The B&K-PRECISION Model 1820 manual provides detailed instructions on setting up, operating, and troubleshooting the 80 MHz Universal Counter, including descriptions of panel controls, display interpretation, and recalibration procedures. It also covers specifications, internal and external time base options, and maintenance tips to ensure accurate frequency and period measurements.
Manual Overview
The B&K Precision Model 1820 Universal Counter is a versatile frequency counter capable of measuring frequencies from 5 Hz to 80 MHz. It features an autoranging function and can measure period, accumulated cycles, and time. The device uses a 10 MHz crystal-controlled oscillator as its internal time base, with an option to use an external time base via a BNC connector. The counter’s display includes six seven-segment LEDs and indicators for KHz/uS, MHz/mS, and overrange conditions. Troubleshooting involves checking the function pushbutton switches and ensuring the correct gate interval is selected. Error diagnostics are aided by the flashing “OVER” indicator for overrange conditions. Calibration and adjustments are facilitated by the internal time base’s high accuracy and stability. The manual provides guidance on board-level operations, including the use of the X1/X10 attenuator switch and the optional Temperature Compensated Crystal Oscillator (TCXO) for enhanced stability. The counter is designed for minimal source loading with a standard input impedance of one megohm, making it suitable for various applications.
Quick Issues Covered
- Diagnose power-up failures with internal/external time base selection.
- Error codes for overrange indicated by flashing LED.
- Schematics assist in circuit tracing and troubleshooting.
Overview
The B & K-PRECISION Model 1820 is an 80 MHz Universal Counter produced by DYNASCAN CORPORATION. It is a high-quality, lightweight, autoranging frequency counter capable of measuring frequencies from 5 Hz to 80 MHz. The device can also measure the period for one cycle, accumulated cycles, and time. The counter’s functions are controlled by four pushbutton switches on the front panel, and it features a six-digit LED display with indicators for KHz/uS, MHz/mS, and overrange. The Model 1820 includes an internal 10 MHz crystal-controlled oscillator, with the option to use an external time base. It is designed for use by scientists, engineers, experimenters, hobbyists, and service technicians, offering ruggedness, compactness, and low power consumption. The manual covers specifications, operation, theory of operation, recalibration, maintenance, and warranty instructions.
Specifications
- FREQUENCY CHARACTERISTICS
- Range 5 Hz to 80 MHz, FUNCTION switch selects KHz or AUTO display reading.
- Gate Time, AUTO 10mS (MHz reading) 100mS and 1 SEC (KHz reading), automatically determined by counter circuitry.
- Gate Time, 1 SEC 1 second (KHz reading — 1Hz resolution).
- Accuracy + Time base accuracy, +1 count.
- Resolution +,0001% (1 PPM on 6 digit scale on all ranges). 1Hz resolution when 1 SEC gate is used.
- Display Input signal frequency with decimal point positioned automatically. Units of measurement (KHz, MHz) indicated on front panel by LED indicator.
- PERIOD CHARACTERISTICS
- Period Average. AUTO 1 period average (mS), 10 and 100 period average (uS).
- Period Average, 1 SEC 100 period average (uSEC reading with 1 nS resolution).
- Internal Frequency Counted 10 MHz.
- Minimum Period Pulse Width 200 nS or greater pulse width required to trigger period counting circuitry.
- Accuracy Trigger Uncertainty + Time Base Accuracy +1LSD
- Periods Average Display Input signal period with automatically positioned decimal point. Units of measurement (mSEC or USEC) displayed on front panel by LED indicators.
- Overrange Flashing OVER indicator.
- INPUT CHARACTERISTICS
- Impedance 1 megohm resistance shunted by 25 pF capacitance.
- Connector BNC on front panel.
- Coupling AC.
- Sinewave Sensitivity 30 mV RMS, 5 Hz to 40 MHz.
- 50 mV at 80 MHz (see Fig. 2).
- Maximum Input 200V (DCtpeak AC), DC to 500 Hz, decreasing linearly to 100V (DCtpeak AC) at 1 KHz.
- 100V (DCt+peak AC), 1 KHz to 5 MHz, decreasing linearly to 30V (DCtpeak AC) at 80 MHz, See Fig. 1.
- Attenuator X1/X10 switch-selectable.
- INTERNAL TIME BASE CHARACTERISTICS
- (REFERENCED TO 25°C AFTER HALF-HOUR WARMUP)
- Type Crystal oscillator.
- Frequency 10 MHz.
- Setability +.1 PPM (+1 Hz).
- Line Voltage Stability ‘Less than +1 PPM with +10% line voltage variation.
- Temperature Stability Less than +0.001% (+10 PPM from O°C to 50°C ambient).
- Maximum Aging Rate +10 PPM/YR; +1 PPM/MO.
- External Input TTL Level: 2.5V P-P, switch-selectable.
- ACCUMULATE CHARACTERISTICS
- Capacity 0 to 999999 plus overflow.
- Control Manual reset to 0. Provision included for conversion to remote reset by user.
- ELAPSED TIME
- Range .01 SEC to 9999.99 SEC. = 166.66 minutes = 2.777 hours, plus overrange.
- Display Positioned decimal point.
- Accuracy + Time base accuracy, + trigger error +1 count.
- Trigger Input Rear panel connector compatible with either TTL or contact closure, trigger is activated on rising or falling edge of signal.
- Reset Manual RESET switch on front panel.
- DISPLAY CHARACTERISTICS
- Visual Display 6 digits with overflow. KHz/uS, MHz/mS indicator.
- Leading zero blanking, decimal point automatically positioned.
- Overrange Indication Flashing LED indicates
Controls & Indicators
The front panel of the Model 1820 Universal Counter includes four FUNCTION pushbutton switches for selecting the counter’s functions, a RESET pushbutton for resetting the display to zero, an AUTO/1 SEC switch for selecting the gate interval, and an X1/X10 switch for input signal attenuation. The display consists of six seven-segment LED numerical units and three LEDs to indicate KHz/uS, MHz/mS, and OVER (overrange).
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
Refer to the PDF for details.
Download MANUAL Service manual (PDF – 13.3 MB)
Bk-precision-1820-instruction-service manual: troubleshoot, calibrate, and service the 1820 model. File size: 13.3 MB.
- Brand: Bk-precision-1820-instruction-service
- Model: MANUAL
- Type: Service manual
- File size: 13.3 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-1820-instruction-service MANUAL Overview
The Bk-precision-1820 is a versatile and reliable piece of test equipment designed for precise electrical measurements and diagnostics. Ideal for both professional technicians and electronics enthusiasts, this device provides accurate voltage, current, and resistance readings, making it essential for troubleshooting and servicing electronic circuits and components.
Main Features and Specifications
- Wide measurement range for voltage, current, and resistance
- High accuracy with digital display readout
- Auto-ranging capability for ease of use
- Data hold function to freeze readings on the display
- Compact and durable design for field and lab use
- Overload protection to prevent damage to the device
- Battery-powered for portability
Basic Usage and Operation Tips
Before using the Bk-precision-1820, ensure the device is properly calibrated and the batteries are fully charged. Select the appropriate measurement mode and range based on the parameter you intend to measure. Connect the test leads securely to the circuit or component under test. Use the data hold function to capture stable readings when needed. Always start with the highest range to prevent damage to the device and switch to lower ranges for more precise measurements.
Troubleshooting and Maintenance
If the device fails to power on, check the battery condition and replace if necessary. In case of erratic readings, verify the test leads for damage or poor connections. Clean the device regularly with a dry cloth and avoid exposure to moisture or extreme temperatures. For persistent issues, refer to the service manual for detailed diagnostic procedures and authorized repair instructions.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1820. Avoid contact with live circuits when measuring high voltages, and never exceed the specified input limits. Use insulated test leads and wear appropriate personal protective equipment to minimize the risk of electric shock or injury.