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
Содержание 83206A
Страница 24: ...Contents 24 RAND_U 242 1 of N 242 ...
Страница 29: ...Contents 29 Table of Contents Glossary 291 ...
Страница 30: ...Contents 30 Index 299 ...
Страница 146: ...146 S HP83206A USRGUIDE MANUAL meas fm Chapter 4 Making Measurements WER DTC or DCCH ...
Страница 168: ...168 S HP83206A USRGUIDE MANUAL prog fm Chapter 5 Programming the Cellular Adapter FACCH and SACCH programming ...
Страница 172: ...172 S HP83206A USRGUIDE MANUAL hpib fm Chapter 6 HP IB Syntax Diagrams DCCH DCCH ...
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Страница 194: ...194 S HP83206A USRGUIDE MANUAL hpib fm Chapter 6 HP IB Syntax Diagrams Meas ...
Страница 195: ...195 Chapter 6 HP IB Syntax Diagrams Meas HP IB Syntax Diagrams ...
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Страница 197: ...197 Chapter 6 HP IB Syntax Diagrams Meas HP IB Syntax Diagrams ...
Страница 199: ...199 Chapter 6 HP IB Syntax Diagrams Integer Number Setting Syntax HP IB Syntax Diagrams Integer Number Setting Syntax ...
Страница 203: ...203 Chapter 6 HP IB Syntax Diagrams Number Measurement Syntax HP IB Syntax Diagrams ...
Страница 264: ...264 S HP83206A USRGUIDE MANUAL trblesht fm Chapter 9 Troubleshooting Messages ...
Страница 284: ...284 S HP83206A USRGUIDE MANUAL is136bas fm Chapter 10 TIA EIA 136 Basics Basic Functions of the DCCH in TIA EIA 136 ...
Страница 290: ...290 S HP83206A USRGUIDE MANUAL adptinst fm Chapter 11 Installing the Cellular Adapter PCS Interface Connections ...
Страница 312: ...Index 312 ...