9327 1-GHz Amplifier and Timing Discriminator

 Specifications

PERFORMANCE

Performance is measured on the 0 to –30 mV input range unless specified otherwise.

INPUT RANGE 0 to –30 mV (full scale) or 0 to –150 mV (full scale), selectable via a circuit board jumper.

EQUIVALENT INPUT NOISE <100 uV rms on the 0 to –30 mV range.

TIME SLEWING (Walk) Typically <±40 ps shift in the timing output as a function of pulse amplitude over the top 90% of full scale. Includes the contribution of both the amplifier and the timing discriminator. Measured with an input pulse width of 300 ps FWHM.

TIMING JITTER <20 ps FWHM for a pulse amplitude at 50% of full scale. Measured with the same pulse shape listed under TIME SLEWING.

PULSE-PAIR RESOLUTION <10 ns at the fast negative NIM outputs.

OPERATING TEMPERATURE RANGE 0 to 50°C.

TRANSMISSION DELAY TEMPERATUR E SENSITIVITY <10 ps/°C from 0 to 50°C. Measured at 50% of full scale with the pulse shape listed under TIME SLEWING.

CONTROLS AND INDICATORS

INPUT RANGE (Coarse Gain) Circuit board jumper near the amplifier INPUT permits input range selection for 0 to –30 mV or 0 to –150 mV.

FINE GAIN Front-panel, 15-turn screwdriver adjustment to calibrate the full-scale sensitivity. Can be used as a fine gain control with approximately a 2:1 range of gain adjustment.

THRESH Front-panel, 15-turn screwdriver adjustment to set the input discriminator threshold. Adjustable from <2% to >50% of full scale. THRESH test-point jack permits monitoring the setting with a voltmeter.

WALK Front-panel, 15-turn, screwdriver fine tuning to minimize time slewing as a function of input pulse amplitude. Adjustable over a range of approximately ±150 mV. A WALK test jack permits monitoring the actual voltage setting through an output impedance <100 W.

OUTPUT LED Front-panel, LED flashes on each output pulse to indicate active triggering. Used to set the threshold beyond the noise level.

OVER RANGE LED Front-panel, LED flashes on each preamplifier pulse that has an amplitude exceeding full scale. Used during detector gain adjustment to avoid overloads while maximizing pulse amplitudes.

PWR LED Front-panel LED indicates when power is being supplied to the unit.

INPUTS AND OUTPUTS

INPUT (Amplifier) Rear-panel SMA connector for negative input pulses. Accepts pulse widths from 250 ps to 5 ns FWHM. Optimized for sub-nanosecond pulse widths. Input range is jumper selectable for 0 to –30 mV or 0 to –150 mV. Input impedance: 50 W ac, <1000 W dc to ground. Diode clamps provide protection against overload to ±2 V dc, or ±10 V for a 50 ns-wide pulse at a duty cycle <1%.

AMP OUT Rear-panel SMA test point suitable for oscilloscope monitoring via a 50-W coaxial cable terminated in 50 W. Test point output impedance: 1000 W. The amplifier drives the timing discriminator input in parallel with the output monitor via an internal connection.

NIM OUT Front- and rear-panel BNC connectors provide two independent, fast-negative NIM output logic pulses. Output amplitude is nominally –800 mV into a 50-W load.Pulse width is nominally 4 ns.

TTL OUT Rear-panel BNC connector provides a positive TTL pulse, triggered by the fast-negative NIM output. The 100-ns width of the TTL pulse is non-updating. Output impedance: <50 W, short-circuit protected.

THRESH Front-panel test-point jack near the THRESH control permits monitoring of the threshold setting with a voltmeter for resettability. Output impedance is 1000 W. Nominal output range is –10 mV to –1 V.

WALK Front-panel test-point jack near the WALK adjustment for monitoring the walk (time slewing) adjustment. See WALK under Controls and Indicators.

GND Front-panel test-point jack for connecting the ground lead of a voltmeter.

ELECTRICAL AND MECHANICAL

POWER REQUIRED The Model 9327 derives its power through a 3-meter long (9-ft.) captive power cable terminated with a 9-pin D, preamplifier power connector. This connector is compatible with the preamplifier power connectors on ORTEC Models 9328, 9308, 4003, 4002P, or most ORTEC spectroscopy amplifiers. Power required is +12 to +15 V at 350 mA (Pin 4) and ground (Pins 1 and 2).

WEIGHT
Net 0.48 kg (1.1 lb).
Shipping 1.1 kg (2.5 lb).

DIMENSIONS Approximately 3.3 cm x 12.5 cm x 13.5 cm (1.3 in. x 4.9 in. x 5.3 in.).

MISCELLANEOUS Meets EEC standards (CE) for emissions, susceptibility, and power.

ORDERING INFORMATION