135
Chapter 4, Making Measurements
Power Measurements
Ma
king
Me
asu
re
me
nts
Zeroing the
Average Power
Meter
Before establishing a call, zero the average power meter by selecting the
Power
Meter
-
Zero
field on the DCCH CALL CONFIGURE screen. (See
“Zeroing the
Average Power Meter” on page 35
). Once zeroed, measurement accuracy is
typically
±
5% or 0.2dB.
Understanding the
Max Abs
Measurement
Max Abs
is a measure of the power into the analog to digital converter (ADC) at
the input of the Cellular Adapter. It is displayed as an aid to troubleshoot
measurement problems. If this level drops below
−
20dB, or goes above
−
1dB, the
level into the ADC is too low or too high and will cause inaccurate measurements.
Max Abs is affected by the transmitter’s power into the Test Set and by the
Pwr
Gain
setting. If you select
Pwr Gain - Auto
, then
Max Abs
will automatically
remain within the proper limits if the transmitted level is high enough (but not too
high).
Auto
is the recommended setting. If you select
Pwr Gain - Hold
, then
you must adjust the gain by selecting a setting from the
Choices
menu.
Max Abs
must remain between
−
1 and
−
20 dB.
Measuring Average
Power on an Active
Traffic Channel
1. Access the CALL CONTROL screen.
2. Establish a call between the mobile and the Test System on a digital traffic channel.
When established, the
Connect
indicator on the CALL CONTROL screen is ‘‘lit’’
and the
Traffic Chan Assignment
-
Type:
indicates DTC. See
“Registration” on page 93
.
3. Select
Meas
from the
Data/Meas
field.
4. Select
Avg Pwr
from the
Choices
menu.
5. The average power is displayed.
Figure 50
Average Power Measured on the CALL CONTROL Screen
Indicates the
type of traffic
channel being
received
Avg-pwr.tif
Summary of Contents for 83206A
Page 24: ...Contents 24 RAND_U 242 1 of N 242 ...
Page 29: ...Contents 29 Table of Contents Glossary 291 ...
Page 30: ...Contents 30 Index 299 ...
Page 146: ...146 S HP83206A USRGUIDE MANUAL meas fm Chapter 4 Making Measurements WER DTC or DCCH ...
Page 172: ...172 S HP83206A USRGUIDE MANUAL hpib fm Chapter 6 HP IB Syntax Diagrams DCCH DCCH ...
Page 173: ...173 Chapter 6 HP IB Syntax Diagrams DCCH HP IB Syntax Diagrams ...
Page 174: ...174 S HP83206A USRGUIDE MANUAL hpib fm Chapter 6 HP IB Syntax Diagrams DCCH ...
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Page 264: ...264 S HP83206A USRGUIDE MANUAL trblesht fm Chapter 9 Troubleshooting Messages ...
Page 312: ...Index 312 ...