Agilent Technologies S GSM, 8922M manual Power Ramp Mask Measurements, Power Ramp Measurements

Power Ramp Mask Measurements

Making Measurements

Measurements

These are:

•PHASE ERR - this displays the phase error graphically. The phase error trace is displayed using an autoscaling phase error axis versus data bits (numbered 0 through 147).

•DATA BITS - this screen allows you display a screen which details the values of the 148 bits in the timeslot (including midamble). If a known test signal is being used, the reception of these bits can be verified.

To avoid unwanted interference and to ensure successful reception at the Base Station, the mobile phone’s transmitted signal must conform to GSM standards. The purpose of the power ramp is to display the pulsed signal and verify that it conforms to these standards.

Method

Selecting PWR RAMP on the cell control screen gives you access to the power ramp measurement screens.

The marker (1), see Figure 2-8 on page 2-16 can be used to make a measurement at a discrete point in time along the signal trace. The amplitude at this point is displayed in the top left-hand corner of the screen.

2 1 3

Figure 2-8 Power Ramp Measurements

2-16