The B&K Precision manual for models 1785A, 1786A, and 1787A covers the setup, operation, and troubleshooting of programmable DC power supplies, including instructions for general and standard operation modes, as well as the use of a PC interface. It provides detailed steps for manual operation, pre-set programming, and handling over-voltage protection, ensuring users can effectively manage voltage and current settings while addressing potential errors.
Manual Overview
The B&K Precision programmable DC power supplies models 1785A, 1786A, and 1787A are designed for precise voltage and current control, featuring a micro-controller-based system with both digital and analog controls. Troubleshooting begins with a self-diagnostic routine upon startup, where the displays count from zero to nine. If an over-voltage condition occurs, the unit triggers an O.V.P. (over-voltage protection), displaying an E-Err warning and cutting power. To resolve, switch off the unit, remove all loads, and restart. Persistent issues require service center intervention. Calibration involves setting voltage and current manually or using the pre-set feature, which stores up to nine configurations. Error codes appear if settings exceed the unit’s capabilities, prompting re-entry of valid values. The unit operates in constant voltage (CV) or constant current (CC) modes, indicated by corresponding displays. The RS-232 interface option allows PC connectivity for remote control. Board-level guidance includes fuse specifications and replacement procedures, ensuring protection against electrical faults. The manual emphasizes reading instructions thoroughly to maximize the unit’s benefits.
Quick Issues Covered
- Diagnose power-up failures with start-up self-diagnostic routine.
- Error code E-Err indicates over voltage protection activation.
- Calibrate voltage/current settings using manual or pre-set methods.
Overview
The product is a high-quality micro-controller based programmable DC power supply with models 1785A, 1786A, and 1787A. It features a digital operation control and an analog output control, combining the advantages of digital systems with the clean supply and quiet operation of analog systems. The unit has a total supply capability of 90W and offers an optional RS-232 interface for PC connectivity. The manual covers specifications, controls and indicators, operating instructions including general operation, standard operation mode, timed operation mode, precautions for use, and using the PC interface.
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 of 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.
8. CV Display: Indicates the unit is in constant voltage mode.
9. Keypad: 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 instructions for operating the programmable DC power supplies. Upon switching on the unit, it performs a self-diagnostic routine where displays count from zero to nine. The unit enters standard operation mode, assuming previous voltage and ampere settings. Users should ensure equipment is not connected if unsure of previous settings. The unit maintains maximum set voltage or current, indicated by the C.V. (constant voltage) or C.C. (constant current) display. An over-voltage protection feature triggers an E-Err warning if voltage exceeds set values, cutting power delivery. In such cases, users should switch off the unit and remove loadings.
In standard operation mode, users can set voltage and current manually or use pre-set settings. For manual operation, users press ‘ENTER’, set the voltage and current using the keypad, and confirm by pressing ‘ENTER’ again. The unit maintains these settings until reprogrammed.
The unit can store nine pre-programmed voltage and current settings, which remain stored even when switched off. To program pre-sets, users press ‘PROG’, select a location (1 to 9), set the voltage, press ‘ENTER’, and then set the current.
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-1786a manual: Guide for technicians to troubleshoot and calibrate the 1786a model efficiently. File size: 507.6 KB.
- Brand: Bk-precision-1786a-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-1786a-instruction MANUAL Overview
The Bk-precision-1786a is a versatile digital multimeter designed for precise electrical measurements in both professional and hobbyist environments. This device provides accurate readings for voltage, current, resistance, and continuity testing, making it an essential tool for troubleshooting and diagnosing electrical circuits.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for easy reading in low light conditions
- Auto and Manual Ranging Modes for flexible measurement options
- Data Hold and Max/Min Recording to capture and review readings
- Overload Protection on all ranges to ensure device safety
- Battery Operated with low battery indicator
- Compact and ergonomic design for comfortable handling
Basic Usage and Operation Tips
Before using the Bk-precision-1786a, ensure the device is properly calibrated and the battery is fully charged. Select the appropriate measurement mode using the rotary switch. Always connect the test leads to the correct input terminals and verify the circuit is de-energized before measuring resistance or continuity. For AC measurements, use the AC setting and ensure the probes are securely connected. Utilize the data hold function to freeze readings when working in difficult-to-see areas.
Troubleshooting and Maintenance
If the multimeter displays erratic readings or fails to power on, check the battery condition and replace if necessary. Inspect the test leads for damage or wear, as faulty leads can cause inaccurate measurements. Clean the device regularly with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. If the device continues to malfunction, consult the manual for detailed troubleshooting steps or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1786a. Avoid measuring voltages beyond the specified limits to prevent electric shock or damage. Use insulated test leads and never touch exposed metal parts during operation. Ensure the device is rated for the environment in which it is used, and never operate the multimeter in wet or explosive atmospheres.