User's Manual Part 3

Power Delta Calibration – continued
DRAFT
SC4812ET BTS Optimization/ATP — CDMA LMF
Apr 2001
G-8
Table G-3: HP8935 Power Delta Calibration Procedure
Step Action
8 Set the measuring HP8935 as follows:
– Measure mode to CDMA Anl
– Frequency to the CDMA calibration target frequency
– Input Attenuation to 0 dB
– Input port to RF–IN
– Gain to Auto
– Anl Dir to Fwd
9 Turn on the source HP8935 signal output.
10 Set the Chn Pwr Cal to Calibrate and select to calibrate.
11 Measure and record the channel power reading on the measuring HP8935 as result
B ________________________.
12 Turn off the source HP8935 signal output and disconnect the equipment.
13 Calculate the Power Calibration Delta value. The delta value is the power meter measurement minus
the Advantest measurement.
Delta = A – B
Example: Delta = –0.70 dBm – (–1.25 dBm) = 0.55 dBm
Example: Delta = 0.26 dBm – 0.55 dBm = –0.29 dBm
These examples are included to show the mathematics and do not represent actual readings.
NOTE
Add this delta value to the TX Cable Loss value during In–Service Calibration (see Step 4 in
Table G-4).
Figure G-5: Delta Calibration Setup – HP8935 to HP437B
Power
Sensor
Hewlett–Packard Model HP 8935
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DUPLEX OUT
Short RF Cable
HP437B
SENSOR
FW00805
G