The B&K Model 277 Solid State Electronic Multimeter manual provides detailed instructions for setup, operation, and troubleshooting, including descriptions of operating controls such as the meter zero adjust, function switch, range switch, and probe switch. It also emphasizes safety precautions when working with electrical equipment, such as keeping one hand in your pocket to minimize shock risk and using an isolation transformer for equipment with chassis tied to the AC power line.
Manual Overview
The B&K Model 277 Solid State Electronic Multimeter is designed for radio and TV service technicians, industrial users, engineers, and hobbyists. It features high input impedance for minimal circuit loading, low power drain for extended battery life, and protection against accidental overloads. The multimeter offers nine DC voltage ranges with an accuracy of ±2% full scale and nine AC voltage ranges with an accuracy of ±3% full scale. It also includes low and normal voltage ohms tests for resistance measurement and testing components like ICs and transistors. The device is protected by a fuse, except on the 1 Amp range, and uses a mirrored scale meter for increased accuracy. The Model 277 includes a mechanical zero adjust, function switch, range switch, zero control, and ohms control for operation. Safety precautions emphasize the importance of familiarizing oneself with the equipment, using an isolation transformer, and maintaining proper insulation to minimize shock hazards. Battery installation requires accessing the compartment on the rear cover.
Quick Issues Covered
- Diagnose power-up failures with battery check and installation guide.
- Troubleshoot measurement errors using zero and ohms control adjustments.
- Circuit tracing aided by detailed schematics and component descriptions.
Overview
The B & K Model 277 is a solid state FET input electronic multimeter designed for radio and TV service technicians, industrial users, engineers, and hobbyists. It features high input impedance for minimal circuit loading, low voltage and normal voltage ohms tests, low power drain for extended battery life, protection from accidental overloads, an adjustable handle, and a mirrored scale meter for increased accuracy. The manual covers general description, special features, specifications, operating instructions, safety precautions, maintenance, and circuit description.
Specifications
- DC VOLTS:
- 9 Ranges: -1, 3, 1, 3, 10, 30, 100, 300, 1000V full scale.
- Accuracy: +2% full scale.
- Input Resistance: 15 Megohms, +2%, including 100K isolating resistor in probe.
- AC Rejection: 20db minimum @ 60Hz for 2% accuracy change.
- AC VOLTS:
- 9 RMS Ranges: .1, .3, 1, 3, 10, 30, 100, 300, 1000V full scale.
- 9 Peak-to-Peak Ranges: -28, .88, 2.8, 8.8, 28, 88, 280, 880, 2800V full scale.
- Accuracy: +3% full scale @ 60Hz.
- Input Impedance: 10 megohms shunted by approximately 56pf at input jacks.
- Frequency Response: =+.5db, 20Hz to 140KHz.
- Approx. 3db @ 400KHz.
- OHMS MEASUREMENT:
- 7 Low Voltage Ranges (68mv): RX1, RX10, RX100, RXIK, RX10K, RX100K, RXIM.
- 7 Normal Voltage Ranges (1.5V): RX1, RX10, RX100, RX1K, RX10K, RX100K, RXIM.
- Midscale Reading: 10 ohms on RX1 Range.
- Accuracy: 3° of arc.
- DC CURRENT:
- 9 Ranges: Iya, 10ua, 100za, lma, 10ma, 30ma, 100ma, 300ma, 1 amp full scale.
- Accuracy: +3% full scale.
- Internal Voltage Drop: At instrument input terminals— 100my, all ranges.
- Thru input cable— 100mv on Iya to 30ma ranges.
- 140mv to 203mv on 100ma to 1 Amp range.
- DECIBEL (db):
- 9 Ranges: —20 to +62.
- Accuracy: +3% of full scale.
- Reference: Imw into 600 ohms. (.775v)
- MULTIPLIER AND SHUNT RESISTORS:
- 1% Precision Type: Frequency Compensated.
- METER: 414”, 50na, +2%.
- DC zero center ranges.
- Mirrored scale meter.
- PROTECTION: Meter and FET input protected from overloads.
- Circuit overload protection by fuse (.75 Amp), except 1 Amp range.
- SEMICONDUCTORS: (1) Dual N-Channel FET.
- (3) NPN Transistors.
- (3) Germanium Diodes.
- (6) Silicon Diode, I Amp, 600 PIV.
- BATTERIES REQUIRED: (1) NEDA 1604 (9 Volt).
- (Not Supplied) (1) #950 “D” Cell (114 Volt).
- DIMENSIONS: 7,4" H. x 548” W. x 35%" D.
- WEIGHT: 2 Ibs., 6 oz. (less batteries and probe assembly)
Controls & Indicators
The Model 277 Electronic Multimeter includes the following front-panel controls and indicators:
1. Meter Zero Adjust (Mechanical): This control is used to adjust the mechanical zero of the meter before turning on the device. It involves inserting a screwdriver into a slot below the meter face and adjusting until the pointer rests at zero.
2. Function Switch: This switch is used to turn the Model 277 on, check battery condition, and select the type of measurement to be performed. In the OFF position, the meter is damped for protection during transit.
3. Range Switch: This switch selects the desired range of current, voltage, or resistance to be measured.
4. Zero Control: This control is used to position the pointer of the meter at zero on the meter scale or at the zero center when using this feature.
5. Ohms Control: Adjusted with the test leads open, this control is rotated for a full scale indication, infinity (0) on the ohms scale of the meter.
6. Probe Switch: Equipped with a shielded test lead, this switch allows accurate a-c measurements in strong electrical fields. In the 100K position, a 100K resistor is switched in series with the test lead for d-c voltage measurements in certain circuits. The DIRECT position is used for all other measurements.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
A certain amount of danger is always present when working on electrical equipment, and therefore, the user is cautioned to always familiarize themselves as much as possible with the equipment to be tested before any work is performed. It should be kept in mind that high voltages often appear at unexpected points in defective equipment. When testing high voltage circuits, develop the habit of keeping one hand in your pocket to minimize the hazard of accidental shock. It is also important to have a properly insulated floor or floor covering to stand on while taking measurements. Be particularly careful to avoid contacting nearby objects which could provide a ground return path. A good practice is to remove operating power before connecting test leads. An isolation transformer should always be used in equipment having the chassis tied to one side of the a-c power line.
Download MANUAL Service manual (PDF – 4.4 MB)
Bk-precision-277-instruction-service manual: troubleshoot and calibrate the Bk-precision 277 model. File size: 4.4 MB.
- Brand: Bk-precision-277-instruction-service
- Model: MANUAL
- Type: Service manual
- File size: 4.4 MB
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
Download MANUAL service manual (PDF)
Bk-precision-277-instruction-service Overview
The Bk-precision-277 is a versatile precision instrument designed for accurate electrical measurements and testing. Ideal for both laboratory and field applications, this device provides reliable performance for technicians, engineers, and hobbyists. Its robust construction and user-friendly interface make it a dependable tool for a wide range of electrical diagnostics and calibration tasks.
Main Features and Specifications
- High-precision voltage and current measurement capabilities
- Wide measurement range suitable for various electrical parameters
- Clear digital display for easy reading of results
- Compact and durable design for portability and long-term use
- Multiple input options to accommodate different testing scenarios
- Overload protection to ensure device safety during operation
- Calibration adjustment features for maintaining measurement accuracy
Basic Usage and Operation Tips
Before using the Bk-precision-277, ensure the device is properly calibrated according to the manual instructions. Connect the test leads securely to the appropriate input terminals. Select the desired measurement mode and range to match the parameters you intend to measure. Always start with the highest range to avoid damage from unexpected high inputs. Read the displayed values carefully and record results as needed. After use, turn off the device and disconnect all test leads.
Troubleshooting and Maintenance Notes
If the device does not power on, check the battery status and replace if necessary. In case of inaccurate readings, recalibrate the instrument following the service manual guidelines. Inspect test leads and connectors regularly for wear or damage, replacing any faulty components. Keep the device clean and free from dust by wiping with a soft, dry cloth. Avoid exposure to extreme temperatures or moisture to prolong device lifespan.
Safety Reminder
Always observe proper safety precautions when working with electrical equipment. Ensure the device is rated for the voltage and current levels you intend to measure. Avoid contact with live circuits and use insulated test leads to prevent electric shock. Follow all manufacturer instructions and local safety regulations to ensure safe operation of the Bk-precision-277.