Noise Diagnostic Tools

ELECTRIC AND MAGNETIC FIELD 
NOISE SENSING PROBES

MODELS AVAILABLE AND ORDERING INFORMATION

LOCATE AND SOLVE ELECTRICAL NOISE PROBLEMS WITH THESE PROBES!



EXAMPLE APPLICATIONS:
*Locating the sources of electrical noise.
*Incorrect printed circuit board trace routing.
*Magnetic noise from switch mode power supplies.
*Motor and relay generated noise.
*Use the probe as a noise source to check the susceptibility of a circuit or device.

MAGNETIC FIELD
PROBES

FREQUENCY
RANGE
SIZE
LXD (cm)
CONNECTOR
TYPE
2017
PRICE

MLF-12

40Hz-20KHz

20x1.3

BNC

$135

MLF-11

3KHz-300KHz

19x1.3

BNC

$  95

MHF-21

100KHz-20MHz

19x1.3

BNC

$  95

MHF-22

500KHz-50MHz

19x1.3

BNC

$  95

MHF-23

40MHz-400MHz

19x1.3

BNC

$  95






ELECTRIC FIELD
PROBES

FREQUENCY
RANGE

SIZE
LXD

CONNECTOR
TYPE

2017
PRICE

EWB-11

60Hz-100MHz

19x1.3

BNC

$  75

EWB-12
10MHz-1000MHz
15x1
BNC
$ 115


DELIVERY - PROBES CAN BE SHIPPED WITHIN ONE WEEK AFTER RECEIPT OF ORDER.  THE PRICE INCLUDES NORMAL SHIPPING CHARGES WITHIN THE CONTINENTAL UNITED STATES.

Ordering options

1. Send a check or purchase order to:
VAN DOREN COMPANY
11600 County Road 5180
Rolla, MO 65401

2. Send an order by email to: vandoren@mst.edu

3. To place an order by phone call: 573-578-4193


electric and magnetic field sensing probes

Electric & Magnetic Field Sensing Probes




OPERATING INSTRUCTIONS FOR
ELECTRIC AND MAGNETIC FIELD SENSING PROBES

MODEL NUMBERS:   MLF-12, MLF-11, MHF-21, MHF-22, MHF-23,
EWB-11 & EWB-12

These probes are tools for locating the sources of magnetically or electrically coupled noise.  A coil inside the magnetic probe tip and a metal disk inside the electric probe tip respond to the field component parallel to the probe axis.  An oscilloscope or spectrum analyzer is normally used to monitor the output.  The probe should be held with the tip within two inches of the suspected source of electrical noise.

WARNING - POSSIBLE SHOCK HAZARD - do not use these probes near devices operating at voltages exceeding 200 V. Do not allow the probe to electrically contact any energized device or allow sharp objects to puncture the probe's insulating cover.  Make certain that the probe's BNC output connector is properly safety grounded.

These probes normally generate sufficient output voltage to connect directly to an oscilloscope without any need for preamplification.  If additional sensitivity is required a spectrum analyzer should be used.  The magnetic probe output voltage is proportional to the derivative of the magnetic field.  The electric probe output voltage is directly proportional to the electric field.

Currents and voltages generating electrical interference are easily located with these probes.  The small physical size of the probe permits a precise location of the noise source.  For example, the noise generated by adjacent integrated circuit chips can be individually observed and compared.  The probes are not calibrated.  They are intended to indicate the relative field strength, such as the field before and after a design change.  Most noise detection and reduction procedures do not require an absolute measurement of the field strength.

The maximum cable length connected to any probe operating above 1 MHz should be less than four feet.  Longer cables increase the capacitive loading and reduce the maximum operating frequency.

These probes may also be used to test the noise susceptibility of a circuit or device. By driving the probe with a voltage source, a localized magnetic or electric field can be created at the probe tip.  Critical circuit functions, such as the voltage on an enable line, can be monitored for interference while the probe generated noise is moved over the circuit to locate susceptible devices or wiring.  The maximum voltage applied to the probe should be less than 10 V peak and within the operating frequency range of the probe.