User's Manual

Test Equipment Setup – continued
SC 4812T CDMA BTS Optimization/ATP
May 2000
F-4
Table F-2: Manual Cable Calibration Test Equipment Setup (using the HP PCS Interface)
Step Action
8 Set RF Generator level:
– Position the cursor at RF Generator Level and select it.
– Enter –10 using the numeric keypad; press [Enter] and the screen will go blank.
– When the screen reappears, the value –10 dBm will be displayed on the RF Generator Level line.
9 Set the user fixed Attenuation Setting to 0 dBm:
– Position cursor at Analyzer Attenuation and select it
– Position cursor at User Fixed Atten Settings and select it.
– Enter 0 (zero) using the numeric keypad and press [Enter].
10 Select Back to Previous Menu.
11 Record the HP83236 Generator Frequency Level:
Record the HP83236B Generator Frequency Level:
– Position cursor at Show Frequency and Level Details and select it.
– Under HP83236 Frequencies and Levels, record the Generator Level.
– Under HP83236B Frequencies and Levels, record the Generator Frequency Level
(1850 – 1910 MHz for 1.9 GHz or 1750 – 1780 for 1.7 GHz).
– Position cursor at Prev Menu and select it.
12 Click on Pause for Manual Measurement.
13 Connect the power sensor directly to the RF OUT ONLY port of the PCS Interface.
14 On the HP8921A, under To Screen, select CDMA GEN.
15 Move the cursor to the Amplitude field and click on the Amplitude value.
16 Increase the Amplitude value until the power meter reads 0 dBm ±0.2 dB.
NOTE
The Amplitude value can be increased coarsely until 0 dBM is reached; then fine tune the amplitude
by adjusting the Increment Set to 0.1 dBm and targeting in on 0 dBm.
17 Disconnect the power sensor from the RF OUT ONLY port of the PCS Interface.
* IMPORTANT
The Power Meter sensor’s lower limit is –30 dBm. Thus, only components having losses ≤30 dB
should be measured using this method. For further accuracy, always re-zero the power meter
before connecting the power sensor to the component being calibrated. After connecting the
power sensor to the component, record the calibrated loss immediately.
18 Disconnect all components in the test setup and calibrate each one separately by connecting each
component, one-at-a-time, between the RF OUT ONLY PORT and the power sensor (see Figure F-1,
Setups A, B, or C). Record the calibrated loss value displayed on the power meter.
 Example: (A) Test Cable(s) = –1.4 dB
(B) 20 dB Attenuator = –20.1 dB
(B) Directional Coupler = –29.8 dB
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