SPECTROPHOTOMETER SOURCE LAMP

摘要

A single atomic element hollow cathode lamp assembly (HCL) has a lamp formed by a hollow cathode electrode (CA) and an anode electrode (AN) within a sealed envelope (SE). A base (BA) is attached to the envelope (SE), and located within the base (BA) is a resistor network (RN) consisting of four resistor (R1, R2, R3 and R4) connected to a common lead (EL). Two plug terminals (P6 and P7) protruding from the base (BA) and connected respectively to the electrodes (CA and AN) provide connecting means for connecting these electrodes to lamp power supply means (LPS). Five plug terminals (P1 to P5) protruding from the base (BA) and connected respectively to the resistors (R1 to R4) and the common lead (EL) provide further connecting means for including the resistor network in measurement circuit means (MCM) in an atomic absorption spectrophotometer. The resistor network represents the atomic element of the lamp by virtue of two of the resistors (R1 and R2) and furthermore represents a lamp operating current by virtue of the other two resistors (R3 and R4). The terminals (P1 to P7) are arranged in a conventional octal plug configuration with a boss (BA1) on the base (BA) for ensuring correct electrical connection.