User's Manual

Manual Cable Calibration – continued
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP F-41
PRELIMINARY
Table F-24: Test Cable Set–up (using Advantest R3465) Calibration Procedure
n ActionStep
10 Verify that the Output CRT Menu Key highlighting is OFF.
S If it is highlighting OFF, proceed to Step 11.
S If it is not highlighting OFF:
– Press the Output Key to toggle it OFF.
– Proceed to Step 11.
11 Press the LEVEL Key in the ENTRY Area.
12 Set the LEVEL to 0 dBm using the Keypad Entry Keys.
13 Zero the Power Meter.
14 Connect the Power Sensor directly to the “RF OUT” Port on the R3561L CDMA Test Source Unit.
15 Press the Output CRT Menu Key to toggle Output to ON.
16 Record the Power Meter Reading ________________________
17
Disconnect the Power Meter Sensor from the R3561L RF OUT Jack.
* IMPORTANT
The Power Meter Sensor’s lower limit is –30dBm. Thus, only components having losses < 30 dB
should be measured using this method.
For best accuracy, always re–Zero the Power Meter before connecting the Power Sensor to
the component being calibrated.
– Then, after connecting the Power Sensor to the component, record the calibrated Loss
immediately.
18 Disconnect all components in the the Test Set–up in order to calibrate each one separately.
18a Connect each component one–at–a–time between the “RF OUT” Port and the Power Sensor.
– Refer to Figure F-24, “Set–ups A, B, and C”.
18b Record the calibrated Loss Value displayed on the Power Meter for each connection.
Example: (A) 1st Test Cable = –0.5 dB
(B) 2nd Test Cable = –1.4 dB
(C) 20dB Attenuator = –20.1 dB
(D) 30 dB Directional Coupler = –29.8 dB
19 Press the Output CRT Menu Key to toggle Output OFF.
20 Calculate the total Test Set–up loss by adding up all the individual losses:
Example: Total Test Set–up loss = 0.5 + 1.4 + 20.1 + 29.8 = 51.8 dB
This calculated value will be used in the next series of tests.
21 Press the FREQ Key in the ENTRY Area.
22 Using the Keypad Entry Keys, set the test frequency to the RX Frequency.
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