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Chapter 12
Using TD-SCDMA Signal Analyzer
442
JD700B Series User’s Guide
Setting limit for RF tests
By default, test limits specified in the standard are set for you. You can change thresholds if you desire.
Procedure
1
Press the
LIMIT
hot key.
2
Press the
RF Test Limits
soft key.
3
Select the test item(s) and set the limit(s) depending on your selected measurement mode:
To set the limit for
Select
Set
Channel power
Channel Power
High Limit, Low Limit
Occupied bandwidth
Occupied BW
High Limit
Spectrum emission mask
Spectrum Emission Mask
(On/Off only)
ACLR
ACLR
(On/Off only)
Multi-ACLR
Multi-ACLR
(On/Off only)
Spurious emissions
Spurious Emissions
(On/Off only)
4
Optional
. You can enable alarm sound that goes off if the measurement falls outside of the limit.
Toggle the
Beep
soft key between
On
and
Off
to enable or disable the beep sound.
5
Optional
. Go to
SAVE/LOAD > Save
, and then select
Limit
to save the limit settings.
See “Using save” on page 35 for more information.
Conducting power vs. time measurements
The Power vs. Time (P vs T) measurement analyzes the amplitude profile and timing of the burst signal and
provides a time mask for the signal. It measures the mean transmit power during the “useful part” of TD-
SCDMA bursts and verifies that the power ramp fits within the defined mask. TD-SCDMA is a Time Division
Multiple Access (TDMA) scheme with seven time slots, or bursts, per RF channel and by using the “Multi-
Slot” function, up to seven slots in a frame can be viewed at one time.
Power vs. time (slot)
The Power vs. Time (Slot) in TD-SCDMA Signal Analyzer measures the modulation envelope in the time
domain, showing the signal rise and fall shape of TD-SCDMA signal.
Setting measure setup
After configuring test parameters as described in the “Configuring test parameters” on page 429, 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
Slot Number
soft key, and then select the time slot number to be displayed:
TS0
,
TS1
,
TS2
,
TS3
,
TS4
,
TS5
, or
TS6
.
3
Press the
Spread Factor
soft key, and then select the spread factor option:
DL Auto
for auto
detection of downlink,
UL Auto
for auto detection of uplink,
SF1
,
SF2
,
SF4
,
SF8
, or
SF16
4
To set the number of maximum users, complete the following steps:
Press the
Max Users
soft key.