The Sencore FE149 Senior Field Effect Meter manual provides detailed instructions for setting up, operating, and troubleshooting the device, including a schematic, parts list, and trouble chart for repairs. It emphasizes safety precautions, battery maintenance, and offers guidance on measuring various electrical parameters such as DC and AC volts, ohms, and current.
Manual Overview
The Sencore FE149 Senior Field Effect Meter service manual provides comprehensive guidance for troubleshooting, diagnostics, calibration, and maintenance of the device. The manual includes a detailed trouble chart and schematic to assist technicians in identifying and resolving issues. It emphasizes the importance of maintaining battery health, as low battery voltage can affect meter readings. Calibration procedures are outlined to ensure accurate measurements, with specific instructions for adjusting the ohms scale using the OHMS ADJ feature. The manual also details the function and range selection via push button switches, allowing for precise measurements across various ranges of voltage, current, and resistance. Safety precautions are highlighted to prevent electrical hazards during operation. For board-level repairs, the manual provides a parts list and PC board layouts. Error diagnostics are supported by the schematic diagram, which aids in pinpointing defective components. The manual advises sending the meter to the factory service department for out-of-warranty repairs and includes contact information for ordering replacement parts.
Quick Issues Covered
- Diagnose power-up failures due to low battery voltage.
- Calibrate FE149 for accurate voltage and resistance readings.
- Use schematics for circuit tracing and troubleshooting.
Overview
The Sencore FE149 Senior Field Effect Meter is a versatile electronic maintenance tool designed for the electronics industry. It combines the features of VITVM and VOM meters with push-button ease, offering high input impedance on AC and DC ranges, peak-to-peak AC measurements, and zero warm-up time. The FE149 is suitable for various applications, including solid-state servicing and general testing, with features such as zero center DC ranges, DB ranges for audio work, and mirrored scale for accuracy. It is protected from overloads and accidental voltage application, constructed with all-steel for durability, and can be powered by battery, AC line, or while charging. The manual includes safety precautions, specifications, and instructions for operating the meter, reading different measurements, and maintaining the device.
Specifications
- High input impedance on both AC and DC voltage ranges of 15 megohms
- Push button range and function selection for ease and speed
- True peak to peak on AC ranges
- Zero center DC ranges for solid state servicing
- DC and AC current ranges for general testing
- DB ranges for audio and lab work
- Mirrored scale meter for greatest accuracy in readings
- Meter protected from overloads
- Circuits protected from accidental application of wrong voltages
- All steel construction for greater durability
- 3-way power; battery, AC line, or AC line while charging the battery
- DC VOLTS
- Ranges: 0 to .5, 1.5, 5, 50, 150, 500, 1500 full scale
- -.25 to .25, -.75 to .75, -2.5 to 2.5, -7.5 to 7.5, -25 to 25, -75 to 75, -250 to 250, and -750 to 750 ZERO CENTER RANGES
- Input Resistance: 15 megohms shunted by 45 pf
- Accuracy: + 1.5%
- AC Rejection: 30 db
- AC VOLTS
- Ranges: RMS
- 0 to .5, 1.5, 5, 15, 50, 150, 500, and 1500 full scale
- Ranges: Peak to Peak
- 0 to 1.4, 4.5, 14, 45, 140, 450, 1400, and 4500 full scale frequency compensated
- Input Resistance: 15 megohms shunted by 125 pf
- Frequency Response: Flat: 25Hz to 1 MHz
- 3 db points 8 Hz to over 8 MHz
- Accuracy: + 3%
- OHMMETER
- Ranges: 0 to 600 ohms, 6,000, 60K, 600K, 6 meg, 60 meg, 600 meg, and 6,000 megs
- Accuracy: + 1 1/2 degree arc
- DC CURRENT MEASUREMENTS
- Ranges: 0 to 150 microamps, 500 microamps, 1.5 Ma, 5 Ma, 15 Ma, 50 Ma, 150 Ma, and 500 Ma
- 5 amps thru special jack on front panel
- Accuracy: + 3% full scale
- Internal Voltage Drop: 300 MV on 150 Microamp to 15 Ma; 340 MV on 50 Ma, 425 MV on 150 Ma, and 720 MV on 500 Ma, 880 MV at 5 Amp Jack
- AC CURRENT MEASUREMENTS
- Ranges: 0 to 150 microamps, 500 microamps, 1.5 Ma, 5 Ma, 15 Ma, 50 Ma, 150 Ma, and 500 Ma
- 5 amps thru special jack on front panel
- Accuracy: + 3% full scale
- Internal Voltage Drop: 300 MV on 150 Microamp to 15 Ma; 340 MV on 50 Ma
Controls & Indicators
The front-panel controls/indicators of the FE149 include an EFFECT METER, FUNCTION SWITCH, and RANGE SWITCH. The FUNCTION SWITCH is a push button switch used to select the desired function for measurements, such as plus or minus DC volts, AC volts, Ohms, BATT check, plus or minus DC current, or AC current, totaling 8 functions. The RANGE SWITCH is also a push button switch that selects the desired range of current, voltage, or resistance to be measured, with a total of 8 different ranges available.
Installation / Setup
Refer to the PDF for details.
Operation
The Sencore FE149 Senior Field Effect Meter is designed for ease of operation. To use the meter, the user should select the desired function by pressing the appropriate button on the FUNCTION switch, and then select the desired range by pressing the corresponding button on the RANGE switch. Once the function and range are set, the user can connect the leads and read the results on the meter. For reading DC volts, the user should press either the minus DC or plus DC button on the FUNCTION switch.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
When testing electronic equipment, there are several safety precautions to observe:
1. Use an isolation transformer on equipment with a chassis tied to one side of the AC power line.
2. Remove power when making test lead connections to high voltage points. If power cannot be removed, avoid contact with other equipment or metal objects, place one hand in your pocket, and stand on an insulated floor to reduce shock risk.
3. Discharge filter capacitors before connecting test leads, as they can store a dangerous charge.
4. Ensure equipment is in good condition; broken or frayed test leads can expose the technician to dangerous potentials.
5. Remove test leads immediately after testing to reduce shock risk.
6. Do not work alone on hazardous circuits; have another person nearby in case of an accident. Even minor shocks can lead to more serious accidents.
Download MANUAL Service manual (PDF – 1018.8 KB)
Service manual PDF for Sencore FE149 Senior Field Effect Meter. Guides technicians in troubleshooting and calibrating the device.
- Brand: Sencore-fe149-senior-field-effect-meter-operation-service
- Model: MANUAL
- Type: Service manual
- File size: 1018.8 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
Download MANUAL service manual (PDF)
Sencore FE149 Senior Field Effect Meter Overview
The Sencore FE149 Senior Field Effect Meter is a precision instrument designed to measure and analyze field effect transistor (FET) parameters. Widely used in electronics servicing and testing, this meter provides accurate readings essential for diagnosing and servicing semiconductor devices. Its robust design and reliable performance make it a valuable tool for technicians working with FETs in various electronic circuits.
Main Features and Specifications
- Accurate measurement of FET parameters including gate threshold voltage and leakage currents
- Wide operating frequency range suitable for diverse transistor types
- Clear analog display for real-time readings
- Compact and durable design for field and bench use
- Battery-powered operation for portability
- Simple calibration procedures to ensure measurement accuracy
Basic Usage and Operation Tips
To operate the Sencore FE149, first ensure the device is properly calibrated according to the manual instructions. Connect the test leads securely to the transistor terminals, observing correct polarity. Power on the meter and select the appropriate measurement mode. Allow the meter to stabilize before taking readings for best accuracy. Avoid touching the transistor leads during measurement to prevent interference. Regularly check battery levels to maintain consistent performance.
Troubleshooting and Maintenance
If the meter displays erratic or no readings, verify all connections and confirm the transistor under test is functional. Replace batteries if the display dims or readings become unstable. Clean the test leads and connectors periodically to prevent oxidation and ensure reliable contact. Store the meter in a dry, dust-free environment to prolong its lifespan. For calibration issues, refer to the service manual for detailed adjustment procedures.
Safety Reminder
Always disconnect the device from power sources before testing components to avoid electric shock. Handle the meter and test leads with care to prevent damage. Use the meter only within specified voltage and current limits to ensure safe operation. Follow all safety guidelines outlined in the manual to protect both the user and the equipment.