The B & K Model 290 instruction manual provides detailed guidance on setting up and operating the electronic multimeter, including descriptions of its operating controls, safety precautions, and procedures for measuring various electrical parameters such as DC and AC voltages, resistances, and currents. It also includes troubleshooting tips, calibration and maintenance instructions, and warranty service information to ensure optimal performance and long-term reliability.
Manual Overview
The service manual for the B&K Precision Model 290 Electronic Multimeter provides detailed guidance for troubleshooting, error diagnostics, calibration, and board-level adjustments. The manual emphasizes a structured troubleshooting flow, beginning with basic operational checks such as ensuring the mechanical zero adjustment is set before powering on the device. Error diagnostics are facilitated by the multimeter’s protection features, including diode protection for the meter and FET input, and circuit overload protection via a fuse. Calibration and adjustments are critical for maintaining accuracy, with specific instructions for setting the meter zero and using the OHMS control for resistance measurements. The manual also includes guidance on using the function and range switches to select the appropriate measurement settings. For board-level troubleshooting, the manual describes the internal components, such as dual N-channel FETs and various transistors and diodes, providing a comprehensive understanding of the multimeter’s circuitry. The manual ensures technicians can effectively maintain and troubleshoot the Model 290, ensuring reliable performance in various testing scenarios.
Quick Issues Covered
- Diagnose power-up failures with mechanical zero adjustment.
- Calibration procedures for accurate voltage and current measurements.
- Error codes for overload protection and fuse issues.
Overview
The B & K Model 290 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, full AC operation without batteries, and protection against accidental overloads. The manual covers specifications, operating controls, safety precautions, measurement techniques for various electrical parameters, calibration, maintenance, and warranty information.
Specifications
- DC VOLTS:
- 10 Ranges: 5OmV , 150mV , 50OnV , 1.5V , 5V , l 5V , 50V , 150V , 500V and 1500V full scale.
- Accuracy: ll.SVo full scale.
- Input Resistance: 15 Megohms,t L5% ncluding 100K isolatingresistor in probe.
- Normal Mode Rejection: Better than 46 dB @ 60 Hz for !2% accuracychange.
- AC VOLTS:
- 1 0 R MS R a n g e s : 50mV , l 50mv, 500mV , 1.5V , 5V , 15V ,50V , 150V , 500V and 1500V full scale.
- 10 Peak-to-Peak Ranges: l40mv, 44OmV, 1.4V, 4.4V, 14V, 44V, 140V, 44OV,1400V and 4400V full scale.
- Input Impedance: Megohms shunted by approximately 4lpf at !0.9 – input jacks.(la0pf with PR-21Probe).
- Frequencv Response: i i3B. ?H'rfr?SlHiiil;$" t 3dB; 5Hz to 20kHzover 150V
- Accuracy: !3% full scale@ 60H2, x5% on 500V and 1500Vranges.
- CommonMode Reiection: Better than 40 dB @ 60H2.
- OHMSMEASUREMENT:
- 8 Low VoltageRanges RX0.1, RXl, RX10, RX100, RX1K, RXIOK, (33mV): RX100K,RX1M.
- 7 NormalVoltageRanges RXl, RX10, RX100, RXIK, RX10K, RX100K, (1.25V): RXIM.
- MidscaleReading: 10(timesmultiplier)
- Accuracy: t3o of arc,(14" of arcon RX0.1andRX1Mranges).
- DC CURRENT:
- l0 Ranges: 50pA,150pA,500!rA,l.5mA, 5mA, 15mA,50mA, 150mA,500mAand 1.5AmPfull scale.
- Accuracy: !4% on 1.5Amp Range. t3% full scale;
- Internal VoltageDrop: 5OmV at instrument input terminals,to 50mA range.
- AC CURRENT:
- l0 Ranges: SQ.1A,l50trtA, 500prA,1.5mA, 5mA, 15mA, 50mA, 150mA, 500mA, and 1.5 AmP full scale-
- Accuracy: !4% full scale@ 60tlz, t5% on 50!tA and 1.5 amp ranges.
- Internal VoltageDrop: 50mV, at instrumentinput terminals,to 50mA range.
- FrequencyResponse: +.5d8, 2011z. to 5kHz, 500uA to 150m
Controls & Indicators
The front-panel controls and indicators for the B & K Model 290 Electronic Multimeter include:
1. Meter Zero Adjust (Mechanical): A slot located in the center of the front panel below the meter face for mechanical zero adjustment using a screwdriver.
2. Function Switch: Used to select the desired function for measurements.
3. Range Switch: Used to select 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 position the pointer at zero on the meter scale. Push the shaft in to turn the meter off.
5. Ohms Control: Adjusted with the FUNCTION switch in one of the OHMS positions and test leads open, to achieve a full scale indication on the ohms scale.
6. Probe Switch: Equipped with a shielded test lead for accurate AC measurements. In the 100K position, a 100K resistor is in series with the test lead for DC voltage measurements. Set to DIRECT for other measurements.
7. Adjustable Handle: Used to support the instrument in a sloping position for easy viewing, or placed in vertical or horizontal positions.
Installation / Setup
Refer to the PDF for details.
Operation
The manual provides a description of the operating controls for the B & K Model 290 Electronic Multimeter. It includes instructions for adjusting the mechanical meter zero before turning on the instrument, using the function switch to select the desired measurement function, and using the range switch to select the range of current, voltage, or resistance to be measured. The off-on switch and zero control are used to turn the meter on and adjust the pointer to zero. The ohms control is adjusted with the function switch in one of the ohms positions for a full-scale indication. The probe switch allows for accurate AC measurements by isolating cable capacity from the circuit under test when making DC voltage measurements. The adjustable handle can support the instrument in a convenient position for viewing.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download 3 Service manual (PDF – 2.9 MB)
Service manual for Bk-precision-290 Model 3. Provides instructions for troubleshooting, calibration, and assembly. File size: 2.9 MB.
- Brand: Bk-precision-290-instruction-service-manual
- Model: 3
- Type: Service manual
- File size: 2.9 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 3 service manual (PDF)
Bk-precision-290 Instruction Service Manual Overview
The Bk-precision-290 is a versatile and reliable piece of test equipment designed for precise electrical measurements and diagnostics. Ideal for technicians, engineers, and hobbyists, this device offers accurate readings and robust performance in various electronic testing applications. The service manual provides detailed instructions for operation, maintenance, and troubleshooting to ensure optimal functionality and longevity of the equipment.
Main Features and Specifications
- Wide measurement range including voltage, current, and resistance
- High accuracy with digital display readout
- Compact and durable design suitable for field and lab use
- Multiple measurement modes including AC/DC voltage and current
- Overload protection to safeguard internal components
- Battery-powered operation with low power consumption
- Easy-to-use interface with clear control layout
Basic Usage and Operation Tips
Before using the Bk-precision-290, ensure the device is properly calibrated according to the service manual instructions. Always start measurements at the highest range and gradually decrease to avoid damage. Connect test leads securely to the terminals and verify polarity when measuring DC signals. Use the mode selector switch to choose the appropriate measurement type. Allow the device to warm up for a few minutes for stable readings. Regularly check the battery status and replace batteries as needed to maintain accuracy.
Troubleshooting and Maintenance Notes
If the device displays erratic readings or fails to power on, check the battery condition and replace if necessary. Inspect test leads for any damage or wear and replace faulty cables. Clean the device exterior with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. Refer to the manual’s troubleshooting section for error codes and detailed repair instructions. Periodic calibration by a qualified technician is recommended to maintain measurement precision.
Safety Reminder
Always follow proper safety protocols when using the Bk-precision-290. Avoid contact with live circuits and use insulated test leads to prevent electric shock. Disconnect power sources before connecting or disconnecting the device. Never exceed the specified input limits to prevent damage or injury. Store the device in a safe, dry place when not in use, and keep the manual handy for reference to ensure safe and effective operation.