The test set can evaluate its own performance and make a determination as to the validity of a measurement result. The test set evaluates the conditions surrounding a measurement and reports to the user its evaluation of these conditions in a parameter called the measurement integrity indicator. A measurement integrity indicator value is returned for every completed measurement. It is recommended that the user take advantage of this feature in every measurement.
The returned value defines whether or not a problem was encountered by the measurement process. It is not, however, guaranteed to be the only or root cause of the measurement problem. This is because some of the conditions surrounding a measurement may interact, and the test set may have insufficient information to determine the root cause of the measurement problem. However, in most cases, the value returned is the most likely cause of the problem.
Over Range: Indicates that the input signal is over range. The amplitude of the device-under test's (DUT's) signal is causing the voltage at a DSP sampler to be above its maximum input level or the frequency is too high or the voltage measured is beyond the maximum voltmeter range, either positive or negative.
Trigger Early or Fall Early: Indicates that the DUT's burst amplitude fell prematurely or, due to an early trigger (early relative to a transmitted burst) the measurement sampling operation terminated before the falling edge of the burst.
Trigger Late or Rise Late: Indicates that either the rising edge of the DUT's burst was late or, due to a late trigger (late relative to a transmitted burst) the measurement sampling operation didn't start until after the rising edge of the transmitted burst.
Sync Not Found: For the GSM/GPRS/EGPRS power versus time measurement, indicates that the midamble was not found therefore the measurement was not synchronized. For the W-CDMA BER and BLER measurements, indicates that the test set has lost synchronization with the UE.
Oven Out of Range: Indicates that a temperature controlled oven (other than the internal timebase oven) is outside of its operating range. The power meter's oven is checked and its condition reported with this value. (The internal timebase generates a temporary error message (out of lock) that is sent to the system error queue and the display. This is not an integrity indicator value, it is an error message.)
Unidentified Error: Indicates errors which are not covered by the other integrity values. Examples include: parameter errors, algorithm memory errors (too many measurements), measurements unavailable (unable to control), autorange unable to converge, default calibration data used.
PCM Full Scale Warning: Indicates that the PCM signal has reached plus or minus full scale. The measurement made will be accurate on the PCM signal but would typically indicate an overdriven or oscillating element in the DUT.
Questionable Result for Phase 1 Mobile: Indicates that the user attempted to make an FBER measurement in a phase 1 system. FBER is only possible in a phase 2 GSM system. This indicator is available only when the selected broadcast band is PGSM.
|Potential Receiver Saturation: Indicates that an input signal immediately prior to the measured input was high enough to potentially saturate the receiver hardware.
Unsupported Configuration: Indicates that some parameter, other than a measurement setup parameter has been set so that it causes an invalid measurement result. Typically this would be a base station emulator parameter.
|Burst Not Found
|Missing Loopback Packets or AT Buffer Overflow: Indicates that Loopback Packets are missing, or the Access Terminal had an overflow. This integrity indicator was added for the 1xEV-DO Packet Error Rate measurement.
No AT Loopback Packets: Indicates that no Loopback Packets from the Access Terminal were detected for a period of several seconds. This integrity indicator was added to provide an early termination criteria for the 1xEV-DO Packet Error Rate measurement.
|Questionable MS-to-Cell Data: Indicates that a condition exists on the uplink or reverse channel that has caused the measurement results to be in question. In the case of the WCDMA Loopback BER measurement, an example condition that could cause this integrity indicator would be detection of a CRC error in an uplink transport block.
|Trigger Missed: Indicates one or more triggers were missed during the measurement. In the case of the CDMA TX dynamic power measurement, an example condition that may cause this integrity indicator would be GPIB or LAN activities occur during the measurement. This integrity indicator was added to prevent the CDMA TX dynamic power measurement from hanging forever and provide an early termination criteria for the measurement.
10 OUTPUT 714;"INITiate:DAPower" !Start Digital Average measurement 20 OUTPUT 714;"FETCH:DAPower?" !Request measurement results. 30 ENTER 714;Integrity,Tx_power !Read measurement results. 40 IF Integrity = 0 THEN !Permits measurement to be printed if integrity indicator 50 !indicates a successful measurement 60 PRINT "Analog TX Power =";Tx_power!if 0 then measurement was successful 70 ELSE 80 PRINT "Measurement integrity questionable, integrity value = ";Integrity !If 90 !integrity 100 !not zero 110 !then print 120 !integrity 130 !value. 140 END IF 150 END