Design Ideas for Test & Measurement

Test circuits for Interfaces	Test circuits for Power
Connector adds plug-and-play capability PC acts as RS-232C protocol analyzer Ring oscillator measures cable length Cable tester is fast and cheap Ethernet 10BaseT simulator jig yields zero emissions	Negative regulator has <0.4V dropout voltage Load pulser tests supply's transient response Protection circuit covers a wide range Battery monitor emulates auto dashboard Circuit tests power-outage susceptibility
Genreral test circuits	System test
Gates provide low-cost sine-wave generator Precision current sink costs less than $20 Oscillator keeps THD below 1 ppm Negative resistance increases inductor's Q Fast amplifiers simplify ac measurement 10-octave audio generator speeds tests Circuit measures software-execution time	Setup evaluates response of mechanical system Watchdog timer reboots PCs Debugging embedded systems: using a serial condition monitor Mixed-signal algorithm tests transducers Simple procedure tests transducer
Power for testers	Temperature test circuits
Off-hook phone line supplies 150 mW Battery-powered amplifier has optical isolation	IC diodes help deduce junction temperature Airflow monitor protects components Controller provides closed-loop temperature regulation
Test equipment designs
Simple phase meter operates to 10 MHz Reset card eases A�P troubleshooting High-frequency AGC has digital control Calibration technique uses sound Digital pot adjusts LCD's contrast in portable test system Fleapower circuit detects short circuits Pulse generator verifies test setups Verilog code models boundary-scan TAP machine Two LEDs perform rudimentary spectral analysis Simple ESD gun tests IC Use derivatives to catch RF calibration errors Undersampling extends utility of digital scopes

Design Ideas for Test & Measurement

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