Digital Oscilloscope and Multimeter
with Conductive Microfiber Probe Tips

Is your motor safe from destructive shaft voltages? For the first time you can get all of the tools you need to find out in one place. The AEGIS^® Shaft Voltage Tester™ Digital Oscilloscope bundle includes the AEGIS-OSC-9100 100 MHz digital osciloscope, shaft voltage probe tips, and a shaft grounding simulator. Armed with these tools, you can quickly and easily find whether your motors are at risk of premature bearing failure due to VFD-produced bearing currents.

Overview

Electrical Bearing Damage: Capacitive coupling between windings and rotor can create voltage on a motor's shaft — voltage that can discharge through bearings, damaging them and shortening motor life. For motors controlled by variable frequency drives, however, these voltages can be as high as 10-40 volt peak. At these higher levels, voltages can easily cause electric electrical discharge in the motor bearings, causing pitting, fusion craters, and fluting, which eventually lead to premature bearing and motor failure.

Until now, the only way to tell whether a motor was at risk for such bearing damage was to buy, rent, or borrow an oscilloscope and then buy some type of shaft voltage probe. Now, for the first time, there is a total shaft voltage detection system available in one package.

With the AEGIS^® Shaft Voltage Tester™ Digital Oscilloscope, plant maintenance personnel can take shaft voltage readings from motor shafts quickly and easily – readings that confirm or deny the presence of shaft voltage discharges that can damage motor bearings.  Users who already have a 10X oscilloscope with bandwidth at least 100 MHz may be able to measure shaft voltage with it and an appropriate set of our Shaft Voltage Probe™ Tips. 

Note: For motors powered off the line by sine wave AC power, these voltages are typically 100-200 millivolts at 60/50 Hz and will not cause problems with electrical bearing discharges.

The following equipment is required to test for damaging shaft currents:

Recommended Testing Equipment

• Oscilloscope with a 10:1 probe. We recommend a minimum bandwidth of 100 MHz to accurately measure the shaft voltage waveform.
• *Recommended: AEGIS SVP Shaft Voltage Tester with Shaft Voltage Probe Tips, Magnetic Base, and Shaft Grounding Simulator PN: AEGIS-OSC-9100MB-W2

Part Number Comparison

The part numbers in the table below are for North American customers only. For intercontinental customers, only scopes with two-year warranties are available. The intercontinental part numbers for uncalibrated scopes have an added -I suffix: AEGIS-OSC-9100-W2-I and AEGIS-OSC-9100MB-W2-I. The part number for the calibrated Tester™ is the same as for North American customers. All part numbers with a -I include a universal power adapter kit to fit regional electric sockets.

Documentation

Instructions
	Measuring Shaft Voltage with the AEGIS Shaft Voltage Tester - Excerpt from Edition 3 of the AEGIS Bearing Protection Handbook
	AEGIS Shaft Voltage Tester Training Presentation
	Shaft Voltage Testing Report Template
	YouTube Playlist on Shaft Voltage Tester Setup
Manuals & Specifications
	AEGIS OSC-9100 Manual
	AEGIS Shaft Voltage Tester Datasheet(North American) International Version
	Specifications
	Factory Settings
	Lithium Ion Battery Safety Data Sheet
	Lithium Ion BatterynUN 38.3 Test Summary

Accessories

AEGIS SVP Shaft Voltage Probe Tips & Accessories

AEGIS SVP accessories can be used with any 10:1 oscilloscope with bandwidth at least 100 MHz and a BNC connector.

SVP-KIT-9100MB includes: 3 SVP Tips, probe holder with two-piece extension rod (total length of probe holder plus rod of 18 inches), magnetic base, and Grounding Simulator. AEGIS-SVP-510 includes: an AEGIS Voltage Probe (CAT II 300V) with BNC connector and AEGIS SVP Tip, and an alligator ground clip (not pictured). SVP-TIP-9100 3 replacement SVP Tips. PWS-9100 Replacement AC power adapter for AEGIS-OSC-9100. Input: 110-240V ac, 1.2A, 50-60Hz; output: 9V dc, 4A.