T A K I N G M E A S U R E M E N T S
Measurement Procedure 5.7.1
This section outlines the procedure for making TRFL measurements with the measuring receiver utility.
1. With the BB60A/C device connected to the PC and application software running, select
Measuring Reciever from the Utilities file menu.
2. The measuring receiver will open and perform a 3-second calibration. Wait for this calibration to
finish and connect your unit under test(UUT).
3. Prepare your UUT by selecting the maximum output power and center frequency of the device.
Ensure the UUT output is a CW signal.
4. Prepare the BB60 software by entering the center frequency of the UUT and pressing Sync
which recalibrates the measuring receiver for the new center frequency.
Note: For correct operation, ensure the frequency entered is close to the output frequency of the
UUT.
After step 4 above, verify the RF Power and RF Frequency readouts are correct and ensure the Relative
Power readouts are stable and very close to zero. You are now ready to begin making stepped output
power measurements. Perform the following steps for each output power level step.
5. Decrease/step the output power level of the UUT at most 10 dB.
6. Record any relevant readouts.
7. If the measuring receiver suggests to recalibrate the device at a new power range, do so now.
Recalibration takes about 3 seconds and is necessary to make continued accurate measurments
to lower power levels.
8. Return to step 5.
If at any time you want to start the test over, you can do so by selecting a new center frequency or
selecting the Sync button and starting over at step 1.
Be careful of IF overload messages which warn you that your UUT output power is too large for the
current power range. Avoid this by either decreasing your UUT power or pressing the Sync button to
return the measuring receiver utility to the highest power range.
As you decrease the output power of the UUT, the measuring receiver prompts you to enter new power
ranges. The ranges are finite and a warning will be issued if you have stepped over a range. To resolve
this increase your UUT output power slowly until you can enter the next lower power range.
Tips for Better Measurements 5.8
The BB60A and BB60C have internal gain and attenuation settings that are automatically adjusted for
your selected reference level. While the software allows the user to manually control these settings, the
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