SuperMAX Electrometer-Temperature Correction
Contents
1. A STANDARDIMAGING TECHNICAL NOTE page 1of2 DATE MARKETS 10 05 15 PAGE NUMBER 4811 00 SUBJECT SuperMAX Electrometer Temperature Correction The following information is provided as a service to our users and customers The SuperMAX electrometer is an advanced two channel electrometer used for measurements in ionizing radiation environments It is well known that the components of electronic instruments can be sensitive to temperature change and the SuperMAX electrometer is no exception In house measurements have shown that the internal temperature of the SuperMAX takes about 2 hours to equilibrate after starting from room temperature in an unpowered state This results in the interior being approximately 6 C above the ambient room temperature If not corrected for this temperature change can affect measurements especially in the low range Since it is not desirable for users to allow 2 hours of warm up a temperature correction algorithm was implemented in the SuperMAX This algorithm corrects for the zero drift that occurs as the temperature changes in the enclosure and allows the device to function acceptably with essentially zero warm up time The required temperature correction can shift as the unit ages which may cause zero drift or charge collection measurements that trend up or down as the SuperMax warms up This is not of consequence for most users if the amount of drift is small comp2. ared with the measurement signal level Additionally the user can simply re zero as needed as described in the user manual However it may be a concern for users performing low level measurements such as with the Exradin W1 If desired a SuperMax returned to Standard Imaging for recalibration or service can be re profiled for the temperature correction at no charge This process automatically recalculates the temperature correction coefficients for both ranges and then verifies it is working properly If zero drift or measurement deviation is suspected please perform the following troubleshooting steps 1 Make sure the SuperMAX has been unplugged and allowed to cool to room temperature for at least 4 hours 2 Plug in the SuperMAX and turn on the display 3 Switch to dual channel mode and put both channels in low range 4 Zero the SuperMAX with nothing connected to the Triaxial inputs and the dust caps in place 3120 Deming Way Middleton WI 53562 2532 e WEB standardimaging com Tel 608 831 0025 e 800 261 4446 e Fax 608 831 2202 DATE MARKETS 10 05 15 PAGE 2 STANDARDIMAGING TECHNICAL NOTE page 2 of 2 NUMBER 4811 00 SUBJECT SuperMAX Electrometer Temperature Correction 5 If the rate reading is more than 10 fA on either channel over the course of 2 hours you may send your SuperMax back to SI to re profile the temperature correction A return authorization can
3. be requested at support standardimaging com 6 If checking the high range the rate reading threshold is 5 pA Note that the display is the primary source of heat inside the enclosure so simply leaving the SuperMax plugged in with the display off is not a complete workaround 3120 Deming Way Middleton WI 53562 2532 e WEB standardimaging com Tel 608 831 0025 800 261 4446 e Fax 608 831 2202
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