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Check the datasheet for the product in question to find more information.

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For this note, we will be using the SIGLENT CP4020 current probe and the SDS1104X-E oscilloscope as well as an SPD1168X power supply.

1. Let’s check the noise floor of the scope. The SDS1104X-E has a 500 uV/division minimum scale. The channel noise (with no input connection/CH1 open) is approximately 1 division (500 uV p-p):

2. Now, let’s connect the probe, turn it on, and switch the gain to the most sensitive setting. In this case, 50 mV/A:

The noise on the 500 uV/div vertical scale is dominating the screen.. so we can adjust the scale until we get some headroom… 5 mV/div is better..

10 mV/div even more so.

3. Now, let’s enable averaging. For continuous (DC) outputs or repeated waveforms, averaging can be used to minimize random noise:

4. We can also use the Zero function of the probe to minimize the DC offset of the measurement. Now, our open-circuit voltage average is near 0 V.

5. Now, we can set the Units of Channel 1 to Amps (as we are measuring current) by pressing 1 to open the channel options menu. Set units to A and then select a custom scale factor so that the proper readings are displayed on the oscilloscope.

The probe is set to the 50 mV/A gain setting.

The scope always measures Volts.. so we would like to get this into Amps-per-Volt (A/V) so that we are converting the input signal (in Volts) to current (Amps)

The inverse of the probe gain is 1/(50 mV/A) = 0.02 A/mV * 1000 mV/V = 20 A/V

So, a 1 A current will provide a voltage at the scope of 50 mV/A * 1 A

6. Now, test the setup by sourcing a simple DC current with a power supply and a suitable wire to carry the current:

I enabled a mean measurement which shows the value of the average signal input:

The final estimate is that the CP4020 and XE scope have a low current measurement of approximately 50 mA.

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Many instruments support communication via sockets (port 5025) and telnet (port 5024) but the port numbers cannot be changed.

If you use VISA, you can implement LAN via TCP/IP, which does not need a port number.

Here is a listing of current SIGLENT instruments with Socket and Telnet Support.

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The menu will show used/total amounts.

Here, the SDG6X has approximately 83 MB and the SDG1X has 85 MB of memory:

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Examples of NRTLs include UL, CSA, and TUV.

Many SIGLENT products are TUV certified, which also covers UL and CSA requirements.

To find out if a specific product is TUV certified, you can check the latest on the TUV website:

Certificate Explorer| TÜV SÜD

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In some cases, you may wish to directly connect your computer to an instrument LAN port without a LAN available.

This requires:

1. A crossover Ethernet cable. A through type cable will not work because most instrumentation does not have Tx/Rx switching capability at the physical LAN connection.

OR

2. An Ethernet switch and “through” type cables. Here, the switch configures the Tx/Rx routing and no special cabling is required.

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Binary data formatting often provides the smallest payload size and therefore transfers via USB/LAN more quickly. Unfortunately, binary is very difficult to interpret by humans. So, binary data is often reformatted to other types (ASCII, etc..)/

Here is a link to the binary data format for many popular SIGLENT oscilloscopes:

Extract Binary Data from an SDS oscilloscope

The current document supports the following series:

SDS1000X Series

SDS1000X-E Series

SDS2000X Series

SDS2000X-E Series

SDS2000X Plus Series

SDS5000X Series

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The trigger status indication is located near the upper-right-hand side of the display, as indicated in this picture:

Here are their definitions:

Armed. The oscilloscope is acquiring pre-trigger data. All triggers are ignored in this state.

Ready. All pre-trigger data has been acquired and the oscilloscope is ready to accept a trigger.

Trig’d. The oscilloscope has seen a trigger and is acquiring the post-trigger data.

Stop. The oscilloscope has stopped acquiring waveform data.

Auto. The oscilloscope is in auto mode and is acquiring waveforms in the absence of triggers.

Scan. The oscilloscope is acquiring and displaying waveform data continuously in scan mode.

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