Section 3. Bipolar Transistor Tests; Program 4. Common-Emitter Characteristics - Keithley Series 2600 Application Manual

Section 3. Bipolar Transistor Tests

Program 4. Common-emitter Characteristics

--[[
BJT_Comm_Emit(): USES TABLES
This program applies a bias to the base of a BJT (Ib) and sweeps voltage on the collector/
emitter (VCE). The VCE, IB, and IC are then printed.
Required equipment:
(1) Dual-channel Series 2600 System SourceMeter instrument
(1) 2N5089 NPN Transistor
Running this script creates functions that can be used to measure the common emitter
characteristics of transistors. The default values are for an NPN transistor type 2N5089.
The functions created are:
1. BJT_Comm_Emit(istart, istop, isteps, vstart, vstop, vsteps)
--Default values istart = 10uA, istop = 50uA, isteps = 5, vstart = 0V,
vstop = 10V, vsteps = 100
2. Print_Data(isteps,vsteps, ce_volt,ce_curr, base_curr)
See detailed information listed in individual functions.
1) From Test Script Builder
- At the TSP> prompt in the Instrument Control Panel, type BJT_Comm_Emit()
2) From an external program
- Send the entire program text as a string using standard GPIB Write calls.
Rev1: JAC 5.22.2007
]]--
------------------ Keithley TSP Function ------------------
function BJT_Comm_Emit(istart, istop, isteps, vstart, vstop, vsteps) --Configure SMUB to
source a bias
--current on the base and SMUA performs a voltage sweep on the Collector-Emitter from
start to stop in a
--user-defined number of steps.
--SMUB then increments to next bias value and continues to stop value.
--Returns measured voltage and current values.
--Global variables
local l_irange = 100E-6 --Base current source range
APPenDIx A
Scripts
A-19