The manual for B&K Precision's programmable DC power supplies models 1785A, 1786A, and 1787A covers setup and operation instructions, including general and standard operation modes, as well as precautions for use and troubleshooting procedures. It also details the use of the optional RS-232 interface for PC connectivity and provides guidance on using the pre-set feature to store voltage and current settings.
Manual Overview
The B&K Precision models 1785A, 1786A, and 1787A are programmable DC power supplies designed for precision and flexibility. They feature a micro-controller-based system with digital operation control and an analog output, offering a blend of accuracy and quiet operation. The units support an optional RS-232 interface for PC connectivity. Troubleshooting begins with a self-diagnostic routine upon startup, where displays count from zero to nine. If an over-voltage condition occurs, the over-voltage protection (O.V.P.) feature triggers, cutting power and displaying an E-Err warning. Users should switch off the unit, remove all loads, and restart. Persistent issues require service center attention. Calibration involves setting voltage and current manually or using pre-set features, allowing storage of up to nine configurations. Error codes appear if settings exceed the unit’s capabilities, prompting re-entry. The units operate in constant voltage (C.V.) or constant current (C.C.) modes, indicated by respective displays. The manual emphasizes reading all instructions before use to ensure safe and effective operation.
Quick Issues Covered
- Self-diagnostic routine checks during power-up.
- E-Err warning for over voltage protection activation.
- Error codes for voltage/current settings beyond limits.
Overview
The product covered in the manual is a series of programmable DC power supplies, specifically models 1785A, 1786A, and 1787A. These units are micro-controller based and offer a total supply capability of 90W. They combine digital operation control with analog output control for ease and accuracy. The manual includes sections on specifications, controls and indicators, operating instructions, precautions for use, and using the PC interface. The power supplies also have an optional RS-232 interface for PC connectivity.
Specifications
- Output (DC) 0 – 18V 0 – 30V 0 – 60V
- Output Current (Amp.) 5 3 1.5
- Ripple & Noise (RMS) 1mV
- Line Regulation 0.02% + 5mV
- Load Regulation 0.02% + 5mV
- RS – 232 Option
- Operating Voltage 115/230 VAC , 50/60Hz
- Dimension (W.H.D.) 8.07 x 4.53 x 10.63 in. (205 x 115 x 270 mm)
- Accessory Supplied User Manual
- Weight App. 11 lbs (5 Kg)
- Display LED Voltmeter & Ammeter
- Cooling System Natural convection
- Power Consumption Approximate 220 VA / W | Approximate 200 VA/W
- Operating ambient temperature 41° to 104°F (5 to 40°C) 10 – 80% R.H.
- Input fuse F5 AC100V, 110V, 120V 5x20mm 3A 250V Fast Blow
- AC220V, 230V, 240V 5x20mm 2A 250V Fast Blow
- Internal fuse F1 5x20mm 0.5A 250V Fast Blow
- Internal fuse F2 5x20mm 0.5A 250V Fast Blow
- Internal fuse F3 5x20mm 0.5A 250V Fast Blow
- Internal fuse F4 5x20mm 0.5A 250V Fast Blow
Controls & Indicators
The front-panel controls and indicators for the programmable DC power supplies include:
1. Power Switch: Turns the power supply on and off.
2. Ammeter Display: Indicates output current.
3. Voltmeter Display: Indicates output voltage.
4. Output “+” Terminal (Red): Positive polarity output terminal.
5. Output “-” Terminal (Black): Negative polarity output terminal.
6. Ground “GND” Terminal (Green): Ground terminal connected to chassis.
7. CC Display: Indicates the unit is in constant current mode (also serves as a minute indicator in program mode).
8. CV Display: Indicates the unit is in constant voltage mode (also serves as a second indicator in program mode).
9. Keypad: Used for inputting settings.
10. Serial Port: Port for optional PC interface.
11. Main Cable: Connects the unit to power.
12. Fuse: Provides overcurrent protection.
Installation / Setup
Refer to the PDF for details.
Operation
The manual provides detailed steps for operating the programmable DC power supplies in both standard and timed operation modes. In standard operation mode, the user can set the voltage and current manually or use the pre-set feature to store up to nine pre-programmed settings. For manual operation, the user presses the ‘ENTER’ key to set the voltage and current levels using the keypad, ensuring they are within the unit’s capability. The pre-set feature allows storing and recalling settings even when the unit is off. The unit maintains the set voltage and current until reprogrammed.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 507.6 KB)
Bk-precision-1787a-instruction manual assists technicians in troubleshooting and calibrating the 1787A model. File size: 507.6 KB.
- Brand: Bk-precision-1787a-instruction
- Model: MANUAL
- Type: Manual
- File size: 507.6 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Bk-precision-1787a-instruction MANUAL Overview
The Bk-precision-1787a is a versatile digital multimeter designed for accurate electrical measurements in both professional and hobbyist environments. This device provides precise readings of voltage, current, resistance, and continuity, making it an essential tool for troubleshooting, testing, and maintaining electronic circuits and electrical systems.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings in various lighting conditions
- Auto and Manual Ranging for flexible measurement options
- Data Hold and Relative Measurement functions for enhanced usability
- Overload Protection to safeguard the device during improper usage
- Battery Powered with low battery indicator
- Compact and ergonomic design for ease of handling
Basic Usage and Operation Tips
Before using the Bk-precision-1787a, ensure the test leads are properly connected and the device is set to the correct measurement mode. Always start with the highest range when measuring unknown values to prevent damage. Use the data hold function to freeze readings for easier recording. When measuring current, connect the test leads in series with the circuit. For resistance measurements, ensure the circuit power is off to avoid inaccurate readings.
Troubleshooting and Maintenance
If the device displays erratic readings or no display, check the battery level and replace if necessary. Inspect test leads for damage or wear and replace if required. Clean the device exterior with a dry cloth and avoid exposure to moisture or extreme temperatures. Regularly verify calibration to maintain measurement accuracy. If problems persist, consult the manual or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when working with electrical equipment. Avoid measuring voltages or currents beyond the device’s specified limits. Use insulated test leads and wear appropriate personal protective equipment. Disconnect power sources before measuring resistance or continuity to prevent electric shock or damage to the multimeter.