Tescom TC-3000C - Page 221

Appendix B. RF Test Cases of the TC-3000C
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requests until the LMP_max_power response would be received from the DUT. The time
delay between two consequential LMP_incr_power_req requests depends on the
Pow.SetTime parameter (to modify the value use: Menu  Configuration  DUT 
More3/5  Pow.SetTime, default value is equal to 1 second).
4. If the Test Mode parameter is equal to “Transmitter test” or “Loop back” then the DUT is
set to given channel TX frequency. The tester measures spectrum. The spectrum
analyzer settings are:
- Spectrum measurement method: FFT
- Center frequency: channel frequency
- Span: 2.5 MHz
- Resolution Bandwidth: 10 kHz
- Detector: Peak
- Mode: Maxhold
- Trigger: start of the RX packet
- Sweep time: duration of the RX packet
- Number of sweeps: defined by a user in the Number of sweeps test case parameter
5. Tester searches the highest power value in the transmit channel (peak of the emission).
6. Tester searches lowest frequency below the operating frequency, at which transmit power
drops 20 dB below the level measured in step 5. This frequency is called f_l and is
recorded in the test report.
Tester searches highest frequency above the operating frequencies, at which transmit
power drops 20 dB below the level measured in step 5. This frequency is called f_h and is
recorded in the test report.
7. The difference between the frequencies f_h-f_l measured in the former steps is the 20 dB
bandwidth and is recorded in the test report.
8. Tester repeats the steps 4 to 7 for each channel frequency (see the “BT channels”
parameter).
Test Results
f_l is the lowest frequency, measured in MHz, below the operating frequency, at which
transmit power drops 20 dB below the highest power value in the transmit channel.
f_h is the is the highest frequency, measured in MHz, below the operating frequency, at
which transmit power drops 20 dB below the highest power value in the transmit channel..
f_h-f_l is the 20 dB bandwidth for the transmit channel, measured in MHz.
To reach a verdict the test results is compared with the limit parameter:
“Upper Limit of 20 dB bandwidth”
To change the parameter, use the Edit menu of the test case. If the flag “Use Default” is
selected then all of displayed values of the parameters are ignored and the value according to
RF Test Specification [1] are assigned automatically.
Requirement to Initial Condition of a DUT
If the DUT can be controlled through HCI, the DUT must be connected to an appropriate HCI
port of the tester and correct value of the HCI Port parameter must be specified in DUT
configuration (Menu  Configuration  DUT  More1/5  HCIPort).
If the DUT does not have HCI then the DUT must be in the Inquiry Scan/Page Scan state
(maximum activity of the scan mode is desirable) and Test Mode should be enabled (for
Transmitter Test and Loop back Test Modes).