Operator's Manual
Issue 14 / Mar 2016
MercuryiPS
©2016 Oxford Instruments NanoScience. All rights reserved.
Page 159
17.8 Level meter board
Helium probe specifications
Parameter Specification
Excitation current settings 20 mA to 280 mA in 20 mA steps
Excitation current accuracy ±5%
Excitation voltage 40 V maximum
Probe resistance 0 to 300 ohms
Probe resistance measurement accuracy ±0.2%
Probe resistance measurement stability ±0.1%
Probe resistance ADC measurement resolution Better than 0.005%
Probe connections isolation to chassis >50 VDC
Nitrogen probe specifications
Parameter Specification
Probe source voltage 12 VDC
Probe source oscillator frequency range 5 kHz to 90 kHz
Probe sensing resolution (level) 0.1%
Probe sensing accuracy (level) 0.5%
17.9 Pressure board
Parameter Specification
Measurement absolute accuracy ±0.1% full scale in each range
Measurement Resolution 24 bits
Voltage Measurement Ranges 10V, 1.6V, 0.8V, 0.4V, 0.2V, 0-0.1V (Auto-ranging)
Current Measurement Ranges
4-20mA (20mA, 16mA, 8mA, 4mA Auto-ranging)
Measurement Frequency 1Hz-10Hz
Sensor Excitation Voltage 0 V(off) , 10V±5% or 15V±5%
Sensor Excitation Current 0 - 20 mA
Sensor Excitation Current Trip >30mA
Short Circuit Protection Duration Indefinite
Isolation From Mercury Chassis 50 Volts
Over Voltage Protection Diode on each connector pin: 50V/200mA
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