The Sencore PR47 UHF Frequency Prescaler manual provides detailed instructions on setting up and operating the device, which extends the frequency counting range to 600 MHz by dividing the input frequency by ten. It includes guidance on connecting the PR47 to various frequency counters, using the supplied RF Pick-Up Loop for signal measurement, and troubleshooting potential issues related to input sensitivity and circuit loading.
Manual Overview
The Sencore PR47 UHF Frequency Prescaler extends the frequency counting range of compatible counters to 600 MHz by dividing the input frequency by ten. It operates on 9 Volts DC from the Sencore FC45 Frequency Counter or an optional PA202 AC Power Adapter. The PR47 features a 50 Ohm input impedance and is protected against overloads with specific power limits across its frequency range. For optimal performance, the supplied PL207 RF Pick-Up Loop is recommended to avoid circuit loading and input stage damage. Troubleshooting involves ensuring proper connections and observing input voltage limits to prevent saturation. Calibration requires setting the frequency counter to read between 100 KHz and 60 MHz, then multiplying the reading by ten for the actual input frequency. The PR47’s accuracy depends solely on the frequency counter’s precision, as it does not alter the counter’s error rate. Proper use of the PR47 involves connecting it correctly to the power source and frequency counter, and using the pick-up loop for signal tracing and measurement.
Quick Issues Covered
- Diagnose power-up failures with voltage range specifications.
- Calibrate input sensitivity for accurate frequency measurement.
- Trace circuits using PL207 RF Pick-Up Loop and schematics.
Overview
The PR47 is a frequency prescaler designed to extend the counting range of frequency counters from 100 KHz-60 MHz to 600 MHz by dividing the input frequency by ten. It operates from 9 Volts DC, supplied either by the Sencore FC45 Frequency Counter or an optional AC power adapter. The PR47 features a 50 Ohm input termination to prevent impedance mismatch and comes with an RF Pick-Up Loop for inductive coupling of signals. The manual covers its operation, connection to frequency counters, and signal connections, emphasizing the use of the supplied pick-up loop to prevent circuit loading and input stage damage.
Specifications
- ACCURACY: Does not change percent error of counter.
- INPUT IMPEDANCE: 50 Ohms
- INPUT PROTECTION: 1MHz-400 MHz 1 Watt (7 Volts RMS), 400 MHz-500 MHz % Watt (5 Volts RMS), 500 MHz-600 MHz % Watt (3.5 Volts RMS)
- INPUT SENSITIVITY: 1MHz-450 MHz 2 mW (325 mV) average, 450 MHz-600 MHz 1 mW (225 mV) average
- OUTPUT VOLTAGE: 1 Volt P-P
- OUTPUT FREQUENCY: Input frequency divided by 10.
- POWER REQUIREMENTS: 7-12 VDC @ 100-150 mA supplied by 9V output of Sencore FC45 or PA202
- ACCESSORIES: SUPPLIED: PL207 RF Pick-Up Loop, 39G116 DC Power Cord, OPTIONAL: PA202 AC Power Adapter (Not required when used with Sencore FC45.)
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The setup of the PR47 frequency prescaler involves connecting it to a frequency counter. It operates from a 7 to 12 VDC power source, typically supplied by the Sencore FC45’s 9-Volt output jack or an optional PA202 AC Power Adapter for other counters. The PR47 includes a 50 Ohm input impedance and is supplied with a PL207 RF Pick-Up Loop for inductive coupling, which prevents circuit loading and protects the input from overload. When connecting to the Sencore FC45, use the supplied power cord and connect the PR47’s output to the FC45’s 1 Meg input jack. For other counters, use the PA202 adapter and connect the PR47’s output to the counter’s input jack, preferably the 1 Meg input if available. The PL207 Pick-Up Loop should be connected to the PR47’s input jack and positioned near the circuit component to be tested.
Operation
The PR47 is designed to extend the counting range of a frequency counter to 600 MHz by dividing the input frequency by ten. It operates from 9 Volts DC supplied by the Sencore FC45 Frequency Counter or an optional AC Power Adapter. The input is terminated in 50 Ohms to prevent cable ringing. The PR47 comes with an RF Pick-Up Loop for inductive coupling of signals.
To connect the PR47 to the Sencore FC45, use the supplied power connector plug and connect the output lead to the 1 Meg input jack of the FC45. Power is supplied by turning on the FC45 power switch. For other counters, use the optional PA202 AC Power Adapter and connect the signal output cable to the frequency counter input jack.
The PR47 input is rated at 1 Watt to 400 MHz and derated to 0.25 Watts at 600 MHz. It is recommended to use the supplied RF Pick-Up Loop to prevent overload. The PR47 divides the input frequency by ten, and the resulting output frequency is 100 KHz-60 MHz. To determine the input frequency, multiply the counter reading by ten.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
The manual contains a safety warning regarding the input termination of the PR47. It states that the 50 Ohm input termination is rated at 1 Watt up to 400 MHz and derated to 0.25 Watts at 600 MHz. To prevent possible damage to the PR47 input stage, it is advised to always use the supplied PL207 Pick-Up Loop instead of a direct connection when measuring high-level signals or transmitter output signals.
Download MANUAL Service manual (PDF – 2.9 MB)
Service manual for Sencore PR47 600MHz UHF Frequency Prescaler; assists in troubleshooting and calibrating device operations. PDF size: 2.9 MB.
- Brand: Sencore-pr47-600mhz-uhf-frequency-prescaler-operation-service
- Model: MANUAL
- 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 MANUAL service manual (PDF)
Sencore PR47 600MHz UHF Frequency Prescaler Overview
The Sencore PR47 600MHz UHF Frequency Prescaler is a precision electronic device designed to accurately divide high-frequency signals for measurement and analysis. Primarily used in RF testing and signal processing applications, this frequency prescaler enables technicians and engineers to extend the frequency range of standard frequency counters and test equipment by scaling down UHF signals up to 600 MHz. This enhances measurement accuracy and simplifies frequency monitoring in communication, broadcasting, and electronic development environments.
Main Features and Specifications
- Frequency range: DC to 600 MHz
- High-speed frequency division for UHF signals
- Low input sensitivity for accurate signal detection
- TTL compatible output for easy interfacing with counters and logic devices
- Compact and robust design for reliable field and lab use
- Low power consumption
- Wide operating temperature range
Basic Usage and Operation Tips
To operate the Sencore PR47 frequency prescaler, connect the input signal source to the device’s RF input terminal. Ensure the input signal amplitude meets the recommended sensitivity requirements to avoid measurement errors. The prescaler outputs a divided frequency signal compatible with standard frequency counters or logic analyzers. Use shielded cables to minimize interference and maintain signal integrity. Always power the device according to the manufacturer’s specifications and allow a brief warm-up period for optimal performance.
Troubleshooting and Maintenance
If the device fails to output a divided signal, verify that the input frequency is within the specified range and that connections are secure. Check the power supply voltage and polarity. Inspect cables for damage or wear. Regularly clean connectors and ensure the device is free from dust and moisture. If performance issues persist, consult the service manual for detailed diagnostic procedures or contact authorized service centers.
Safety Reminder
Always handle the Sencore PR47 frequency prescaler with care. Avoid exposure to excessive moisture or extreme temperatures. Disconnect power before performing any maintenance or inspection. Use proper grounding and follow standard ESD precautions to prevent damage to sensitive components. Adhering to safety guidelines ensures reliable operation and extends the lifespan of your equipment.