The manual for the Model 1870/1875 Handheld Frequency Counter provides detailed instructions on setting up the device, operating it for frequency measurements, and troubleshooting common issues such as over range indicators and battery replacement. It includes descriptions of the front panel controls, measurement procedures for different frequency ranges, and guidelines for using optional accessories like the telescoping antenna for enhanced frequency detection.
Manual Overview
The Bk Model 1870/1875 Handheld Frequency Counter manual provides detailed guidance on the device’s operation, focusing on troubleshooting, error codes, calibration, and board-level instructions. Troubleshooting involves checking the power supply and ensuring correct input connections. The device displays error codes for over-range conditions, which are indicated by the “Over Range Indicator.” Calibration is achieved through the use of a 4.194 MHz quartz crystal time base, ensuring high accuracy with a frequency accuracy of +(4 PPM +1 d) at 23°C. Adjustments can be made using the Gate Time and Sensitivity selectors to optimize resolution and sampling time. The manual specifies using different BNC sockets for input based on frequency range: Channel A for 100 MHz to 2600 MHz, Channel B for 5 MHz to 100 MHz, and Channel C for up to 10 MHz. The device supports data hold and relative measurement functions, which can be activated via dedicated buttons on the front panel. For frequencies above 500 MHz, the RF pick-up antenna is recommended for optimal sensitivity.
Quick Issues Covered
- Diagnose power-up failures using power ON/OFF button functions.
- Identify error codes with display and gate time indicators.
- Use schematics for circuit tracing via BNC input sockets.
Overview
The Model 1870/1875 Handheld Frequency Counter is a portable, pocket-sized instrument designed for high sensitivity VHF and UHF frequency measurements, with a wide measuring range up to 2.6 GHz. It features a microprocessor IC for intelligent functions such as frequency, period, multi-resolution, data hold, relative measurement, and data record. The device includes an LCD display for low power consumption and clear readouts, and it operates with a low PPM crystal time base for high accuracy. The manual covers features, specifications, front panel descriptions, 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)
- 100 MHz 5 MHz to 120 MHz
- 10 MHz 10 Hz to 10 MHz
- Period 10 Hz to 10 MHz
- Sensitivity 2500 MHz 50 MHz — 75 MHz <= 100 mV (rms) range 76 MHz — 2500 MHz <= 50 mV
- 100 MHz 5 MHz— 100 MHz < 50 mV range > 100MHz to 120MHz = 100 mV
- 10 MHz <= 50 mV
- 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
- 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
- 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
- PB~21 Direct probe with BNC connector & alligator clip pair (Be used only for the measuring frequency < 500 MHz)
- 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 manual provides the following basic usage steps for operating the Model 1870/1875 Handheld Frequency Counter:
1. Frequency Measurement:
– Turn on the device by pressing the Power On button.
– Select the appropriate range using the Range Selector based on the frequency to be measured.
– Connect the measured signal to the correct input BNC socket depending on the frequency range.
– Adjust the Sensitivity Selector to “HIGH” or “LOW” for frequencies within 10 MHz.
– Choose the Gate Time Selector position (“FAST” or “SLOW”) to set the desired Sampling Time and Resolution.
– Note that the display unit varies: MHz for 100 & 2500 MHz range, and Hz for 10 MHz range.
2. Data Hold Measurement:
– During measurement, press the HOLD button to freeze the display values. Pressing the HOLD button again will release the hold function.
3. Relative Measurement:
– Press the REL. button to memorize the last measured values, which will reset the display to “0” and show a “REL” marker.
These steps outline the basic operation modes and usage of the frequency counter as described in the manual.
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-1870-instruction manual: troubleshoot and calibrate equipment efficiently. File size: 278.0 KB.
- Brand: Bk-precision-1870-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-1870-instruction Overview
The Bk-precision-1870 is a versatile digital multimeter designed for precise electrical measurements in both professional and hobbyist environments. This device allows users to accurately measure voltage, current, resistance, and continuity, making it an essential tool for troubleshooting electrical circuits, testing components, and verifying system performance.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD for easy reading in low-light conditions
- Accuracy: High precision with auto and manual ranging options
- Input Protection: Overload protection to safeguard the device and user
- Data Hold Function: Freeze measurement readings for convenience
- Auto Power Off: Conserves battery life when not in use
- Compact and Lightweight: Portable design for field and lab use
Basic Usage and Operation Tips
Before use, ensure the multimeter is set to the correct measurement mode and range for your application. Connect the test leads securely to the device and the circuit under test. For voltage measurements, connect leads in parallel; for current, connect in series. Use the data hold feature to capture readings when working in hard-to-see locations. Always start with the highest range to prevent damage, then adjust downward for more precise readings.
Troubleshooting and Maintenance
If the multimeter displays erratic readings or no display at all, check the battery and replace it if necessary. Inspect test leads for damage or wear, and replace if faulty. Clean the device regularly with a soft, dry cloth; avoid using solvents. If the device fails to power on or shows persistent errors, consult the manual or contact authorized service centers for repair.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1870. Do not exceed the specified input limits to avoid electric shock or damage. Use insulated test leads and avoid working on live circuits without proper protective equipment. Disconnect power before making resistance or continuity measurements. Follow all local electrical safety regulations to ensure safe operation.