The purpose of the dual-mode multiplier is to deliver both analog and pulse-counting signals simultaneously to the detection electronics. A "Gate" electrode is included in the 14222 so that the pulse counting section of the multiplier can be "gated off" to protect it from larger signal peaks.
|Replacement multiplier for instrument||Agilent 7500 (ICPMS)|
|Maximum Dark Current (pA) / Counts (cts/min) at 2.5 kV||1/3|
|Number of dynodes (excluding HED)||11/14|
|Total internal resistance MΩ), [analogue/pulse]||21.5 (12.3/9.2)|
|Typical Gain at -1.8/+1.0 kV (analogue/pulse)||2 x 103/3 x 106|