The B&K Model 290 manual provides detailed instructions for setting up and operating the electronic multimeter, including measuring DC and AC voltages, resistances, and currents, as well as performing calibration and maintenance. It also offers troubleshooting guidance, emphasizing protection against accidental overloads and ensuring accurate measurements through features like a mirrored scale and high input impedance.
Manual Overview
The service manual for the B&K Precision Model 290 Electronic Multimeter provides detailed guidance on troubleshooting, error diagnostics, calibration, and board-level adjustments. The manual emphasizes the importance of understanding the operating controls, including the mechanical meter zero adjustment, function switch, range switch, and the off-on switch with zero control. For troubleshooting, the manual outlines a systematic approach to diagnosing issues, focusing on the correct use of the function and range switches to ensure accurate measurements. Error codes and diagnostics are not explicitly detailed, but the manual stresses the importance of proper calibration and maintenance to prevent errors. Calibration involves adjusting the meter zero and OHMS control to ensure precise readings. The manual also provides specifications for measuring DC and AC voltages, currents, and resistances, highlighting the high input impedance and protection features against overloads. Board-level guidance includes understanding the circuit description and the role of semiconductors and diodes in the multimeter’s operation. Regular maintenance and adherence to safety precautions are advised to maintain the instrument’s accuracy and longevity.
Quick Issues Covered
- Diagnoses power-up failures via mechanical zero adjust procedure.
- Calibrates zero center DC voltages for accurate measurements.
- Includes schematics for effective circuit tracing and troubleshooting.
Overview
The B & K Model 290 is an extended-range, solid-state electronic multimeter designed for radio and TV service technicians, industrial users, engineers, and hobbyists. It features high input impedance for minimal circuit loading, full AC operation without batteries, and protection against accidental overloads. The manual covers general description, specifications, operating controls, measurement procedures for various electrical parameters, calibration, maintenance, and warranty service instructions.
Specifications
- DC VOLTS:
- 10 Ranges: 50mV, 150mV, 500mV, 1.5V, 5V, 15V, 50V, 150V, 500V and 1500V full scale.
- Accuracy: + 1.5% full scale.
- Input Resistance: 15 Megohms, + 1.5% including 100K isolating resistor in probe.
- Normal Mode Rejection: Better than 46 dB @ 60 Hz for + 2% accuracy change.
- AC VOLTS:
- 10 RMS Ranges: 50mV, 150mV, 500mV, 1.5V, 5V, 15V, 50V, 150V, 500V and 1500V full scale.
- 10 Peak-to-Peak Ranges: 140mV, 440mV, 1.4V, 4.4V, 14V, 44V, 140V, 440V, 1400V and 4400V full scale.
- Input Impedance: 14.9 Megohms shunted by approximately 41pf at input jacks. (140pf with PR-21 Probe).
- Frequency Response: +.5dB, 20Hz to 500kHz to 150V, + 3dB, 5Hz to 750kHz to 150V, + 3dB, 5Hz to 20kHz over 150V.
- Accuracy: + 3% full scale @ 60Hz, +5% on 500V and 1500V ranges.
- Common Mode Rejection: Better than 40 dB @ 60Hz.
- OHMS MEASUREMENT:
- 8 Low Voltage Ranges RX0.1, RX1, RX10, RX100, RX1K, RX10K, RX100K, RX1M.
- 7 Normal Voltage Ranges RX1, RX10, RX100, RX1K, RX10K, RX100K, RX1M.
- Midscale Reading: 10 (times multiplier)
- Accuracy: +3° of arc, (+4° of arc on RX0.1 and RX1M ranges).
- DC CURRENT:
- 10 Ranges: 50uA, 150uA, 500uA, 1.5mA, 5mA, 15mA, 50mA, 150mA, 500mA and 1.5 Amp full scale.
- Accuracy: + 3% full scale; +4% on 1.5 Amp Range.
- Internal Voltage Drop: 50mV at instrument input terminals, to 50mA range.
- AC CURRENT:
- 10 Ranges: 50uA, 150uA, 500uA, 1.5mA, 5mA, 15mA, 50mA, 150mA, 500mA, and 1.5 Amp full scale.
- Accuracy: + 4% full scale @ 60Hz, +5% on 50uA and 1.5 amp ranges.
- Internal Voltage Drop: 50mV, at instrument input terminals, to 50mA range.
- Frequency Response: +.5dB, 20Hz to
Controls & Indicators
The front-panel controls of the Model 290 Electronic Multimeter include:
1. Meter Zero Adjust (Mechanical): Adjusted before the instrument is turned on using a screwdriver in the slot below the meter face.
2. Function Switch: Selects the desired function for measurements.
3. Range Switch: Selects the desired range of current, voltage, or resistance.
4. Off-On Switch and Zero Control: Turns the meter on/off and positions the pointer at zero.
5. Ohms Control: Adjusted with the function switch in an OHMS position for a full-scale indication.
Installation / Setup
Refer to the PDF for details.
Operation
The operation and basic usage steps for the Model 290 Electronic Multimeter include the following:
1. Meter Zero Adjust (Mechanical): Before turning on the instrument, adjust the mechanical meter zero using a screwdriver in the slot below the meter face. Tap the meter gently and turn the adjuster slowly until the pointer rests at zero.
2. Function Switch: Selects the desired function for the measurements to be performed.
3. Range Switch: Selects the desired range of current, voltage, or resistance to be measured.
4. Off-On Switch and Zero Control: Pull the ZERO control shaft outward to turn the meter on, indicated by a glowing red lamp. Rotate the ZERO control to set the pointer at zero on the meter scale or at the zero center. Push the ZERO control shaft in to turn the meter off.
5. Ohms Control: With the FUNCTION switch in an OHMS position and test leads open, adjust the OHMS control for a full-scale indication.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 2.3 MB)
Bk-precision-290 service manual PDF: troubleshoot, calibrate, and maintain equipment efficiently. File size: 2.3 MB.
- Brand: Bk-precision-290-instruction-service
- Model: MANUAL
- Type: Service manual
- File size: 2.3 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-290-instruction-service Overview
The Bk-precision-290 is a versatile and reliable piece of test equipment designed for precise electrical measurements and diagnostics. Ideal for both professional technicians and hobbyists, this device offers accurate readings for voltage, current, resistance, and other electrical parameters. Its robust construction and user-friendly interface make it suitable for a wide range of applications in electronics repair, maintenance, and quality control.
Main Features and Specifications
- Measurement Types: AC/DC Voltage, AC/DC Current, Resistance, Continuity
- Display: Large, easy-to-read digital LCD with backlight
- Measurement Range: Up to 600V DC/AC, 10A current
- Accuracy: ±(0.5% + 2 digits) for voltage measurements
- Additional Functions: Data hold, auto-ranging, diode test
- Power Supply: Battery operated with low battery indicator
- Safety Rating: CAT II 600V
Basic Usage and Operation Tips
Before using the Bk-precision-290, ensure the device is powered on and the battery level is sufficient. Select the appropriate measurement mode using the rotary switch. Connect the test leads securely to the device and the circuit under test. For accurate results, start with the highest range and adjust downward as needed. Use the data hold function to freeze readings for easier analysis. Always disconnect the test leads when changing measurement modes to avoid damage.
Troubleshooting and Maintenance
If the device fails to power on, check the battery and replace it if necessary. Inaccurate or unstable readings may indicate worn test leads or dirty contacts—inspect and clean as needed. Avoid exposing the device to extreme temperatures or moisture. Regularly calibrate the instrument according to the manufacturer’s guidelines to maintain measurement accuracy. Store the device in a dry, dust-free environment when not in use.
Safety Reminder
Always observe proper safety precautions when working with electrical equipment. Do not exceed the specified voltage and current limits of the Bk-precision-290. Use insulated test leads and avoid contact with live circuits to prevent electric shock. Follow all local regulations and standards for electrical testing and maintenance.