Sencore TF151 User Manual

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MANUAL

Sencore TF151 Specifications

General

Brand	Sencore
Model	TF151
Category	Test Equipment
Language	English

Summary

Safety Precautions

Specifications

Regular Transistor Specifications

Details AC beta (hfe) measurements at 60 Hz for different ranges.

Field Effect Transistor Specifications

Details Transconductance (Gm) measurements at VDS=5V, VGS=0.

Common Transistor Terminology

TF151 Controls Overview

Selection Switches

Combines POL/MAT, BIAS, and FUNCTION switches for selecting test parameters.

Calibration and Test Buttons

Includes BETA CAL, GAIN, and IDSS buttons for testing and calibration.

Test Jacks and Connections

Transistor Chart Columns Explained

Explains columns like Transistor Number, Test Position, and Polarity/Material.

FET Reference Book Section

FET Chart Columns Explained

Details columns for FETs like FET number, Channel, Bias, IDSS, and Gm.

Testing Regular Transistors

Beta and Leakage Parameters

Explains beta (hfe) and ICBO leakage testing for bipolar transistors.

Checking Regular Transistor AC Beta

Testing Connections and Setup

Details lead connections and function/type switch settings for transistor testing.

Regular Transistor Troubleshooting Chart

Checking Regular Transistor Leakage (ICBO)

Leakage Measurement Procedure

Steps for connecting leads, setting switches, and reading leakage.

Testing Field Effect Transistors (FETs)

FET Modes of Operation

Measuring FET Transconductance (Gm)

Gm Measurement Setup and Procedure

Steps for connecting leads, setting switches, zeroing, and reading Gm.

FET Troubleshooting Chart

Checking FET Gate Leakage (IGSS)

IGSS Leakage Measurement

Steps for connecting leads, setting switches, and reading leakage.

Zero Bias Drain Current (IDSS) Testing

IDSS Impact and Example

Explains IDSS role in circuits and provides a dissipation calculation example.

Dual Gate FET Testing

Dual FETs (Matched Pairs)

MOSFET/IGFET Safety Precautions

Handling and Testing Precautions

Covers body potential, lead handling, soldering iron grounding, and power cycling.

Matching Components

Transistor Substitution Guidance

Checking Diodes and Rectifiers In-Circuit

In-Circuit Diode Test Procedure

Steps for connecting leads, setting switches, and interpreting results for in-circuit diode tests.

Checking Diodes and Rectifiers Out of Circuit

Out-of-Circuit Diode Test Procedure

Steps for connecting leads, setting switches, and comparing forward/reverse current.

Zener Diode Testing

Varicap Diode Testing

Other Semiconductor Devices

Solid State Servicing Hints

Disassembly Instructions

TF151 Calibration

Leakage Calibration Procedure

Step-by-step guide to calibrate the leakage measurement.

Gm Calibration Procedure

Step-by-step guide to calibrate the Gm measurement.

Circuit Description

TF151 Troubleshooting Chart

TF151 Parts List

Included Items

Service and Warranty Information