JD780A Series Analyzers
Using GSM/GPRS/EDGE Signal Analyzer
137
Conducting power vs. time measurements
The Power vs. Time measurement measures the mean transmission power during the useful part of
GSM bursts and verifies that the power ramp fits within the defined mask. It also lets you view the rise,
fall, and useful part of the GSM burst.
This measurement provides masks for both of Base Transceiver Station (BTS) and Mobile Station
(MS). The timing masks are referenced to the transition from the bit 13 to the bit 14 of the mid-amble
training sequence. For GMSK measurements, the 0 dB reference is determined by measuring the
mean transmitted power during the useful part of the burst.
Power vs. time (slot)
Setting measure setup
After configuring test parameters as described in the
“Configuring test parameters” on page 125, you
can continue your measurement. The measurement settings can be saved and recalled as a file.
Procedure
1.
Press the
MEASURE SETUP
hot key.
2.
Press the
Time Slot
soft key to assign a time slot with which performs measurements, and then
select your desired time slot number from
0
to
7
.
3.
Press the
Detect Mode
soft key, and then select the signal standard option:
Auto
,
GSM
, or
EDGE
. Auto is set by default. The instrument applies a mask automatically based on the selected
mode.
4.
Optional
. To set the delay, complete the following steps:
a.
Press the
Miscellaneous
soft key.
b.
Press the
Delay
soft key to set the amount of delay in µs.
c.
Enter a value by using the numeric keys. You can also use the rotary knob.
d.
Press the
µs
soft key.
NOTE
The Delay setting is used only when there is a time offset in the signals to be measured.
Setting limit for burst power
Procedure
1.
Press the
LIMIT
hot key.
2.
Press the
PvsT Test Limits
soft key.
3.
Press the
Burst Power
soft key to set the limit in the Power vs. Time (Slot) measurement.
4.
Toggle the
Test Limits
soft key between
On
and
Off
to enable or disable the Pass/Fail
indication.
5.
Set the upper threshold:
a.
Press the
High Limit
soft key.
b.
Enter a value for the upper limit, and then press the
dBm
unit soft key.
6.
Set the lower threshold:
a.
Press the
Low Limit
soft key.
Summary of Contents for CellAdvisor JD780A Series
Page 52: ...JD780A Series Analyzers 52 Getting Started Figure 6 Example of Web remote on Chrome...
Page 254: ...JD780A Series Analyzers 254 Using LTE FDD Signal Analyzer 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 323: ...JD780A Series Analyzers Using LTE TDD Signal Analyzer 323 3 RS SINR 4 S SS RSSI 5 P SS Power...
Page 390: ...JD780A Series Analyzers 390 Using EV DO Signal Analyzer 3 Pilot 4 MAC 64 5 MAC 128...
Page 525: ......
Page 590: ...JD780A Series Analyzers 590 Appendix Figure 306 Append keywords window...
