FEATURES:
The LeCroy Model LG8252 is a 32-input ADC intended for use in general pur- pose voltage-monitoring applications. The Model LG8213 is a 16-channel ver- sion with identical characteristics unless otherwise noted. The >10M Ohm inputs of the LG8232 respond to voltages over a 10-volt range, converting them to pro- portional 12-bit digital data words. An on-board switch provides the choice of a unipolar mode, 0 to + 10 volts, or a bipolar mode, -5 to + 5 volts. The dif- ferential inputs suppress common mode signals and noise.
The voltage levels at the 32 inputs on the front panel connectors are converted sequentially, requiring a maximum of 60 microseconds/channel for conver- sion and storage in random access memory. During readout the addressed 12-bit data word is placed on the Dataway without any interference with a store cycle, should one be present (asynchronous readout). In the Continuous Scan Mode each channel of the LG8232 continuously updates its memory every 2 ms (1 ms for the LG8213).
Random access readout over the CAMAC Dataway allows the flexibility of reading individual channels or subgroups of the 32 channels more frequently than others, permitting low maintenance items to be monitored compatibly with ones that demand a higher level of attention. Alternatively, a block transfer mode is incorporated which permits all channels to be read sequen- tially. Q = 0 is generated after the last channel is read in block transfer mode. In the Single Scan Mode, either an input into the front-panel Scan Trigger or the CAMAC function F(25)-A(0) initializes the address to Channel 1 and starts a single scan of all channels. This mode thus permits all 32 measurements to be more clearly related in time to some external event or reference. LAM may be generated after the scan is completed.