This article discusses six common issues engineers face during data acquisition recorder testing, covering configuration, testing, communication, display, and storage. It provides practical solutions for typical problems that may arise during the process. This series will be updated regularly to ensure ongoing support and guidance.
The article starts by explaining how to set up the data acquisition recorder interface, whether using the DP100 screen or a web browser on the PC side. Users must choose between automatic or manual configuration in the "Board Configuration" section. Once this is done, parameters such as AI channels can be adjusted according to specific test requirements, as shown in Figure 2.
Figure 2: Channel Settings
**First, Configuring the Data Acquisition Module**
Both DP100 and DM100 can support up to 200 channels. When configuring the module, it's important to consider the test requirements. There are three key points to note:
- The DM100 host requires a power module, while the DP100 does not.
- If the DP100 has more than 30 channels (or 3 modules), an expansion module must be used, and it requires a power module to function.
- For large-scale tests with many channels, such as 100, it’s crucial to understand the test environment and properly configure the expansion module to ensure optimal performance, as illustrated in Figure 3.
Figure 3: Oven Line Temperature Test
**Second, Interface Display Issues: Positive Overflow or Break**
As shown in Figure 4, the interface might display positive overflow, positive break, or negative break for channels like X0101/X0102/X0103. These issues usually result from disconnected or poorly connected thermocouples. To resolve them, verify the terminal connections.
Figure 4: Broken Thermocouple Display
The settings for positive overflow, positive break, and negative break are shown in Figure 5. You can choose:
- **Do Not Use**: When the sensor is broken, the measured value shows as “positive overflow.â€
- **Positive Display**: When the sensor is broken, the value is fixed to the positive range overflow value, showing as “positive break.â€
- **Negative Display**: When the sensor is broken, the value is fixed to the negative range overflow value, showing as “negative break.â€
Figure 5: Breaking Setting
**Third, Temperature Rise Test**
1. **Main Steps**
As shown in Figure 7, the second channel (X0002) displays the temperature rise value. The steps include:
- Under “AI Channel,†enter “Range†and select “Delta.â€
- Set the reference channel to X0001, as shown in Figure 6.
Figure 6: Delta Operation Settings
After setting, you can view the temperature rise value in the overall interface. For example, X0002 shows a 7.6°C increase compared to X0001, which is in the ambient air, as shown in Figure 7.
Figure 7: Delta Operation Temperature Rise Display
2. **Main Benefits**
This method eliminates the need for manual calculations using Excel after data export, improving efficiency. It also ensures real-time accuracy even when ambient temperatures change.
**Fourth, Information Marking in Trend Charts**
As shown in Figure 8, you can set information tags in the display settings. For instance, you can label information numbers 1 and 2 as start and end points.
Figure 8: Tag Information Settings
In the trend chart, click on the desired mark and select the relevant information for labeling, as shown in Figure 9.
Figure 9: Information Tag
These tags work similarly to oscilloscope markers, making it easy to locate important points quickly.
**Fifth, Communication in Data Acquisition**
There are three main types of communication between the data acquisition system and external devices:
- **With the "Zhiyuan Power Meter":** Use SCPI commands via Ethernet. Detailed steps are outlined in the sixth section.
- **With other devices:** Use Modbus over Ethernet to read values from device registers.
- **With other devices:** Use Modbus through serial ports (DP100 supports RS485/422/232; DM100 supports RS485/422).
The general interface settings are shown in Figure 10.
Figure 10: Data Acquisition and External Device Communication Settings
When using Modbus over Ethernet, the two devices are referred to as client and server. When using serial communication, they are called master and slave.
**Sixth, Connecting the Data Acquisition to Our Power Meter**
1. **Main Steps**
Ensure the computer, data acquisition, and power meter are on the same network segment. Connect one end of the network cable to the computer, power meter, and data acquisition, and the other end to the router or switch.
Enter the IP address in the browser, go to the connection interface, and select “Network Settings.†Then choose “Power Meter Basic Settings†and turn the power meter function “On,†as shown in Figure 11.
Figure 11: Power Meter Function On
Next, select “Power Meter Server Settings,†enable the server, set the server IP (power meter IP), and choose the corresponding power meter model, as shown in Figure 12.
Figure 12: Power Meter Server Settings
Go to “Power Meter Data Distribution Settings,†select the server number from the previous step, and set the “Data Group Name,†“Data Name,†“Exponential Zoom,†and “Communication Channel†(used to display the slave power meter’s value), as shown in Figure 13.
Figure 13: Power Meter Data Distribution Settings
In the “Settings†interface, switch to “Communication Channel†and set the “Upper/Lower Limit†parameters, as shown in Figure 14.
Figure 14: Communication Channel Settings
After setup, switch to the “Overview†interface of the “Data†tab. You should see the power count value collected by the data acquisition, as shown in Figure 15.
Figure 15: Communication Channel Value Display
Note: Since the data acquisition and power meter communicate via Ethernet using SCPI commands, make sure to disable Modbus on the power meter (in the interface button).
2. **Main Benefits**
This setup allows convenient comparison of voltage, current, and power readings with temperature data. For example, you can check if a certain point's temperature exceeds limits at a given power level.
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