The Sencore FE20 Hi-Lo Meter service manual provides detailed instructions for setting up, operating, and troubleshooting the meter, including safety precautions, battery installation, and measuring various electrical parameters such as DC and AC voltage, current, and resistance. It also includes a trouble chart, circuit descriptions, and calibration instructions to ensure accurate and safe use of the device.
Manual Overview
The Sencore FE20 HI-LO Meter service manual provides detailed guidance on operation, troubleshooting, and maintenance of the device. It emphasizes safety precautions, such as using an isolation transformer and avoiding contact with high voltage points. The manual includes a troubleshooting flowchart to diagnose common issues, providing systematic steps to identify and resolve errors. Error codes and diagnostics are not explicitly detailed but are implied through the troubleshooting procedures.
Calibration and adjustments are crucial for accurate measurements, with specific instructions for calibrating the HI-LO meter and constructing a meter calibrator. The manual provides board-level guidance, including a schematic and parts list, to assist in component-level troubleshooting and repair. The FE20 features high input impedance, true peak-to-peak AC ranges, and zero-center ranges for DC measurements, making it suitable for solid-state servicing. The manual also covers the use of shielded test leads and probes, ensuring accurate readings in environments with strong electromagnetic fields. Overall, it serves as a comprehensive resource for technicians to effectively operate and maintain the FE20 HI-LO Meter.
Quick Issues Covered
- Diagnose power-up failures with detailed troubleshooting chart.
- Calibrate the HI-LO meter using step-by-step instructions.
- Trace circuits with provided schematic and parts list.
Overview
The Sencore FE20 HI-LO Field Effect Meter is designed to meet the requirements of servicing solid state and integrated circuits. It features high input impedance on all AC and DC ranges, true peak-to-peak AC ranges, zero center ranges for DC, a dB scale for audio and lab work, and low power ohms ranges for accurate resistance measurements. The meter is protected from overloads and accidental voltage application, housed in a durable steel carrying case, and powered by long-life “C” cell batteries. The manual covers safety precautions, specifications, operation, circuit description, maintenance, and troubleshooting.
Specifications
- DC VOLTS
- Ranges: 0 to .1, .3, 1, 3, 10, 30, 100, 300, and 1000 full scale
- -.05 to .05, -.15 to .15, -.5 to .5, -1.5 to 1.5, -5 to 5,
- -15 to 15, -50 to 50, -150 to 150, and -500 to 500 Zero
- Center Scale Ranges.
- Input Resistance: 15 megohms shunted by 90 pf in probe "NORM"
- position; or shunted by 10 pf in probe "120K ISOLATION"
- position.
- Accuracy: +1.5%
- AC Rejection: 30 db Minimum
- AC VOLTS
- Ranges: (RMS)
- Oto.1, .3, 1, 3, 10, 30, 100, 300, and 1000 Full scale
- Ranges: (Peak to Peak)
- 0 to .28, .84, 2.8, 8.4, 28, 84, 280, 840, and 2800 Full scale
- Input Resistance: 12 Megohms shunted by 90 pf
- Frequency Response: 1 db 10 Hz – 150 KHz
- 3 db 5 Hz – 500 KHz
- OHMMETER
- Ranges: HI & LO POWER
- 0 to 1000 ohms, 10K, 100K, 1 Meg, 10 Meg, 100 Meg, and
- 1000 Meg with 12 ohms center scale
- Accuracy: + 2 degrees ARC
- Applied Voltage: Hi Power 1.5 Volts
- Lo Power’ .08 Volts
- DC CURRENT MEASUREMENTS:
- Ranges: 0 to 100 microamps, 300 microamps, 1 mA, 3 mA, 10 mA,
- 30 mA, 100 mA, 300 mA, and 1 amp.
- Accuracy: + 3% full scale
- Internal voltage drop: 80 mv on 100 microamp to 10 mA ranges,
- 100 to 900 mv on 30 mA to 1 amp ranges.
- Decibel (db)
- Ranges: -20, -10, 0, 10, 20, 30, 40, 50, and 60 db
- Reference: 1 mv into 600 ohms
- GENERAL SPECIFICATIONS:
- Meter: 6 inch, 200 microamp, 2%
- Multiplier resistors: 1/2% deposited carbon type
- Semiconductor complement:
- Transistors: 2 – 2N5457 FETs, 2 – 2N4248, 1 – 2N5172
- Diodes: 2 – 1N456, 3 – 1N695, 1 – 16S10
- Power supply: 6 each 1.5v ''C" cells Eveready #935 or equivalent
- (not supplied)
- Ohms Battery: one 1.5V "C" cell Eveready #1035 or equivalent
- (not supplied)
- Weight: (less batteries) 8 lbs.
- Dimensions: 9 1/2" High X 7 3/4" Wide
Controls & Indicators
The front panel controls on the FE20 HI-LO Meter include the RANGE switch, FUNCTION switch, meter ZERO ADJUST, OHMS ADJUST, ON-OFF switch, and the battery test switches. The RANGE switch selects the desired range of voltage, current, or resistance to be measured. The FUNCTION switch selects the type of measurement to be made, such as plus or minus DC volts or current, AC volts, HI or LO power ohms. The ZERO ADJUST is used to position the pointer of the meter over the zero at the extreme left of the meter.
Installation / Setup
Refer to the PDF for details.
Operation
The FE20 HI-LO Meter is equipped with a shielded test lead and probe to ensure accurate measurements in the presence of strong electrostatic and electromagnetic fields. The probe includes a 120K isolation resistor to isolate cable capacity during DC voltage measurements in critical circuits. The probe switch is typically left in the normal position for most readings, including DC voltage. It should only be placed in the isolate position when necessary to isolate cable capacity from the circuit being measured, as this setting results in a 0.6% low DC voltage reading. The isolate position is recommended only for DC voltage and AC voltage at 60 Hz to avoid significant errors in other functions.
The FE20 HI-LO Meter operates similarly to a standard VOM with several front panel controls: the RANGE switch, FUNCTION switch, meter ZERO ADJUST, OHMS ADJUST, ON-OFF switch, and battery test switches. The RANGE switch selects the desired range for voltage, current, or resistance measurements. The FUNCTION switch determines the type of measurement, such as plus or minus DC volts or current, AC volts, or HI or LO power ohms. The ZERO ADJUST is used to position the meter pointer over the zero at the extreme left of the meter face.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
When testing electronic equipment, there is always a danger present due to unexpected high voltages that can occur in defective equipment. Technicians should familiarize themselves with the device they are working on and observe the following precautions:
1. Use an isolation transformer on equipment with the chassis tied to one side of the AC power line.
2. Remove power when making test lead connections to high voltage points. If this cannot be done, avoid contact with other equipment or metal objects, place one hand in your pocket, and stand on an insulated floor to reduce the possibility of shock.
3. Discharge filter capacitors before connecting test leads to them, as capacitors can store a dangerous charge.
4. Ensure equipment is in good order; broken or frayed test leads can expose the technician to dangerous potentials.
5. Remove test leads immediately after completing the test to reduce the possibility of shock.
6. Do not work alone on hazardous circuits; always have another person nearby in case of an accident. Even a minor shock can cause a more serious accident, such as falling against equipment or coming into contact with higher voltages.
Download MANUAL Service manual (PDF – 2.0 MB)
Sencore FE20 Hi-Lo Meter Manual: Guide for operation, troubleshooting, and calibration. File size: 2.0 MB.
- Brand: Sencore-fe20-hi-lo-meter-operation-service
- Model: MANUAL
- Type: Service manual
- File size: 2.0 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 FE20 Hi-Lo Meter Operation & Service Manual Overview
The Sencore FE20 Hi-Lo Meter is a precision electronic test instrument designed to measure high and low voltage levels accurately in various electrical and electronic systems. This device is widely used by technicians and engineers for troubleshooting, calibration, and maintenance of electronic equipment, ensuring optimal performance and safety. The accompanying service manual provides detailed instructions for operation, maintenance, and repair, making it an essential resource for professional servicing and technical support.
Main Features and Specifications
- Dual-range voltage measurement: High and Low voltage settings for versatile applications
- High accuracy and stability for reliable readings
- Clear analog display with easy-to-read scale
- Compact and rugged design suitable for field and lab use
- Battery-powered operation for portability
- Comprehensive service and calibration instructions included
Basic Usage and Operation Tips
Before using the FE20 Hi-Lo Meter, ensure the device is properly calibrated according to the service manual guidelines. Select the appropriate voltage range (Hi or Lo) based on the expected measurement to avoid damage or inaccurate readings. Connect the test leads securely to the circuit under test, and observe the meter needle movement to interpret voltage levels. Always allow the meter to stabilize before taking a reading for best accuracy. Store the meter in a dry, dust-free environment when not in use to maintain performance.
Troubleshooting and Maintenance
If the meter displays erratic or no readings, first check the battery condition and replace if necessary. Inspect test leads and connectors for damage or corrosion. Refer to the service manual for detailed circuit diagrams and step-by-step troubleshooting procedures. Regular calibration is recommended to maintain accuracy. Clean the meter casing with a soft, dry cloth and avoid exposure to extreme temperatures or moisture to prolong device lifespan.
Safety Reminder
Always observe proper safety precautions when working with electrical equipment. Do not exceed the maximum voltage ratings specified in the manual. Use insulated test leads and wear appropriate personal protective equipment. Disconnect power sources before opening the meter for service or repair. Following these safety guidelines helps prevent electric shock, equipment damage, and ensures safe operation.