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Machine QA Patient QA Diagnostic Health Physics

SuperMAX™ Electrometer

The premier two-channel, reference-grade electrometer on the market.

SuperMAX™ Electrometer part of complete solution for: Stereotactic Absolute Dosimetry CyberKnife

SuperMAX™ Electrometer Overview

Two Independent Measurement Channels

  • Independent control over range, bias voltage, and applied system factor.
  • Both channels feature extensive range (0.001 pA to 500.0 nA, 0.001 pC to 999.9 µC) for use in a variety of applications, including ratio measurements.

Built-In Detector Library

  • Eliminates the need for a PC or to apply system factor and temperature/pressure corrections.
  • Store over 100 detectors and calibrations.
  • Apply individual factors to one or both measurement channels.

Easy-to-Use Interface

  • Large, color display with built-in touchscreen.
  • On-screen keypad and pull down menus allows for easy access to settings and detector library.

Store Data Collection

  • Measurements are stored from all data collection.
  • Set automatic repeat measurements.

Exradin W1 Scintillator Integration

Two dedicated modes in the SuperMAX allow for seamless calculations using the Exradin W1 Scintillator.

Rate Mode Display Ranges

  • LOW: 0.001 pA – 500.0 pA
  • HIGH: 0.001 nA – 500.0 nA

Charge Mode Display Ranges

  • LOW: 0.001 pC – 999.9 μC
  • HIGH: 0.001 nC - 999.9 μC

Rated Effective Range on Input Currents Per IEC 60731 for Reference Grade

  • 0.400 pA – 500.0 nA (± .25% of minimum effective scale reading)

Measuring Range

  • LOW: 0.400 pA - 500 pA, 0.400 pC - 999.9 μC
  • HIGH: 0.400 nA - 500 nA, 0.400 nC - 999.9 μC

Bias Voltage

  • Nominal ±1000 V
  • 0, (±) 100 - 1000 V in 1 V increments

Range Switching

  • User selectable

Display Resolution

  • LOW: Rate mode/Charge mode
    0.001 pA / 0.001 pC
  • HIGH: Rate mode/Charge mode
    0.001 nA / 0.001 nC

Repeatability

  • Low range: 0.25%
  • High range: ± 0.1%

Long Term Stability

  • ± 0.5% over 1 year

Stabilization Time

  • ± 0.1% of value at 1 hour for measurements taken at 15 minutes and 6 hours

Non-linearity:

  • ± 0.25%

Zero Drift

  • Rate mode: ± 0.25% of minimum effective scale reading (LOW/HIGH: < ± 0.001 pA / < ± 0.001 nA)

Zero Shift

  • Rate mode: ± 0.25% of minimum effective scale reading (LOW/HIGH: < ± 0.001 pA / < ± 0.001 nA)

Charge Leakage Current

  • LOW/HIGH: < ± 0.001 pA / < ± 0.001 nA

Response Time

  • Low range rate: < 12 seconds, High range rate: < 2 seconds
  • Low range charge: <2 seconds, High range charge: <0.3 seconds

Main Software Functions

  • Channel 1 Measurement, Channel 2 Measurement, Channel 1 & 2 Measurement, Scintillator Measurement, Check Source Library, Chamber Library, Scintillator Baseline Library, Preferences

Charge Collection Modes

  • Timed Mode - Selectable timer from 1 to 600 seconds in 1 second increments
  • Continuous Mode (Manual Start/Stop) - Press Start to begin collection and Stop to end
  • Trigger Mode – current exceeding pre-selected trigger values starts and stops collection

Countup/Countdown Resolution

  • 1 second (count up for Continuous Mode, count down for Timed Mode)

Trigger Levels for Charge

  • Collection
    Start value must be larger than stop value (set via Preferences interface)
  • Start
    0.2 - 9.9 pA
  • Stop
    0.1 - 9.8 pA

Operating Parameters

  • Temperature
    15 to 35 °C
  • Relative Humidity
    20 to 80% non-condensing
  • Pressure
    650 to 770 mmHg

Storage Parameters

  • Temperature
    -15 to 50 °C
  • Relative Humidity
    10 to 95% non-condensing
  • Pressure
    600 to 800 mmHg

Display

  • Color LCD TFT touch screen. VGA (640x480) resolution, 6.4” diagonal

Input

  • 2 channels, BNC two lug triaxial connector (TNC option is available.)

Bias Voltage

  • ± VDC for the following: 0 to 1000 VDC in 1 VDC increments, 350 μA max

Zeroing

  • Zero via button push - Display indicates zeroing in progress

Ports

  • RS232 (Default: Uni-directional 19,200 baud, 8 data bits, no parity, 1 stop bit; Bi-directional operation via user commands, tech note available upon request) (2) USB ports (keyboard, thumb drive, or mouse support) Ethernet (internal use only, not currently supported)

Chamber library calibration coefficients

  • Amp System factors
    Nsk:μGym²/(h*A)
  • Nsk:Gym²/(h*A)
  • Nx,sk:Rm²/(h*A)
  • NA:GBq/A
  • NA:Ci/A
  • ND,W:mGy/(sec*A)
  • NA:MBq/A
  • NA:mCi/A
  • Coulombs System Factors
    Nk:Gy/C
  • Nx:R/C
  • NGas:Gy/C
  • ND:Gy/C
  • ND,W:Gy/C

Real-Time Clock

  • On board, for data validation and storage

Audio

  • On board speaker for audio feedback on start-up, button presses, operator alerts, etc.

Dimensions

  • Width
    26.7 cm (10.5 in)
  • Height
    8.1 cm (3.2 in)
  • Length
    21.1 cm (8.3 in)
  • Weight
    2.5 kg (5.45 lbs)
  • Mode of Operation
    Continuous

Power Requirements

  • 100-240 VAC, 0.5 A max, 50/60 Hz input to external power supply, 9 VDC, 2.0 A power supply output to electrometer input, Globtek®, Inc. model GTM 96180-1811-2.0-T.
  • The use of any other power supply and using alternates other than the UL/CSA recognized power cord can degrade minimum safety. The proper replacements from Standard Imaging, Inc. are required for compliance with the requirements of IEC 60601-1.

Product Standards

  • IEC 60601-1:3rd Edition1, IEC 607312
  • 1 Externally Certified; 2 Designed to Meet

Shock Classifications

  • Class I - External Power Supply
  • Class II - Electrometer

Videos

Tech Notes

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