Gaussmeter (Hirst GM08)¶
The Beamline group owns a Hirst GM08 gaussmeter with a variety of interchangeable probes. The GM08 has USB and RS-232 ports for remote readout, and a range of 0-3 Tesla. This unit has been used for the beamline magnet polarity checks, including MICE Notes 198 and 520.
The unit is calibrated annually, which involves separately correcting the response of the probe and of the measurement unit to those of idealised circuits (p. 3 of the manual). This should shouldn't degrade performance of the meter with any other probe, beyond any drift or damage to the probe itself, but the formal calibration certificate is only valid for that particular probe/meter combination.
The calibration certificate includes a table of actual and measured fields, allowing a correction to be applied external to the instrument. The relevant section of the certificates is reproduced in the corresponding eLog entries (table below).
Probes / Calibrations¶
The calibration certificate is valid for 14 months.
|PT4972||TP002 transverse probe, 1 m lead||31 August 2007||to 3 Tesla: 31 October 2014|
|PS2034||TP002 transverse probe, 3 m lead||11 October 2013||to 3 Tesla: 12 July 2016|
|PS2035||AP002 axial probe, 3 m lead|
|PS2185||TP006 1 m transverse probe, 3 m lead||19 October 2012|
Brunel Gaussmeter (Hirst GM04)¶
Certain measurements have been made with a GM04 meter and probe borrowed from Brunel University.
|PT0112||TP002 transverse probe, 1 m lead||October 2012|
|AP002 axial probe, 1 m lead||October 2012|