1. Introduction
The UNI-T UT701 and UT705 are high-performance, hand-held calibrators designed for precise temperature and loop calibration and maintenance. These devices offer stable performance and high accuracy, making them ideal for industrial applications. The UT701 specializes in temperature calibration, providing various thermocouple and RTD outputs, while the UT705 focuses on loop calibration with DC current and voltage measurement and output functions.
Figure 1: UNI-T UT701 and UT705 Calibrators showcasing high accuracy and stability.
2. Key Features
UT701 Temperature Calibrator:
- Provides voltage, resistance, 10 kinds of thermocouple (J/K/T/E/R/S/B/N/Wre) and 4 kinds of RTD outputs.
- Automatic and manual cold junction temperature compensation for thermocouple outputs.
- Automatic stepping and ramping functions for fast linearity detection.
- 25% stepping function for quick linearity checks.
- Store/recall feature to improve user efficiency.
UT705 Loop Calibrator:
- Measures DC voltage, DC current, and 4-20mA loop current.
- Output functions include DC current, analog transmitter, and 24V loop power.
- Achieves up to 0.02% accuracy for current measurement.
- Automatic ramp for DC current output.
- Manual stepping and automatic stepping and ramping output.
- Stores and recalls setups.
- Features LCD backlight and auto power off.
- 1m drop proof design for durability.
3. Product Components
3.1 Front Panel Overview
Figure 2: Front Panel of UNI-T UT701 Calibrator. Features a large LCD display, function buttons (V/I/Q, RTD, TC, SET 100%, SET 0%, ESC, SETUP), navigation/percentage buttons, and input terminals (4W, V/mV/Ω/TC/RTD, COM, 3W).
Figure 3: Front Panel of UNI-T UT705 Calibrator. Features a large LCD display, function buttons (MEAS/SOURCE, LOOP, V, mA, SET 100%, SET 0%), navigation/percentage buttons, and input terminals (24V, V, COM, mA, SIM, LOOP).
3.2 Rear Panel Overview
Figure 4: Rear Panel of the Calibrator. Includes the battery compartment and a warning label regarding electrical shock and battery replacement.
3.3 Included Accessories
Figure 5: Standard package contents. Includes the calibrator unit, test leads, English manual, and a cloth bag. Note: Batteries are not included due to international shipping regulations.
4. Setup
4.1 Battery Installation
- Ensure the calibrator is powered off.
- Locate the battery compartment on the rear panel of the device (refer to Figure 4).
- Open the battery compartment cover.
- Insert a 9V (6F22) battery, observing the correct polarity.
- Close the battery compartment cover securely.
WARNING: To avoid electrical shock, remove test leads before opening the case. Install battery and quick-acting fuses with the correct voltage ratings as shown in the operating manual.
4.2 Connecting Test Leads
Connect the provided test leads to the appropriate input/output terminals on the calibrator's front panel based on the measurement or source function you intend to use. Refer to Figure 2 for UT701 terminals and Figure 3 for UT705 terminals.
5. Operating Instructions
This section provides general operating guidelines. For detailed instructions on specific functions, please refer to the comprehensive English manual included in your package.
5.1 Power On/Off
Press the power button (usually marked with a 'circle with a line' symbol) to turn the calibrator ON or OFF.
5.2 UT701 Temperature Calibrator Operation
- Selecting Output Type: Use the dedicated buttons (e.g., V/I/Q, RTD, TC) to select the desired output type (voltage, resistance, RTD, or thermocouple).
- Thermocouple/RTD Type Selection: When TC or RTD is selected, use the SETUP button to cycle through different thermocouple types (J/K/T/E/R/S/B/N/Wre) or RTD types.
- Setting Output Value: Use the navigation buttons (up/down/left/right arrows) and percentage buttons (0%, 25%, 100%) to adjust the output value.
- Cold Junction Compensation: The UT701 features automatic and manual cold junction compensation for thermocouple outputs. Refer to the full manual for manual compensation procedures.
- Automatic Stepping and Ramping: Utilize the automatic stepping and ramping functions for efficient linearity testing. Consult the manual for configuration details.
5.3 UT705 Loop Calibrator Operation
- Measurement Functions: Use the MEAS/SOURCE button to switch between measurement and source modes. In measurement mode, you can measure DC voltage, DC current, and 4-20mA loop current.
- Source Functions: In source mode, you can output DC current, simulate a transmitter, or provide 24V loop power.
- Setting Output Value: Use the navigation buttons and percentage buttons (0%, 25%, 100%) to adjust the output value for current or voltage sourcing.
- Stepping and Ramping: The UT705 supports manual and automatic stepping and ramping outputs for various calibration tasks.
- 24V Loop Power: Connect to the 24V and COM terminals to provide loop power for external devices.
5.4 Store/Recall Setups
Both models allow you to store and recall frequently used setups. Refer to the included manual for specific instructions on how to save and load configurations.
6. Specifications
Below are the general specifications for the UT705 model. Please refer to the full manual for detailed specifications of both UT701 and UT705.
Figure 6: Detailed Specifications for UNI-T UT705 Calibrator.
| Characteristic | Description |
|---|---|
| Power | 9V battery (6F22) |
| Display | 63mm x 40mm |
| Product color | Red and grey |
| Product net weight | 410g |
| Product size | 96mm x 193mm x 47mm |
| Standard accessories | Test leads, English manual, cloth bag |
7. Maintenance
7.1 Cleaning
Wipe the device with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is completely dry before use.
7.2 Battery Replacement
When the low battery indicator appears on the display, replace the 9V battery promptly to ensure accurate operation. Refer to Section 4.1 for battery installation instructions.
7.3 Storage
Store the calibrator in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the battery to prevent leakage.
8. Troubleshooting
If you encounter issues with your calibrator, try the following basic troubleshooting steps:
- Device does not power on: Check if the battery is correctly installed and has sufficient charge. Replace the battery if necessary.
- Inaccurate readings/outputs: Ensure test leads are securely connected and not damaged. Verify the correct function and range are selected. Perform a self-test or calibration check if available (refer to the full manual).
- Display issues: If the display is dim, replace the battery. If segments are missing or erratic, power cycle the device.
For more complex issues, consult the detailed troubleshooting section in the complete English manual or contact UNI-T customer support.
9. Warranty and Support
UNI-T products are manufactured to high-quality standards. For information regarding warranty coverage, technical support, or service, please refer to the warranty card included with your product or visit the official UNI-T website. Keep your purchase receipt as proof of purchase for warranty claims.
10. About UNI-T
Video 1: UNI-T Company Introduction. This video provides an overview of UNI-T's history, commitment to innovation, and range of test and measurement products.
