WARNING

FLUKE digital multimeter (DMM) Owners & Users:

We have become aware of a product malfunction in certain FLUKE DMMs. This problem is the result of manufacturing change implemented in July, 1994. Only seven models are affected: the Fluke Series II Model 21, 23, KIT 23, 70, 73, 75, and 77 meters imprinted on the case bottom with serial numbers between 6099000 and 63752000. No other Fluke instruments are affected. If the S/N of your DMM is preceded by a "9" or followed by an "R", this notice does not apply.

The malfunction may occur when a voltage input greater than 400 Vdc is applied in either voltage functions, AC or DC. The meter may go into a lock-up state and will indicate a reading of (or near) zero volts. WHEN THE MALFUNCTION OCCURS, THE METER MAY NOT INDICATE THAT HIGH VOLTAGE IS PRESENT, PLACING THE USER IN A POTENTIALLY HAZARDOUS SITUATION. The failure mode commonly occurs when the positive lead (red) is connected first to a high voltage supply and then the common (black) lead is connected.

To correct this problem Fluke will modify your meter without charge. Even if you normally do not use your meter in the voltage range mentioned, it is recommended that you return your meter for modification.

If you are not the primary user of the affected Fluke DMM, please make every effort to pass this notice to the appropriate people within your organization.

Please send your meter to your Fluke Service Center to have this modification completed. Your unit will be modified and on its way to you within a few days.

The place to send your meter is:

Fluke Technical Service

1150 W. Euclid Avenue, MS 70S

Palatine, IL 60067-7397

Telephone: 1-800-323-5700

The information to include when you return your DMM is as follows:

Name, Mail Stop

Company Name

Street Address

City, State and Zip Code

Telephone Number

Model Number, Serial Number