The commands in this subsystem relate to device-specific parameters, not signal-oriented parameters.
[:SENSe]:APPLication:TST?
Description
Triggers an application self-test. This command returns a 1 if all the tests passed and a 0 if one or more of the tests failed. Use [:SENSe]:APPLication:TST:RESult? to retrieve the detailed results of the test.
Cmd Parameters:
NA
Query Parameters:
NA
Range
NA
Default Value
NA
Default Unit
NA
Example
To trigger a self-test:
:APPLication:TST?
Front Panel Access
Shift 8 (System), Application Self Test
[:SENSe]:APPLication:TST:RESult?
Description
Retrieves the detailed results from the application self-test. [:SENSe]:APPLication:TST? must be called before this command to get correct results.
The response begins with an ASCII header. The header specifies the number of following bytes. It appears in the format #AX, where A is the number of digits in X, and X is the number of bytes that follow the header. There are a total of 18 fields in the return string and they have the following format:
The first PASSED/FAILED field represents the overall test result. The second field represents whether the signal generator is functioning properly. Fields 3 through 13 show the PLL status at the following frequencies:
There are four PLLs that are tested on the signal generator and an integer from 0 to 15 is shown in each field. Each PLL represents one of the four bits in the integer number. Below is a description of the PLLs and the bits that they correspond to:
Bit 0: Sys PLL Bit 1: IQ PLL Bit 2: LO PLL Bit 3: VR PLL
A 1 in the bit means that the PLL is functioning properly and a 0 means there is something wrong with the PLL. For example, a value of 13 (1101) means that the IQ PLL has failed. Field fourteen describes whether the internal SINAD hardware test has passed or failed. The 3 floats following the PASSED/FAILED field are the SINAD level, SINAD frequency, and the SINAD peak to peak value.
Sets the receiver power offset. Please note that when Auto Rx Range is set to On, changing the offset value causes the Ref Level to change. For example, if the reference level is at 7.0 dBm and the Rx power offset is then set to 10 dB external gain, the value of the reference level is automatically adjusted down to -3.0 dBm.
If Auto Rx Range is Off, any adjustments to the offset is reflected in the vertical position of the spectrum trace. The reference level is not adjusted.
The Received Pwr value in the Summary Table is also affected by changing this value.
The query returns a value from -100 to 100. A negative sign means external gain and no sign means external loss.
Cmd Parameters:
<value>
Query Parameters:
NA
Range
100 dB Ext Loss to 100 dB Ext Gain
Default Value
0 dB
Default Unit
dB
Example
To set the external attenuation to 30 dB:
:CORRection:OFFSet 30
Front Panel Access
Amplitude, Rx Power Offset
[:SENSe]:DM:SQUelch <value> [:SENSe]:DM:SQUelch?
Description
Sets the squelch power level. The squelch is only applied to the P25 Analyzer Summary window on the front panel and blanks out (--) all summary measurements except for Received Pwr when the received power level is lower than the squelch power setting. FETCh:SIGAnalyzer?, READ:SIGAnalyzer?, and MEASure:SIGAnalyzer? always returns all numerical values.
The query returns in the units (dBm, Watts, or Volts) selected through the Rx Units button using the front panel or with the command: UNIT:POWer:RX. If the Rx Units has been set to dBm, the squelch setting is returned in dBm. If the unit is set to Watts, the squelch setting is returned in fW. If the unit is set to Volts, the squelch setting is returned in fV.
The set command is sent using the units selected with the Rx Units button on the front panel or with the command: UNIT:POWer:RX. If the Rx Units has been set to dBm, the squelch setting must be set in dBm. If the unit is set to watts, the squelch setting must be set in fW. If the unit is set to Volts, the squelch setting must be set in fV.
Cmd Parameters
<value>
Query Parameters
NA
Range
0 dBm to -120 dBm or 1 fW to 1000000000000 fW or 223.6 mV to 223.61 nV
Default Value
-100 dBm or 100 fW or 2.24 μV
Default Unit
dBm or fW or fV
Example
To set the squelch to -10 dBm:
:DM:SQUelch -10
Front Panel Access
Setup, Squelch Lvl
[:SENSe]:DM:FORMat C4FM|CQPSk [:SENSe]:DM:FORMat?
Description
Sets the modulation type. Please note that setting the modulation type restarts the sweep.
Turns on frequency coupling. When frequency coupling is on, the Tx frequency cannot be set directly. The Rx Frequency and coupling offset must be used to set the desired Tx frequency. The Tx frequency automatically trails the Rx frequency by the frequency coupling offset every time the Rx frequency is set. Please note that turning on frequency coupling automatically moves the Tx frequency to the Rx frequency plus any frequency coupling offset. If the Rx frequency and frequency coupling offset are at settings where the Tx frequency is beyond the min/max limits, the instrument does not allow coupling to be turned on. The query command returns the state of the frequency coupling setting. A return value of 1 is ON, and a return value of 0 is OFF.
Sets the frequency coupling offset. If frequency coupling is on, the Tx frequency automatically trails the Rx frequency by this amount. Please note that the instrument prevents any coupling offset setting that makes the Tx frequency go beyond the min/max values. The query returns the current coupling offset in Hz.
Sets the span of the Spectrum display in P25 Analyzer measurement mode.
Note: Span value is set and returned in kHz.
Cmd Parameters
25|50|100|500|1000|5000
Query Parameters
NA
Range
25|50|100|500|1000|5000
Default Value
25
Default Unit
kHz
Example
To set the span to 1 MHz:
:SENSe:FREQuency:SPAN 1000
Front Panel Access
Frequency, Span
[:SENSe]:POWer[:RF]:RANGe[:IMMediate]
Description
Turns off auto ranging and adjusts the receiver reference level once. In P25 Analyzer measurement, this command adjusts the receiver reference level of the spectrum graph.
Turns auto range for the receiver on or off. When auto range is on, the reference level is automatically adjusted to the proper value to show the trace on the screen. If the auto ranging is turned off, the reference level does not adjust according to where the trace is. In P25 Analyzer measurement, this command adjusts the reference level of the spectrum graph.
Cmd Parameters:
OFF|ON|0|1
Query Parameters:
NA
Range
OFF|ON|0|1
Default Value
OFF or 0
Default Unit
NA
Example
To turn auto ranging off:
:POWer:RANGe:AUTO OFF
Front Panel Access
Amplitude, Auto Rx Range
[:SENSe]:SYMBolspan <value> [:SENSe]:SYMBolspan?
Description
Sets the symbol span. Please note that this setting only affects the Eye Diagram in the P25 Analyzer measurement. Please note that setting the symbol span restarts the sweep.