1. Introduktion
The Mastech MS7221 Volt/mA Calibrator is a precision instrument designed for sourcing and measuring DC voltage and current signals. This device is essential for testing, calibrating, and troubleshooting industrial process control systems, PLCs, and transmitters. It offers high accuracy for both measurement and output functions, making it a versatile tool for professionals in various fields.
2. Sikkerhedsoplysninger
- Læs denne manual grundigt, inden du bruger apparatet.
- Always observe local and national safety codes and regulations.
- Do not operate the calibrator if it appears damaged or is not functioning properly.
- Ensure proper connection of test leads to avoid electrical shock or damage to the device.
- Do not exceed the maximum input ratings specified in this manual.
- The calibrator cannot be used for measurement and source simultaneously.
3. Produktet er slutview
The Mastech MS7221 features a clear display, intuitive controls, and robust input/output terminals. Familiarize yourself with the components shown below.
Figure 1: Mastech MS7221 Front Panel. This image displays the front of the Mastech MS7221 Volt/mA Calibrator. Key features visible include the large digital display at the top, showing "OUTPUT 0.000 V". Below the display are the power button (circular, labeled with a circle and vertical line), and two function selection buttons: "V/mV" (yellow) and "mA/%" (yellow). Further down, there's an "INPUT/OUTPUT" button and four arrow buttons for navigation and value adjustment. At the bottom, various input and output terminals are visible: "+LOOP", "mA INPUT", "COM", and "V INPUT/OUTPUT". Each terminal is clearly labeled with its function and maximum voltage/nuværende vurderinger.
3.1. Betjeningselementer og display
- Vise: 24000 counts, shows measured or sourced values.
- Tænd/sluk-knap (①): Tænder/slukker enheden.
- V/mV Button: Vælger lydstyrketage measurement or source mode.
- mA/% Button: Selects current measurement or source mode.
- INPUT/OUTPUT Button: Toggles between input (measurement) and output (source) functions.
- Arrow Buttons (▲, ▼): Adjust output values or navigate menus.
3.2. Input/output terminaler
- +LOOP: 24V loop supply output.
- mA INPUT: Current measurement input (Max 30V).
- COM: Common terminal for all measurements and sources.
- V INPUT/OUTPUT: Voltage measurement input and voltage source output (Max 30V).
4. Opsætning
4.1. Batteriinstallation
- Ensure the calibrator is powered off.
- Find batterirummet på bagsiden af enheden.
- Open the compartment and insert the required batteries, observing correct polarity.
- Luk batterirummet forsvarligt.
4.2. Første opstart
Press the Power button (①) to turn on the device. The display will illuminate and show the default operating mode.
5. Betjeningsvejledning
The MS7221 can either measure or source signals, but not simultaneously.
5.1. Måling af DC-volumentage (0-10V)
- Tilslut testledningerne til V INPUT/OUTPUT og KOM terminaler.
- Tryk på V/mV knap for at vælge voltage -tilstand.
- Tryk på INPUT/OUTPUT button to ensure "INPUT" mode is selected.
- Tilslut testledningerne til voltage kilde, der skal måles.
- Læs bindtage -værdi på displayet.
5.2. Sourcing DC Voltage (0-10V)
- Tilslut testledningerne til V INPUT/OUTPUT og KOM terminaler.
- Tryk på V/mV knap for at vælge voltage -tilstand.
- Tryk på INPUT/OUTPUT button to ensure "OUTPUT" mode is selected.
- Brug Pileknapper (▲, ▼) to adjust the desired output voltage.
- Connect the test leads to the device requiring the voltage input.
5.3. Measuring DC Current (0-24mA)
- Tilslut testledningerne til mA INPUT og KOM terminaler.
- Tryk på mA/% button to select current mode.
- Tryk på INPUT/OUTPUT button to ensure "INPUT" mode is selected.
- Connect the calibrator in series with the circuit where current is to be measured.
- Aflæs den aktuelle værdi på displayet.
5.4. Sourcing DC Current (0-24mA)
- Tilslut testledningerne til mA INPUT og KOM terminaler.
- Tryk på mA/% button to select current mode.
- Tryk på INPUT/OUTPUT button to ensure "OUTPUT" mode is selected.
- Brug Pileknapper (▲, ▼) to adjust the desired output current.
- Connect the test leads to the device requiring the current input.
5.5. 24V Loop Supply with Current Measurement
- Tilslut +LOOP terminal to the positive input of the device under test.
- Connect the negative input of the device under test to the mA INPUT terminal.
- Tilslut KOM terminal to the common ground of the system.
- Tryk på mA/% button to select current mode.
- Tryk på INPUT/OUTPUT button to ensure "INPUT" mode is selected.
- The display will show the current flowing through the loop.
6. Vedligeholdelse
6.1. Rensning
Tør enheden af med annonceamp cloth and mild detergent. Do not use abrasive cleaners or solvents. Ensure the device is powered off and disconnected from all circuits before cleaning.
6.2. Opbevaring
Store the calibrator in a cool, dry place, away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries to prevent leakage.
6.3. Udskiftning af batteri
When the low battery indicator appears on the display, replace the batteries as described in Section 4.1. Use only the specified battery type.
7. Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Enheden tænder ikke. | Døde eller forkert installerede batterier. | Udskift batterierne, og sørg for korrekt polaritet. |
| Incorrect readings. | Incorrect mode selected (Input/Output), faulty test leads, or incorrect connection. | Verify mode, check test leads for damage, ensure correct connections as per operating instructions. |
| No output signal. | "INPUT" mode selected instead of "OUTPUT", incorrect range, or open circuit. | Switch to "OUTPUT" mode, verify range, check circuit continuity. |
8. Specifikationer
| Parameter | Værdi |
|---|---|
| Vise | 24000 tæller |
| DC bindtage Mål | 0~100mV, 0~10V ±0.02% |
| DC bindtage Kilde | 0~100mV, 0~10V ±0.02% |
| DC Current Measure | 0~24 mA ±0.015% (of span) |
| DC Current Source | 0~24 mA ±0.015% (of span) |
| Løkkeforsyning | 24V |
| Dimensioner | 190 mm × 89 mm × 42 mm |
9. Garanti og support
Mastech products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your purchase or visit the official Mastech webwebsted. Gem din købsbevis til garantikrav.
