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1
Press the LIMIT hot key.
2
Press the PvsT 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
Slot power
Downlink pilot signal power
Uplink pilot signal power
Power between on and off
portions of the downlink slots
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 32 for more information.
Conducting modulation measurements
TD-SCDMA receivers rely on the frequency or phase quality of the QPSK or 8PSK signal in order to
achieve the expected carrier to noise performance. A transmitter with high frequency or phase error is
often still able to support phone calls during a functional test. It displays the frequency errors
numerically and graphically, showing the binary representation of the demodulated data bits of the
received signal using Constellation, Midamble Power, Code Power, and Code Error screens.
Constellation
The Constellation is used to observe some aspects of modulation accuracy and can reveal certain
fault mechanisms such as I/Q amplitude imbalance or quadrature imbalance. It displays constellation
diagram by modulation types.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 375, you
can continue your measurement. The measurement settings can be saved and recalled as a file. You
can also use JDViewer, PC application software to configure a measure setup, save as a file, and load
the file on to the instrument.
Procedure
1
Press the MEASURE SETUP hot key.
2
Toggle the Scramble soft key and select Auto or Manual to set the scramble code automatically
or manually.
3
Press the Slot Number soft key, and then select the time slot number to be displayed: TS0, TS1,
TS2, TS3, TS4, TS5, or TS6.
4
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
5
To set the number of maximum users, complete the following steps:
a
Press the Max Users soft key.
b
Enter a value up to 16 by using the numeric keys, and then press the Enter soft key.
Select
Slot Power
DwPTS Power
UpPTS Power
On/Off Ratio
JD700B Series User's Guide
Chapter 12 Using TD-SCDMA Signal Analyzer
Set
High Limit, Low Limit
High Limit, Low Limit
High Limit, Low Limit
High Limit, Low Limit
395
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