Surface DC Voltmeter Model SVM2

Manufactured in the USA by AlphaLab, Inc.

An electrostatic meter, the SVM2 reads static electricity without contact. It measures voltage on conductive surfaces and can be used to calculate charge density on insulators. It has peak positive and negative hold, user-settable fast alarm, and very high resolution of 1 volt on a 30K volt range. (For a different meter with 1/10 volt resolution see the Ultra Stable Surface Volt Meter.)

SKU: SVM2 $410

Available Options:
Output Jack: $20, Hard Carrying Case: $18, NIST Traceable Certificate: $30

Available Data Acquisition Option:
Data Logging USB Stick: $140 Logs data from the meter. The stick must be connected to a computer to operate. Output jack included.

Product Description:
The SVM2 is a handheld static electricity meter used to measure the magnitude and polarity of static charge on objects or surfaces. It is typically held 1” (25 mm) from the test surface. On metallic or conductive surface, the meter measures the voltage on the surface. (As with any electrostatic voltmeter, the displayed reading depends somewhat on the size of the object being measured and the distance between the object and the sensor.) On insulating surfaces, “voltage” is not a well-defined number. In this case, the meter reads a number proportional to the static charge present.
The SVM2 has high sensitivity (resolution), and can detect even a 1 volt charge anywhere within its full range of +29,999 to -29,999 volts. Thus it is easy to measure whether a given process is increasing or decreasing the static electricity present, even if the increase or decrease is by a tiny fraction. The meter reads the actual static signal, but it also captures and stores the highest positive and highest negative signals that were experienced since the last time that the “Reset” button was pressed. These peak + and – can be displayed at any later time. The peak function has a “window” time of 0.005 seconds (which is much faster than the display) so even very quick peaks are captured and stored. There is also a user-settable alarm. The alarm will sound if the signal (whether + or -) ever exceeds the value set by the user for at least 0.005 seconds. The alarm can be reset or muted at any time.

With this meter, all of the following can be measured:

SPECIFICATIONS: Surface DC Volt Meter Model SVM2
Range at 1”: 0 to +/- 29.999 kV (29000 Volts)

Resolution at 1":

0.001 kV (1 Volt)
Accuracy: +/- 2% of reading 
Capacitance (to ground) of Sensor: 3 nF
Sensitivity if used to sense charge: 3.3 kV/nC
Drift: < 0.001 kV/ 10 seconds 
Leakage Half Life: > 10 hours 
Alarm Range: .010 kV - 20 kV / mute 
High-Voltage Alarm: Sounds Automatically > 20 kV 
Sample Speed: 0.0005 sec.  > 98% response for > 0.015 sec. pulse
Auto Off: If no buttons are pressed in 10 minutes 
Environmental: -1 C to 43 C (30°F to 110°F) 0-85% RH
Size:  4.5 X 3 X 1.2 inches; 115 X 72 X 30 mm
Weight: 160 g; 5.5 oz
Battery:  9 Volt Alkaline (~30 hour life) / "Low Battery" indicator

Full details on how to perform these measurements.

This meter is not recommended for long-term automated measurements, such as connection to a data acquisition system. Note that an optional output jack can be ordered, but it is only useful for AC detection, and should be used with an external multimeter or oscilloscope. This meter should be manually reset at least every 20 minutes in case the sensor had acquired any charge, and at very strong ion levels (if a lot of sparking is present), external ions will add enough charge that the reset must be done more frequently. (For a stable electrostatic voltmeter which is chopper stabilized ["field mill"], so it can be used for long-term automated measurements without ever needing to be reset, click here.)

SKU: SVM2 $410

Recalibration service for SVM2: $120

SVM2 Instructions is owned by AlphaLab, Inc. 3005 South 300 West Salt Lake City, Utah 84115 USA