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.
| 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) | ||
