CHARACTERISTICS

1.1 GENERAL INFORMATION
The T200/N Fast Counting Discriminator Module (Figure 1) is a direct-coupled fast counting and timing discriminator. The T200/N produces an output signal having a pulse width of either 3 nSec or 5 nSec for each input signal that exceeds the threshold level. The input bandpass characteristic, which is essentially flat, permits the T200/N to be level sensitive, without risetime dependence, and results in precise subnanosecond timing with minimal slewing.

1.2  SPECIFICATIONS

INPUT	Impedance	50 ohm
	Reflections	< 5% DC < 5% for 1 nSec risetime signals up to breakdown limits.
	Breakdown	+/-5 Vdc, + 50 V 100 nSec pulse width of duty factor less than 10% +/- 200 V transient.
INHIBIT INPUT	Input Signal	NIM-standard fast logic signals
	Impedance	50 ohm
	Reflections	< 5% DC < 8% for 1 nSec risetime signals up to breakdown limits.
	Breakdown	+/-5 Vdc, +/-50 V, 100 nSec pulse width of duty factor less than 10%, +/- 200 V transient.
	Selectivity	Capable of inhibiting one pulse out of a burst with 4 nSec pulse spacing.
THRESHOLD	Range	-100 mV to -250 mV (adjustable by means of a front panel control).
RATE		>225 MHz CW or burst.  < 5 nSec pulse-pair resolution (4 nSec typ.)
SLEWING		< 1. 0 nSec from threshold (50% triggering probability) to 10X threshold. (0. 7 nSec typical)
OUTPUT PULSE WIDTH		3 nSec or 5 nSec, switch selectable
OUTPUT		Two "dual" NIM-standard logic signals.  Difference in output pulse pair spacing with respect to input pulse-pair spacing <0. 5 nSec for pulse spacing > 4. 0 nSec.
GATING	Input Inpedance	4K ohm
	Signal	NIM-standard slow logic signal. Inhibit Voltage Range: > -2V to + 1. 5V
	Enable Voltage Range	+3V to greater than + 12V
TEMP> RANGE		0'C to +50'C
POWER REQ.		+24V, 150 mA +12V, 80 mA -24V, 190 mA -12V, 175 mA
PANEL COLOR		Black