To aid in the understanding of the capabilities of the Model 8010 Pulse Generator, this section describes the operation of the controls and connectors present on the Model 8010. This instrument conforms electrically and mechan- ically to specifications for NIM (nuclear in- strument modules) per AEC report TID-20893, Rev. 3.

2.2 FUNCTION OF CONTROLS & CONNECTORS

2.2.1 POWER CONNECTOR

Power is applied to the Model 8010 through this connector. Pin 34 is ground. Pin 16 is +12 V. Pin 17 is -12 V. Pin 10 is +6 V.

2.2.2 POWER SELECT

The Model 8010 may be operated from either +/-12 V or +/-12 V and +6 V supplies. With only +/-12 V supplies, the power requirements are 380 mA for +12 V and 100 mA for -12 V. With +/-12 V and +6 V supplies, the requirements are: 80 mA for +12 V, 100 mA for -12 V, and 300 mA for +6 V. The selection of this power option is accomplished by a slide switch mounted on the pc board. In order to operate this slide switch, the right - hand side cover must be removed.

2.2.3 FREQUENCY

This concentric switch and potentiometer com- bination provides the pulse repetition rate con- trol. The switch selects one of eight internally generated repetition rate ranges or an EXT/ S. C. range. With a vernier frequency control mounted concentrically to the range control, a continuous adjustment of the internal rep rate frequency from 1 Hz to 50 MHz is provided. In the EXT/S.C. range, only an EXTERNAL TRIGGER or the SINGLE CYCLE pushbutton will initiate a pulse cycle.

2.2.4 EXTERNAL TRIGGER AND SINGLE CYCLE

With the FREQ switch in the EXT/S.C. posi- tion, an EXTERNAL TRIGGER signal or SINGLE CYCLE pushbutton will start a pulse cycle. A single pulse cycle is initiated by the depression of the SINGLE CYCLE pushbutton on the front panel.

The Model 8010 can be externally triggered from 0 Hz to 50 MHz via signals at the EXT TRIG connector. Signals should be at ',east +1 V, with a rate of rise less than 3 V//Is. The input impedance at the EXT TRIG connector is 50 Ohm.

2.2.5 GATE-SYNCHRONOUS/ASYNCHRONOUS
With proper signals into the EXT GATE con- nector, output and trigger signals can be gated on and off. A low level or short circuit at the EXT GATE connector results in no output or trigger pulses present at their respective con- nectors. An open circuit or a signal greater than +1.5 V at the EXT GATE connector results in the proper trigger and output pulses at their respective connectors.

The SYNC/ASYNC toggle determines whether the gated outputs and triggers will be synchro- nized with the gating waveform. In the SYNC mode, the internal clock is enabled by the
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