Resumen de Inexpensive Digital Monitoring of Signals from a Spectronic-20 Spectrophotometer
Alex Whitla, Matthew E. Morgan, John R. Amend
Obsolete analog-readout vacuum-tube and solid-state Spectronic-20 family spectrophotometers can be found in most college and university chemistry laboratories. While optically these are good single-beam instruments, their electronics package does not permit attachment of recorders or digital displays. This article describes a simple modification that costs less than $10.00 for parts and will permit direct digital readout of the Spectronic-20 signal with a digital voltmeter or a laboratory interface and a computer. When the external plug is removed, the Spectronic-20 reverts to its normal operating mode.
