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General Attributes:

ORTEC Model 925 very good price

• Stand-alone instrument designed for bench-top operation
• Interfaces directly to photomultiplier tube bases such as Models 266, 276, and 296 
• Protected against sudden positive or negative high-voltage spikes
• Amplifier provides a 10-volt linear output and features low input noise and a wide gain range to allow a variety of applications
• Lower Level and Upper Level can be set over a 200:1 dynamic range from 50 mV to 9.99 V
• Front-panel push-button selects setting in volts, or count rate in kcps, 3-digit display
• High-voltage supply is continuously adjustable from 50 to 2000 V dc, and the output polarity is selectable

The ACE Mate Preamplifier, Amplifier, Bias Supply, and SCA provides the link between scintillation detectors and most ORTEC Multichannel Analyzers. ACE Mate, a stand-alone instrument designed for bench-top operation, incorporates a low-noise preamplifier, a spectroscopy-type shaping amplifier, a single-channel analyzer, count-rate monitor, HV power supply, and a digital display to monitor these functions. The ACE Mate module interfaces directly to ORTEC photomultiplier tube bases such as the Models 266, 276, and 296, which can be coupled with the 905 series of scintillation detectors.

The preamplifier is noninverting and is intended for use with photomultiplier tubes. The input is ac-coupled and diode-protected against sudden positive or negative high-voltage spikes. A Printed Wiring Board (PWB) switch is provided to bypass the preamplifier when using external preamplifiers, thereby allowing the signal to be connected directly to the internal shaping amplifier.

The spectroscopy shaping amplifier provides a 10-V linear output and features low input noise and a wide gain range to allow a variety of applications. Semi-Gaussian bipolar shaping is used to eliminate baseline shift with count rate change. Bipolar pulse shaping also eliminates the need for pole-zero adjustments, thus simplifying the setup of the ACE Mate.

A single-channel analyzer (SCA) is incorporated in the ACE Mate. The input to the SCA is obtained from the amplifier output. The SCA operates in Windows mode; the Lower Level and Upper Level can be set over a 200:1 dynamic range from 50 mV to 9.99 V. The lower-level reference is selected by a PWB jumper for either the front panel potentiometer or an external signal.

A three-digit display on the front panel allows the user to monitor either the high voltage (in kV), the lower-level and the upper-level SCA discriminator settings (in volts), or the count rate (in kcps). A front-panel push-button selects among these three choices.

The high voltage supply provides the voltage necessary for the photo­multiplier tubes. The output is contin­uously adjust­able from 50 to 2000 V DC and internal PWB jumpers select the output polarity. Front-panel LEDs indicate the presence of high voltage and the polarity. The maximum load current is 1 mA to 2000 V. A front-panel On/Off switch controls the high voltage.

A preamp power connector provides power to tube bases with internal pre­amplifiers.

Specifications