Section 6. High Power Tests; Program 6. Current Gain; Program 6A . Current Gain (Search Method - Keithley Series 2600 Application Manual

APPenDIx A
Scripts

Section 6. High Power Tests

Program 6. Current Gain

Program 6A. Current Gain (Search Method)
--[[
DC_Gain_Search():
This program performs a binary search on the base current (IB) of a BJT at a fixed
collector-emitter voltage (VCE). The base-emitter (IB) and collector-emitter (IC) currents
are measured and the IB, IC, and DC gain values are printed.
Required equipment:
(1) Dual-channel Keithley Series 2600 System SourceMeter instrument
(1) 2N5089 NPN transistor
Running this script creates functions that can be used to create a DC gain search of
transistors. The default values are for an NPN transistor type 2N5089.
The functions created are:
1. DC_Gain_Search(vcesource, lowib, highib, targetic)
--Default values vcesource = 5V, lowib = 1e-9A, highib = 100e-7A,
targetic = 100e-6A
2. Check_Comp()
See detailed information listed in individual functions.
To run:
1) From Test Script Builder
- Right-click in the program window, select "Run as TSP"
- At the TSP> prompt in the Instrument Control Panel, type DC_Gain_Search()
2) From an external program
- Send the entire program text as a string using standard GPIB Write calls.
Rev1: JAC 6.11.2007
]]--
------------------ Keithley TSP Function ------------------
function DC_Gain_Search(vcesource, lowib, highib, targetic) --Configure SMUB to source a
user-defined
--current on the base (Ib) while SMUA performs a fixed voltage bias on the collector-
emitter. SMUB then performs a
A-28