Kepco APH2000M

The APH power supplies are high voltage automatic crossover (voltage/current) stabilizers which can be set or programmed to any level within their rated range and be fully loaded at any output setting.

Large panel-mounted analog meters allow monitoring of both voltage and current channels. Digital meters are available as an option. Substitute the suffix "DM" for the suffix "M" to specify the digital meter option. Two 10-turn rheostats provide high resolution voltage and current settings. Panel-mounted LEDs indicate voltage- or current-mode operation. This information is simultaneously delivered as an optically isolated, TTL-compatible flag to a rear terminal. A built-in uncommitted amplifier can be used for summing, scaling, and programming by passive resistance. It has both inverting and non-inverting inputs available. Open loop gain of the uncommitted amplifier is in excess of 20,000 volts per volt.

The APH are especially suited for applications requiring low output noise, high stability and programmability.

Features:

• High voltage programmable output.
• 20 watts output power.
• Voltage and current stabilization.
• Analog programmable 0-5V input for voltage, 0-1V for current.
• Low noise linear control using a high voltage vacuum tube.
• 10-turn panel controls offer exceptional resolution.
• Large output and feedback capacitors in the APH high voltage power supplies provide the noise reduction and energy storage needed for stabilizing voltages with a rapidly changing current load. Built-in current sensing and control provide precision current stabilization.
• The voltage rheostat controls an operational pre-amplifier which produces a 0-5V d-c signal to drive a fixed-gain voltage amplifier. For external control an external 0-5V, 1mA signal can substitute for the signal produced by the preamplifier. To use an external signal with a different range, it can be put through the uncommitted ampliÞer, which will scale any signal to the 0-5V range. The uncommitted amplifier can be precisely zeroed.
• The current rheostat controls current as a differential comparator using a 0-1V analog of the output current. A separate circuit is provided for external control with a 0-1V signal.
• Full zeroing and calibrating facilities are provided in both the voltage and the current control channels for compatibility with the Kepco SN series digital programming interfaces. The SN digital controllers may be used for the APH 500M and APH 1000M only. SN controllers may be used with model APH 2000M if operated plus-common (negative output) only.