Series MWPC Specification

SERIES MWPC: MULTWIRE PROPORTIONAL COUNTER NIM POWER SUPPLIES, DC POWERED

INDEPENDENT DUAL OUTPUTS, UP TO 10kV
SHORT CIRCUIT AND ARC PROTECTED
LOW RIPPLE AND NOISE
FRONT PANEL AND REMOTE CONTROL
FRONT PANEL AND REMOTE MONITORING
FAST AND SLOW OVERLOAD DETECTORS
HOLD AND AUTO RESET TRIP MODES

DESCRIPTION

The Bertan MWPC Series are precision high holtage power supplies designed for use with multiwire proportional counters. They utilize Bertan's proprietary linear circuitry for the generation of highly stable, regulated, low noise output voltages. Each double width NIM MWPC power supply contains two identically rated high voltage power supplies.

The two high voltage outputs are fixed polarity, both positive, both negative or one of each. Each output is completely independent of the other, allowing greater local and remote programming flexibility.

Fast and slow automatic overcurrent detectors insure protection of sensitive MWPC loads. Trip mode control and monitoring is provided for each output. Precision output current auto nulling circuitry eliminates the need for zero offset adjustment and provides front panel current monitoring for each output, with a sensitivity of 100nA full scale.

Front panel, precision, 10-turn potentiometers and counter dials provide an accurate setting of each of the high voltage outputs. Independent remote programming of the outputs can also be selected.


         |-------OUTPUT A--------|   |-------OUTPUT B--------|                      

  ------------------------------------------------------------

  MODEL     VOLTAGE      CURRENT        VOLTAGE      CURRENT

  ------------------------------------------------------------

  375P   0 to +5,000V   0 to 500uA   0 to +5,000V   0 to 500uA

  375N   0 to -5,000V   0 to 500uA   0 to -5,000V   0 to 500uA 

  375X   0 to +5,000V   0 to 500uA   0 to -5,000V   0 to 500uA

  377P   0 to +7,500V   0 to 500uA   0 to +7,500V   0 to 500uA

  377N   0 to -7,500V   0 to 500uA   0 to -7,500V   0 to 500uA

  377X   0 to +7,500V   0 to 500uA   0 to -7,500V   0 to 500uA

  380P   0 to +10,000V  0 to 300uA   0 to +10,000V  0 to 300uA

  380N   0 to -10,000V  0 to 300uA   0 to -10,000V  0 to 300uA

  380X   0 to +10,000V  0 to 300uA   0 to -10,000V  0 to 300uA

All models have two, independent, fixed polarity, high voltage outputs, OUTPUT A and OUTPUT B. The polarity of each output is specified by the model suffix; P (Positive), N (Negative), or X (one of each polarity).

SPECIFICATIONS

OUTPUT

Voltage and Current:
See chart.

Ripple:
50mV peak-to-peak maximum at maximum output.

INPUT

Power:
+/-12Vdc at 900mA maximum from NIM bin power supply.

PERFORMANCE

Line Regulation:
+/-0.001% for +/-1% change in input bin dc voltage.

Load Regulation:
+/-0.002% for +/- full output current change.

Ripple:
50 mV peak to peak maximum at maximum power output.

Stability (after 1/2 hour warm-up):
0.01%/hr, 0.02%/8 hrs.

Temperature Coefficient (0 to 50C):
50ppm per degree C:

FEATURES

High Voltage ON-OFF Switches:
Independent high voltage power supply ON-OFF power switches and power on indicators for control of each output.

Precision High Voltage Control:
Two independent multi-turn potentiometers and precision indicator dials control the output high voltages for each power supply when operating in the local mode.

Remote High Voltage Programming:
Rear REMOTE-LOCAL switches (one for each power supply) select front panel control or remote programming of the high voltage outputs. A programming voltage of +1V per 1kV output is applied at the rear panel REMOTE INPUT connector. Separate connector pins allow independent programming of each output.

High Voltage Monitors:
Two miniature coaxial connectors are provided on the front panel for monitoring each high voltage output. The monitor output is 1V per kV. Monitor accuracy is +/-(0.1% of reading + 0.02% of maximum). The output impedance is 10 kohms.

Output Current Monitors:
Two miniature coaxial connectors are provided on the front panel for monitoring each power supply output current. The current monitor output is 1V per 100uA. Monitor accuracy is +/-(1.5% of reading + 1.5% of maximum). The output impedance is a function of the METER RANGE switch position (100 kohms maximum).

Meter Range Switches:
Two 5 position front panel rotary switches select the desired current meter range for each power supply (1mA, 100uA, 10uA, and 0.1uA current full scale can be selected).

Output Current Meters:
Two front panel meters read the true output current with a full scale sensitivity of from 100nA to 1mA. The meter range switches (see above) select the full scale sensitivity.

Current Trip:
Current trip and automatic high voltage shutdown will occur when the output current of a supply exceeds 80% of the range selected by the meter range switch.

TRIP HOLD/AUTO RESET Switches:
Independent front panel toggle switches select the TRIP HOLD or AUTO RESET mode for each power supply. In TRIP HOLD mode, the high voltage will stay off after an overload. In the AUTO RESET mode the high voltage will cycle off and then on again until the overload is removed.

Trip Monitors:
Front panel, parallel, miniature coaxial connectors provide trip monitoring for each power supply. When either or both supplies trip, the monitor is grounded. The two connectors permit daisy-chaining multiple units to a single remote trip indicator.

Protection:
Short circuit and arc protected, overvoltage limited, fast and slow overcurrent sensing.

MECHANICAL

Size:
2.7'' W x 8.7'' H x 9.7'' D (69 x 221 x 246mm)

Weight:
6.3 lbs (2.9kg)

High Voltage Connectors:
Model 375 uses SHV panel receptacle, Kings type 1707-1. The mating SHV connectors, Kings type 1705-1 (BERTAN part number PAA), are not supplied and must be ordered separately (two per unit).

Models 377 and 380 use 10KV panel receptacles, Kings type 1064-1. The mating 10KV connectors, Kings type 1065-1 (BERTAN part number PBA), are not supplied and must be ordered separately (two per unit).

Power Input Connector:
Standard NIM bin power connector.

Rear Panel Remote Program Connector:
GOB12-88PNE. Mating connector, G6F12-88SNH, must be ordered separately if required.

Monitor Output Connectors:
Front panel connectors, Kings K-LOC 1074-1, are provided for high voltage monitoring, current monitoring, and for trip monitoring of each output. The six mating connectors, Kings 1075-2, must be ordered separately if required.

Rear Panel Bin Gate Connector:
Kings K-LOC 1074-1. The mating connector, Kings 1075-2 must be ordered separately if required.