Model 4161A
Dual Channel ADC, Display, and Control Module

General
The model 4161A is a dual channel, analog to digital converter (ADC) module which will measure one or two analog voltages, display the result on a digital panel meter, and allow it to be read by an external computer connected to the module's RS232 or GPIB interface.

The module has two signal input channels, A and B, each with a full-scale sensitivity of ±10 V DC. On receipt of a trigger command at the appropriate channel the input voltage is digitized to a 5 mV resolution. A computer coupled to the module can determine the value of the input voltage by sending a simple ASCII command. The 3½ digit panel meter on the 4161A can be switched to monitor either of the signal channels.

The model 4161A is primarily intended to act as the interface between one or two model 4121B boxcar averager modules and the controlling computer. In multiple 4121B systems more than one 4161A can be used to digitize the data from several boxcar averagers, with all the results being read via the GPIB interface. When used with such systems incorporating, in addition, the model 9650A Digital Delay Generator, the 4161A’s Busy Out trigger hold-off output can be used to allow the computer to control the overall rate of data acquisition, by preventing new data points being acquired until the previous ones have been processed.

An edge-indicating analog panel meter is also incorporated into the module which is especially useful during the setup of boxcar systems.

The module is supported by our Acquire data acquisition software and a free LabVIEW driver that can be downloaded from this site.

Model 4161A Dual Channel ADC/Control Module

Input
	Channels	Two
	ADC Inputs	BNC front-panel connectors, A and B
	Input Impedance	1 MΩ
	Input Full-Scale	±10 V
	Accuracy	±5 mV
	Linearity	±5 mV
	ADC Trigger Inputs	BNC front-panel connectors, corresponding to channel A and channel B ADC inputs. Connectors are duplicated on rear-panel
	Trigger Thresholds	TTL. Triggers on rising edge of applied positive logic TTL pulse
Digital Display
	Type	3½ digit LED display showing (Measured voltage / 20)
	Display Selection	Switch selects channel A or channel B
Computer Interfaces
	RS232	DIP switch selectable baud rate, terminator, character echo, parity and data bits
	GPIB	DIP switch selectable address and terminator
	Status Indicators	Front panel LEDs indicate GPIB Talk, Listen, SRQ and Remote
	Command Set	Twelve mnemonic type commands allowing both asynchronous and synchronous readings. Digitized voltages are reported back to the computer in integer format, with ±2048 corresponding to an input voltage of ±10.24 V
Output
	Busy Out	Rear-panel BNC connector generating TTL signal which under computer control will:- 1) Remain at logic 0 until a synchronized read command is issued by the computer. 2) Go to logic 1, releasing external trigger hold-off circuitry (such as can be provided by the SIGNAL RECOVERY model 9650A). 3) Return to logic 0 on receipt of a trigger signal at either the A or B ADC trigger inputs, and remain there while the measured value(s) are transferred back to the computer and thereafter until the next synchronized read command
Analog Panel Meter
	Type	Edge-indicating meter monitoring the voltage at the associated front-panel analog input BNC connector. This meter is completely independent of the analog to digital converter functions
	Input Impedance	10 kΩ
	Full-scale sensitivity	±10 V
Power Requirements		+24 V at 50 mA; -24 V at 50 mA +12 V at 600 mA; -12 V at 30 mA +6 V at 550 mA; -6 V at 10 mA
Dimensions
	Height	8¾" (222 mm)
	Width	2¾" (70 mm)
	Depth	9¾" (248 mm)
Weight		2.5 lb (1.14 kg)

SIGNAL RECOVERY is part of Advanced Measurement Technology, Inc, a division of AMETEK, Inc.
It includes the businesses formerly trading as EG&G Instruments (Signal Recovery),
EG&G Signal Recovery and PerkinElmer Instruments (Signal Recovery)

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Model 4161A Dual Channel ADC, Display, and Control Module

Model 4161A
Dual Channel ADC, Display, and Control Module