Surface DC Voltmeter Model SVM2 Specifications
Range: 0 to +/- 29.999 kV (@ 1". Resolution is 1 volt (0.001 kV). Higher voltages can be measured, but at greater distance to avoid sparking, and formulas are used to correct the readings.
Sensor Type: Metal disc. The display reads a number proportional to total charge on the disc, which remains within 3 V of ground over the +/- 30kV (displayed) operating range. Capacitance is 3 nF, and for each 1 V on the disc, the display reads 10 kV, so that the sensitivity to accumulated charge is 10 kV per 3 nC (3 nano ampsec).
Drift and Leakage: Sensor resistance is > 20 T ohms, which results in a self-discharge half life of > 10 hours in the absence of air ions. Maximum drift current on the sensor is +/- 5 fA (5x10-15 amp), which results in a maximum display drift of 1 volt/minute in the absence of air ions.
Accuracy: +/- 2% of reading (example: a reading of 1.003 kV is accurate to +/- 0.020 kV). This assumes that the meter was correctly "Reset" initially.
Battery: Standard replaceable 9 volt rectangular battery (included). Battery life is about 30 hours (12 milliamp drain). LOW BATTERY displays when about 2 hours are left.
Display Speed: 4 updates per second. Full response to a sudden change is 1/4 second.
Reset: If pressed, this button simultaneously removes the accumulated charge on the sensor (which causes the display to read zero) and resets both the Peak Hold memories to zero. If "Alarm Set" is held down first and then "Reset" is pressed, the alarm threshold is reset to zero. In this case, the sensor charge and Peak Hold memories are not reset.
Alarm Set: Press this to display the present alarm threshold value. While holding this button, press "+" or "-" to change the value (0 to +20.000 kV), or press "Reset" to return to zero.
Standard Alarm Function: Between -20 kV and +20 kV, the alarm sounds if the actual voltage is above the "Alarm Set" number. If "Alarm Set" is zero, the standard alarm is disabled (muted).
High-Voltage Alarm Function: A safety feature--if the voltage ever exceeds 20 kV, sparking becomes likely. A different (lower) tone sounds even if the alarm is muted.
Sampling Speed: The Peak Hold and Alarm both sample continuously. The characteristic (1/e) time is 0.005 sec. Guaranteed 98% response for any a pulse that is 0.015 sec or longer.
Auto Off: If no buttons are pressed for 10 minutes, the meter will turn off.
Warranty: One year. A certificate is optional. Meter can be recalibrated by AlphaLab Inc. This meter does not drift in gain, so recalibration is not necessary in less than 10 years.
Includes: Meter, 20 foot grounding cord (necessary if user is not earth grounded), magnetically-attached 1" spacer, battery (already inserted). As shipped, the meter is ready to use.
Manufactured in USA by AlphaLab, Inc. / 3005 South 300 West St. / Salt Lake City UT 84115 USA / TriField.com, Detectortechnologies.com / Tel. 1 801 487 9492 / - -USA & Canada Toll-Free 1 800 658 7030. Fax 1 801 487 3877.