The manual for the Model 1870/1875 Handheld Frequency Counter provides detailed instructions on setting up the device, operating it for frequency measurement, and utilizing features such as data hold, relative measurement, and data recording. It also includes troubleshooting guidance for issues like over-range indications and battery replacement, ensuring users can effectively manage the device's performance and maintenance.
Manual Overview
The Bk Model 1870/1875 Handheld Frequency Counter manual focuses on troubleshooting, diagnostics, and calibration. For troubleshooting, the manual emphasizes using the Range Selector and Sensitivity Selector to ensure accurate measurements, advising users to select appropriate ranges for high sensitivity and resolution. Error diagnostics involve monitoring the display for random values or error indicators, such as the “— — HoLd — —” message during Data Hold Measurement. Calibration involves adjusting the Gate Time Selector for optimal sampling time and resolution, with specific instructions for using the RESO. button to cycle through different settings. The manual provides board-level guidance by detailing the use of BNC sockets for input signals across various frequency ranges and highlights the importance of using the correct input method, such as the RF PICK UP antenna for frequencies above 500 MHz. Additionally, it outlines the procedure for Data Hold and Relative Measurement, ensuring technicians can accurately capture and compare frequency data.
Quick Issues Covered
- Diagnose power-up failures using power ON/OFF button checks.
- Resolve frequency measurement errors with range and sensitivity selectors.
- Use schematics for circuit tracing via input BNC sockets.
Overview
The Model 1870/1875 Handheld Frequency Counter is a portable device designed for measuring frequencies with high sensitivity, particularly useful for VHF and UHF frequency measurements. It features a wide measuring range up to 2.6 GHz and offers good resolution with a minimum display unit of 0.1 Hz for the 10 MHz range. The device includes intelligent functions such as frequency, period, multi-resolution, data hold, relative measurement, and data record (max, min, average reading). It has an auto power-off feature, an LCD display for low power consumption, and uses a low PPM crystal time base for high accuracy measurement. The manual covers features, specifications, front panel description, measuring procedures, and battery replacement.
Specifications
- Display 13mm (0.5") LCD, 8 digits
- Measurement Frequency, Data hold, Relative, Memory(max., min., average), Period
- Range 2500 MHz 50 MHz to 2500 MHz (typical max. 2600 MHz)
- Range 100 MHz 5 MHz to 120 MHz
- Range 10 MHz 10 Hz to 10 MHz
- Period 10 Hz to 10 MHz
- Resolution Refer to "Table for Resolution & Sample Time"
- Sensitivity 2500 MHz 50 MHz — 75 MHz <= 100 mV (rms)
- Sensitivity 2500 MHz 76 MHz — 2500 MHz <= 50 mV
- Sensitivity 100 MHz 5 MHz— 100 MHz < 50 mV
- Sensitivity 100 MHz > 100MHz to 120MHz = 100 mV
- Sensitivity 10 MHz <= 50 mV
- Sensitivity Period < 50 mV
- Frequency Accuracy + (4 PPM +1 d), (23 + 5 °C, after calibration)
- Time Base circuit 4.194 MHz quartz crystal
- Time Base Temp. Coefficient 0.1 PPM/per °C (typical, 23 + 5 °C)
- Over-input 2500 MHz & 100 MHz range: Max. 5V peak to peak
- Over-input 10 MHz & Period range: Max. 250 V peak to peak
- Input Connector BNC, female
- Case Durable & strong ABS-plastic housing
- Operating Temp. 0°C to 50°C (32°C to 122°C)
- Operating Humidity Max. 90% RH (0 °C to 35 °C)
- Power Supply 4x 1.5 V AA(UM-8) battery
- Power Consumption 2500 MHz & 100 MHz range: Approx. DC 105 mA
- Power Consumption 10 MHz & Period range: Approx. DC 45 mA
- AC Adapter Optional, 8V DC, 300 to 500 mA rating, central positive for socket
- Power Off Automatic power off & manual power off
- Dimension 173 x 80 x 35mm (6.8 x 3.1 x 1.4 inch)
- Weight 340 g/0.75 LB (including battery)
- Standard Accessories instruction Manual: 1 PC
- Optional Accessories AT-20 Telescoping RF pick-up antenna with BNC connector
- Optional Accessories PB-21 Direct probe with BNC connector & alligator clip pair (for frequency < 500 MHz)
- Optional Accessories CA-03 Soft carrying case
Controls & Indicators
The front-panel controls and indicators for the Model 1870/1875 Handheld Frequency Counter include:
– Display
– Gate Time Indicator
– AC/DC 9V Adapter Socket
– Power ON Button
– Power OFF Button
– HOLD (Data Hold) Button
– REL. (Relative Measurement) Button
– RESO. (Resolution selecting) Button
– RECORD (Memory Record) Button
– CALL (Memory Data Call) Button
– Range Selector
– Gate Time (FAST/SLOW) Selector
– 10 MHz Sensitivity Selector
– 2500 MHz (Channel A) Input BNC Socket
– 100 MHz (Channel B) Input BNC Socket
– 10 MHz (Channel C) Input BNC Socket
– Battery Compartment/Cover
Installation / Setup
Refer to the PDF for details.
Operation
The operation of the Model 1870/1875 Handheld Frequency Counter involves several basic usage steps:
1. Frequency Measurement:
– Turn on the device using the Power On button. The display will initially show “0” or random values, indicating readiness for measurement.
– Use the Range Selector to choose the appropriate range (100 MHz, 2500 MHz, or 10 MHz) based on the measurement requirement.
– Input the signal to the correct BNC socket: Channel A for 100 MHz to 2600 MHz, Channel B for 5 MHz to 100 MHz, and Channel C for 10 MHz.
– Adjust the Sensitivity Selector to “HIGH” or “LOW” for frequencies within 10 MHz.
– Set the Gate Time Selector to “FAST” or “SLOW” to determine the Sampling Time and Resolution. For more options, press the RESO. button three times to cycle through combinations.
– Note that the display unit is MHz for 100 & 2500 MHz ranges and Hz for the 10 MHz range. The Gate Indicator will flash once for each sampling time passed.
2. Data Hold Measurement:
– During measurement, press the HOLD button to freeze the display values. The display will alternate between showing “— — HoLd — —” and the held values. Press the HOLD button again to release the hold function.
3. Relative Measurement:
– Press the REL. button during measurement to memorize the last measured value. The LCD will show “0” and a “REL” marker will appear, indicating relative measurement mode.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 278.0 KB)
Bk-precision-1875-instruction manual: assists technicians in troubleshooting and calibrating the Bk-precision 1875 model. File size: 278.0 KB.
- Brand: Bk-precision-1875-instruction
- Model: MANUAL
- Type: Manual
- File size: 278.0 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-1875-instruction Overview
The Bk-precision-1875 is a versatile digital multimeter designed for accurate measurement of electrical parameters in various applications. Ideal for both professional technicians and hobbyists, this device offers reliable readings for voltage, current, resistance, and continuity testing. Its compact design and intuitive interface make it a valuable tool for troubleshooting and diagnostics in electronics, automotive, and electrical maintenance.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for clear readings in low light conditions
- Auto-ranging capability for ease of use and accuracy
- Data Hold function to freeze readings on the display
- Overload protection on all ranges to safeguard the device
- Battery powered with low battery indicator
- Compact and lightweight design for portability
Basic Usage and Operation Tips
Before using the Bk-precision-1875, ensure the device is powered on and the correct measurement mode is selected using the rotary switch. Connect the test leads securely to the appropriate input jacks. When measuring voltage or current, always start with the highest range to prevent damage. Use the Data Hold button to capture readings for later review. After use, turn off the device to conserve battery life.
Troubleshooting and Maintenance
If the display shows erratic readings or no response, check the test leads for damage or loose connections. Replace the battery if the low battery indicator appears. Clean the device regularly with a soft, dry cloth; avoid using solvents or abrasive materials. Store the multimeter in a dry, dust-free environment to prolong its lifespan. For persistent issues, consult the detailed manual or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1875. Do not exceed the specified input limits to avoid electric shock or damage. Avoid measuring live circuits if you are unsure of the procedures. Use insulated test leads and wear protective equipment when necessary. Keep the device away from moisture and extreme temperatures to ensure safe operation.