Ceyear 87230 Series, Quick Start Manual

Page: 21 / 27

3 Typical Applications
3.3 Zeroing and Calibration Before Measurement
14
Fig. 3.3 Equipment Connection Window
Step 5. The settings including unit selection, offset and relative measurement can be carried out in the
“
Measurement” label window;
Step 6. Click and buttons of the toolbar to create the value display window and
analog display window;
Step 7. Click button of the toolbar to research and connect the new USB power sensor.
3.3 Zeroing and Calibration Before Measurement
In order to improve the measurement accuracy of the 87230 series USB CW power sensor, it is
necessary to zero it before small signal power measurement.
The 87230 series USB CW power sensor has been calibrated before delivery with the calibration source
traceable to the national standard, and thus calibration is not recommended to the users.
3.3.1 Zeroing
Zeroing refers to measurement and storage of noise of the whole measurement channel. In the process
of measurement, the zeroed value shall be deducted from the actually measured value, namely
deducting the channel noise, and this reading is the real channel input signal level.
If the sensor is connected to other equipment, firstly disable the signal output of the equipment, and then
zero it.
The specific steps are as follows:
Step 1. Connect the sensor to the output port of the source to be tested, and disable the output of the
source;
Step 2. Carry out external zero with the SCPI or [Zero] button on the power test panel. The green LED
lamp will flash during zero.
It is recommended to zero the 87230 series USB CW power sensor in following conditions:

When the temperature change is larger than 5
℃
;

After 24 h;

Before measuring the low power continuous wave signal. For example, when measuring the small