Ortec T120 Quad Updating Discriminator

NIM Model T120 Quad Updating Discriminator

1.1 GENERAL INFORMATION

The T120/N Quad Discriminator Module (Fig. 1) contains four identical and independent direct-coupled discriminators each having a separate output pulse width adjustment. The module will except either linear or digital input, and when the input threshold is exceeded, will produce normal and complementary NIM standard output pulses of predetermined width. In addition, each discriminator circuit contains an updating timer which guarantees that an output pulse will persist for the preselected width after the most recent threshold crossing, independent of the previous threshold crossings. The unit is a double-width NIM-standard module and each of the independent discriminators is circuit protected against overload damage and temperature compensated over the full operational range.

1.2 SPECIFICATIONS

INPUT Impedance 50 ohms

Reflections <= 10% (dc or transient)

Offset 0 +/- 20 mV.

Temp. Coefficient - 0. 1 mV/'C

Power Supply Variation Coefficient < 4 mV/% change in any one supply voltage.

Protection 300V for 1 uSec/Sec

THRESHOLD Level -100mV +/-10mV

Setting Variable, from -50mV to -200mV by means of internal potentiometer

Temp. Coefficient < +/- 0.5mV/'C

Power Supply Variation coefficient < 14mV/% change in any one supply voltage

Second Pulse Sensitivity < 1db change for pulse spacing greater than 9 nSec.

RATE CW Rate 100 MHz (min.)

Pulse Pair Response Counting 8 nSec for two discrete pulses (typ. 50% duty cycle at min. width output)

Timing 10 nSec for 0.5 nSec change in timing

Updating For pulse width > 10nSec the output is present for a time equal to the pulse width setting after the last threshold crossing

SLEWING 1.0 nSec (typ.)

WIDTH Range 5 to 150 nSec (typ.) adjustable by front panel 22-turn potentiometer.

Temp. Coefficient < +/- 0. 2%/' C.

Power Supply Variation Coefficient < 4%/% change in any one supply voltage

OUTPUTS Fanouts 1 dual and one back terminated complement NIM-standard fast logic signal per section.

T₀₁ and T₁₀ 2.0 nSec (typ.)

DELAY 13 nSec (typ.) from threshold crossing to half amplitude point of output pulse

GATING All sections arecontrolled by a single rear panel toggle switch, which is connected to the bin gating line.

TEMP RANGE 0 'C to +50 'C

POWER REQ. +24V @ 107mA
+12V @ 165mA
-12V @ 228mA
-24V @ 173mA

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INPUT	Impedance	50 ohms
	Reflections	<= 10% (dc or transient)
	Offset	0 +/- 20 mV.
	Temp. Coefficient	- 0. 1 mV/'C
	Power Supply Variation Coefficient	< 4 mV/% change in any one supply voltage.
	Protection	300V for 1 uSec/Sec
THRESHOLD	Level	-100mV +/-10mV
	Setting	Variable, from -50mV to -200mV by means of internal potentiometer
	Temp. Coefficient	< +/- 0.5mV/'C
	Power Supply Variation coefficient	< 14mV/% change in any one supply voltage
	Second Pulse Sensitivity	< 1db change for pulse spacing greater than 9 nSec.
RATE	CW Rate	100 MHz (min.)
	Pulse Pair Response Counting	8 nSec for two discrete pulses (typ. 50% duty cycle at min. width output)
	Timing	10 nSec for 0.5 nSec change in timing
	Updating	For pulse width > 10nSec the output is present for a time equal to the pulse width setting after the last threshold crossing
SLEWING		1.0 nSec (typ.)
WIDTH	Range	5 to 150 nSec (typ.) adjustable by front panel 22-turn potentiometer.
	Temp. Coefficient	< +/- 0. 2%/' C.
	Power Supply Variation Coefficient	< 4%/% change in any one supply voltage
OUTPUTS	Fanouts	1 dual and one back terminated complement NIM-standard fast logic signal per section.
	T₀₁ and T₁₀	2.0 nSec (typ.)
DELAY		13 nSec (typ.) from threshold crossing to half amplitude point of output pulse
GATING		All sections arecontrolled by a single rear panel toggle switch, which is connected to the bin gating line.
TEMP RANGE		0 'C to +50 'C
POWER REQ.		+24V @ 107mA +12V @ 165mA -12V @ 228mA -24V @ 173mA