L4532 logic Unit

The ECLine Model 4532 answers most of the majority logic problems encountered in modern High Energy Physics Experiments. Here is the full manual.

The Model 4532 calculates the multiplicity value from 32 logic channels and presents the result as a current proportional to the number of inputs up to a maximum of 16. These may be either individual inputs or clusters (i.e. adjacent inputs are counted as one input) as determined by a side switch. The multiplicity calculation can either be performed on the overlap of input pulses during a time determined by an externally applied gate (e.g. with photomultipliers), or on latched levels which are set by inputs occurring within a predetermined time window (e.g. for use with propor- tional chambers). In the latter mode, the analog output will increase as each pulse arrives at the inputs. The time window can be either internally generated or externally provided. The internal time window is self-triggered by the first input pulse arriving after a previous reset. A front panel potentiometer permits adjustment of the time window.

In addition to the front panel outputs, the Model 4532 also stores the input information which ar- rived during the time window in a CAMAC addressable 32-bit register. In both the overlap Memory Disable and latching Memory Enable modes, a front panel output provides a two by two OR of the gated inputs. The OR is performed on channels 1 and 2, 3 and 4, etc. In Overlap mode, the outputs will be pulses having a width determined by the input pulse widths, while in Latching mode the outputs will be levels set by the leading edge of the input pulses and reset by the CAMAC or front panel fast reset functions.

The Model 4532 analog output is provided on two paralleled connectors to permit the cascading of several majority units and extending the multiplicity calculation beyond 32 inputs.

Test functions for card

Number of triggers that have to fire to cause event

Enabled channels will appear in the data read out list with the label that is specified in the dialog for that channel. If an event is triggered, each of the items in the read out list for each triggered channel will be read out.

Event Record

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

^^^^ ^^^^ ^^^^ ^^-----------------------data id

^^ ^^^^ ^^^^ ^^^^ ^^^^-length in longs

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx event count

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

^ ^^^---------------------------crate

^ ^^^^---------------------card

if timestamp included the next two words follow, otherwise nothing. Check the length!

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

^^^^ ^^^^ ^^^^ ^^^^ ^^^^ ^^^^ ^^^^ ^^^^-reference date (high part of double)

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx