the connected sensor. In
dual sensor systems with both sensors connected, sensor A or B must be selected.
Cal 0 dBm [CAL]
References the connected sensor to 0.0 dBm at 50 MHz. In dual sensor systems with both
sensors connected, sensor A or B must be selected.
Zero [ZERO]
Zeros the connected sensor. Zeroing a power sensor compensates for noise and thermal EMF
of the device under test. It is recommended prior to taking important power readings in the
bottom 20 dB of a power sensor’s dynamic range. In dual sensor systems with both sensors
connected, sensor A or B must be selected.
RF ON/OFF [RFCAL]
Turns the RF calibrator ON or OFF.
Ext V [VZERO]
Zeros the rear panel multi-purpose BNC connector used for Volts per GHz connection (Analog
Input). This will calibrate the units to read zero volts on this BNC. During this operation the
connector should either not be connected to anything, or should be connected to a 0 Volt
source.
The rear panel voltage can be viewed by selecting CHANNEL > INPUT > VOLTS, although
this does not have to be selected in order for the function to operate.
This calibration is non-volatile and does not normally need to be performed. In the case of
offsets being introduced by the user’s setup, it is possible to leave the BNC cable connected to
zero out system offsets, however the offset zero range is limited to approximately 100 mV.
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