MEASARplus is a modular electronic instrument to operate systems with multiple channel electron multipliers (CEMs) or photomultipliers (PMTs) and evaluate all output signals simultaneously by pulse counting.

It consists of a mechanical housing in 19"-subrack technology, with a module high voltage generation, pulse counting, current and charge monitoring, and one system controller module with an RS 232-interface, which may easily be translated to USB by means of an external bridging circuit, to connect the system to a host computer. The computer sets the high voltage, discriminator threshold, and measurement time. Measurements can be run by start command or automatically repeated.

 

	Parameters	Units	Range
	High Voltage	V	+ 128 to + 4095
	HV slope (1 bit)	V/s	±100 or ±800
	Preamplifier threshold	mV	- 3 to - 130.5, step size = 0.5
	Preamplifier deadtime	ns	15 - 30 - 60 - 100
	Measurement time interval	ms	unlimited, stop by command, or
			(1 to 65535) x 10
	Measurement repetitions		unlimited, stop by command, or
			1 to 255 automatically repeated
	CEM overload protection	µA	max. anode current (1-15) x 1.024
	Anode bias	V	- 120 (±10)
	Click here for the full specification		Click here for the Interface Protocol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 3 MEASARplus for use of five individual CEMs