
NOTE: The START CAL key (number 3 on the keypad) does not start calibra-
tion when the unit is in Transmission Measurement mode.
Step 4.
Following the on-screen prompt, connect a phase-stable cable between the
RF
Out
port and the
RF In
port. If an attenuator is required for the measurement,
connect it directly to the
RF Out
port and connect the cable to the attenuator
output. The displayed trace before calibration should be similar to the one
shown in Figure 9-2.
Step 5.
Press the
ENTER
key.
The unit will sweep once and store transmission correction information. On the next sweep,
the trace should be flat at the zero dB reference line and ready for measurements. The cali-
bration information is lost when the instrument is turned off.
9-2
Chapter 9 Transmission Measurement
Figure 9-2.
Uncalibrated Narrowband Trace