GAUSS INSTRUMENTS TDEMI X3
The GAUSS INSTRUMENTS TDEMI X3 device driver is a Power Meter, Spectrum Analyser which is supported by RadiMation®.
Configuration[edit]
The following tabs are available in the advanced configuration of the GAUSS INSTRUMENTS TDEMI X3:
 Pre Wait Time
|
Wait time before starting the measurement-loop. Can be used to wait for a signal generator, and or amplifier to stabilize. |
| Measure
|
The minimum amount of measurements in the measure loop. Continues to loop even if power level is stable. |
| Wait Time
|
The wait time between each measurement is taken, during the measurement-loop. |
| Max. Difference
|
If the measured power between each measurement in the measurement-loop, is less than this value. The measured power is stable. The measurement-loop will then stop. |
| Max. Measure
|
The maximum amount of measure times, for the measurement-loop |
According to these settings, RadiMation® will perform a minimum of 3 power measurements with a wait time between the measurements of 75ms. If all those 3 measurements are within 0.1 dB, the power measurement is assumed to be stable, and RadiMation® will continue to average of the last 3 measurements. If the difference between the measurements is larger than the specified 0.1 dB, an additional power measurement will be performed, and the last 3 samples will be compared to the 0.1 dB difference again. At most 10 measurements will be performed if the difference between the 3 samples will not be within the specified 0.1 dB.
Both for the leveling, and the monitoring these settings can be set individually. The leveling is used, whenever RadiMation® is measuring the power, to regulate the signal generator. If the powermeter is only used as input, without regulating on it, then the monitoring settings are used.
More detailed information on how to achieve a fast and stable power measurement is available in Application Note 106: Powermeter parameter configuration.
The frequency range of the GAUSS INSTRUMENTS TDEMI X3 as provided by the manufacturer is shown and selected as default. It is possible to overrule these frequencies and to manual adjust the allowed frequency range of the GAUSS INSTRUMENTS TDEMI X3.
| Use default start frequency
|
If the checkbox is checked, the default start frequency will be used as the lowest usable frequency in a test for this device. |
| Custom start frequency
|
If the Use default start frequency checkbox is unchecked, another start frequency (expressed in MHz) can be specified. The customized start frequency will then be used as the lowest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default start frequency. |
| Use default stop frequency
|
If the checkbox is checked, the default stop frequency will be used as the highest usable frequency in a test for this device. |
| Custom stop frequency
|
If the Use default stop frequency checkbox is unchecked, another stop frequency (expressed in MHz) can be specified. The customized stop frequency will then be used as the highest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default stop frequency. |
Specifying a different frequency range can be useful if for example:
- A device (like a coupler, antenna, injection device, cable, etc...) is still useable (but out of specification) outside the standard suggested frequency range.
- An external mixer is used to measure an extended frequency range.
- An up- or down-convertor is used to shift the frequency range.
- A newer model of a device is present that has an extended frequency range, and still uses the same remote control commands.
Be careful changing these setting as RadiMation® is no longer able to verify if the GAUSS INSTRUMENTS TDEMI X3 is used outside frequency range that is specified by the manufacturer. This may result to serious damage of your measurement device.
The settings on the Reference tab influence the measurement frequency that is communicated to the measurement device. The frequency that is forwarded to the measurement device can for example be used by the device to perform the measurement on the correct frequency, or use the correct internal frequency dependant correction or calibration factor on the measurement result. Normally it is desired that the measurement frequency is the same as the carrier frequency of the signal generator. In some situations it can however be required to communicate a different frequency to the measurement device. In such a situation the settings on the Reference tab can be modified.
| Signal generator frequency
|
Selects that the actual carrier frequency of the signal generator is communicated to the measurement device. This is the default behaviour. |
| Fixed reference frequency
|
Selects that a fixed frequency (independent of the signal generator carrier frequency) is communicated to the measurement device. |
| Signal generator frequency offset
|
An additional offset frequency specified in MHz, that is added to frequency that is communicated to the measurement device. This value can be positive or negative, and defaults to 0.0 MHz. |
| Specific reference frequency
|
The fixed reference frequency specified in MHz that is communicated to the measurement device, when the Fixed reference frequency option is selected. |
 |
Warning: | When a different reference frequency is specified and communicated to the measurement device, it is only relevant for the measurement device. A correction file that is attached to the device driver in RadiMation® will still use the correction value that is specified for the actual signal generator carrier frequency. |
Configuration[edit]
The following tabs are available in the advanced configuration of the GAUSS INSTRUMENTS TDEMI X3:
The frequency range of the GAUSS INSTRUMENTS TDEMI X3 as provided by the manufacturer is shown and selected as default. It is possible to overrule these frequencies and to manual adjust the allowed frequency range of the GAUSS INSTRUMENTS TDEMI X3.
| Use default start frequency
|
If the checkbox is checked, the default start frequency will be used as the lowest usable frequency in a test for this device. |
| Custom start frequency
|
If the Use default start frequency checkbox is unchecked, another start frequency (expressed in MHz) can be specified. The customized start frequency will then be used as the lowest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default start frequency. |
| Use default stop frequency
|
If the checkbox is checked, the default stop frequency will be used as the highest usable frequency in a test for this device. |
| Custom stop frequency
|
If the Use default stop frequency checkbox is unchecked, another stop frequency (expressed in MHz) can be specified. The customized stop frequency will then be used as the highest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default stop frequency. |
Specifying a different frequency range can be useful if for example:
- A device (like a coupler, antenna, injection device, cable, etc...) is still useable (but out of specification) outside the standard suggested frequency range.
- An external mixer is used to measure an extended frequency range.
- An up- or down-convertor is used to shift the frequency range.
- A newer model of a device is present that has an extended frequency range, and still uses the same remote control commands.
Be careful changing these setting as RadiMation® is no longer able to verify if the GAUSS INSTRUMENTS TDEMI X3 is used outside frequency range that is specified by the manufacturer. This may result to serious damage of your measurement device.
TCPIP Connection[edit]
The GAUSS INSTRUMENTS TDEMI is controlled using an ethernet connection. The RadiMation® device driver is able to control the GAUSS INSTRUMENTS TDEMI using the TCPIP-stream or the VISA-stream. For these connections it is important that the destination port 21683 is used, because that is the network port that the TDEMI is listening on for new connections.
- For the TCPIP-stream the correct connection string is: tcpip://<IP-ADDRESS>:21683 (where <IP-ADDRESS> is the network IP address and 21683 is the default port of the TDEMI).
- For the VISA-stream the correct connection string for the Visa-ID is: TCPIP::<IP-ADDRESS>::21683::SOCKET (where <IP-ADDRESS> is the network IP address and 21683 is the default port of the TDEMI).
A GAUSS INSTRUMENTS TDEMI can only be controlled by a single program at the same time. This can raise problems when the TDEMI is controlled at the same time by multiple device drivers (like a Scanning Receiver and a LISN device driver). It is important that all TDEMI device drivers are using exactly the same communication addresses to ensure that only a single communication stream is used to communicate with the TDEMI.
Auto step frequency[edit]
When 'Auto step frequency' selected in RadiMation®, the device driver for the TDEMI will select half of the selected RBW bandwidth, and will configure that in the TDEMI. Thus a 1 MHz RBW will result in an auto step frequency of 500 kHz.
Frequency Bands[edit]
The TDEMI Ultra has a measurement bandwidth of 342.5 MHz in spectrogram mode, which can be increased to 685 MHz if the option 685M-UG is available. This limitation is specified on page 9 of the TDEMI Ultra data sheet, under the "Real-Time EMI Receiver (Spectrogram)" section. It is important to note that it is not possible to determine if option 685M-UG is available through the communication bus.
In spectrogram mode, the TDEMI X separates the measurement range into bands, which are up-mixed or down-mixed to the real-time bandwidth. The active band can be automatically switched to another band in receiver mode. The actual measurable bandwidths and bands depend on the selected RBW, which can result in different limitations.
It is important to keep in mind that the limitations of the TDEMI cannot be fixed by RadiMation if the hardware is unable to perform the requested measurement. The best way to determine the actual allowed bands on the TDEMI is to try to perform the measurement manually. If manually configuring the TDEMI to perform a spectrogram mode measurement from 30 MHz up to 1 GHz, The device would also not be able to perform that measurement. To determine the actual allowed bands on the TDEMI, it is best to perform a manual measurement and use the allowed and working frequency bands to configure the test in RadiMation.
It is not possible to provide the correct start and stop frequencies of each band in spectrogram mode, as this depends on the selected RBW and installed options. In the past, an error (https://wiki.radimation.com/wiki/index.php/RadiMation_Error:_805322375 ) was raised if the configured frequency range was limited by the TDEMI, but it is unclear if this is still the case in newer firmware versions.
Configuration[edit]
The following tabs are available in the advanced configuration of the GAUSS INSTRUMENTS TDEMI X3:
On the Communication tab, the desired communication method can be selected and configured. Depending on the selected method, additional relevant settings are shown and can be configured.
| Communication Streams
|
Selects the medium or method that should be used to communicate with the device. Depending on the capabilities of the device this can be one or more of:
See the Communication Settings in Chapter 15, on how to configure each of these methods. |
On the Identification tab, the expected *IDN? response of the test and measurement device can be configured. It is used to determine if the correct test and measurement device is connected.
| Expected response
|
The expected *IDN? response of a device. It can be changed in the case the commands are the same for another device for which no RadiMation® driver is available yet. |
| Restore default
|
Restores the original Exepected response. |
The frequency range of the GAUSS INSTRUMENTS TDEMI X3 as provided by the manufacturer is shown and selected as default. It is possible to overrule these frequencies and to manual adjust the allowed frequency range of the GAUSS INSTRUMENTS TDEMI X3.
| Use default start frequency
|
If the checkbox is checked, the default start frequency will be used as the lowest usable frequency in a test for this device. |
| Custom start frequency
|
If the Use default start frequency checkbox is unchecked, another start frequency (expressed in MHz) can be specified. The customized start frequency will then be used as the lowest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default start frequency. |
| Use default stop frequency
|
If the checkbox is checked, the default stop frequency will be used as the highest usable frequency in a test for this device. |
| Custom stop frequency
|
If the Use default stop frequency checkbox is unchecked, another stop frequency (expressed in MHz) can be specified. The customized stop frequency will then be used as the highest usable frequency in a test for this device. The customized frequency can be a limitation or an extension of the default stop frequency. |
Specifying a different frequency range can be useful if for example:
- A device (like a coupler, antenna, injection device, cable, etc...) is still useable (but out of specification) outside the standard suggested frequency range.
- An external mixer is used to measure an extended frequency range.
- An up- or down-convertor is used to shift the frequency range.
- A newer model of a device is present that has an extended frequency range, and still uses the same remote control commands.
Be careful changing these setting as RadiMation® is no longer able to verify if the GAUSS INSTRUMENTS TDEMI X3 is used outside frequency range that is specified by the manufacturer. This may result to serious damage of your measurement device.
The CISPR tab of the GAUSS INSTRUMENTS TDEMI X3 allows to configure if the CISPR or non-CISPR detectors should be used during the measurements.
| Use CISPR detector Average (if applicable)
|
If the checkbox is checked, the CISPR Average (indicated as the 'CAV' detector) will be used during the measurements. If the checkbox is not checked, the standard Average detector will be used. |
| Use CISPR detector RMS (if applicable)
|
If the checkbox is checked, the CISPR RMS (indicated as the 'CRMS' detector) will be used during the measurements. If the checkbox is not checked, the standard RMS detector will be used. |
Be aware that it is tried to activate the CISPR detector. If the selection of the CISPR variant of the detector is not possible, the standard detector will be selected, and now warning or error will be raised.