Agilent Technologies 8935 series e6380a Estimating Swept Insertion Loss Using a Single Connection

Overview of the Test Set’s Built-In Tools

Using the RF Tools Program

9.The trace of the cable loss over the frequency range swept is displayed. The average loss is also displayed on the screen. To save the plot to a PC card, press k4 (Save Plot) and use the knob to enter a filename. Press k5 (Scr Dump) to send the image to a printer or to the BTS Laptop Utility. Directions will appear at the top of the screen. Press PRINT and allow the image to print to the connected device. Then, press PAUSE/CONTINUE. Press k1 (Proceed) when you are ready to proceed

10.The swept insertion loss results screen appears with the test results. If the BTS Laptop Utility is in use, this data is collected by the laptop. If you wish to repeat the test using the same calibrated devices and test parameters, press k1 (Repeat). To redisplay the plot screen, press k3(Disp Plot). To return to the Select Test (Main) Menu, press k5 (Return).

Estimating Swept Insertion Loss Using a Single Connection

Rather than directly measuring the transmitted signal (requiring connections at both ends), a known high-quality short can be put at the end of the cable. Knowing that this will reflect 100% of the signal, the Swept Return Loss test (page 92) can be used and the measured return loss in dB can simply be divided by 2 to get the system’s estimated insertion loss. If the return loss is not in dB, the square root of the measurement would be the system’s insertion loss. An open can also be used instead of a short, but the results will not be as precise.

Specifications

•Frequency Range: 0.4-1000 MHz, 1.7-2.0 GHz

•Swept Signal Level: -54 dBm to +10 dBm

•Insertion Loss Accuracy: +/- 0.75 dBm

Chapter 4 91