Range Doubler Multitester  (220-0215)    Preparation   Faxback Doc. # 6539

INSTALLING/REPLACING THE BATTERIES

You need to install one 9V battery (Cat. No. 23-583 or 23-553) for the
20 M Ohms (x 10k) and the continuity range, and one 1.5V AA battery
(Cat. No. 23-582 or 23-552) for other resistance measurements.  Follow
these steps to install fresh batteries.

1.  Disconnect the test leads from the circuit you are measuring.

2.  Set the range switch to OFF.

3.  Open the cabinet by removing the screw from the back, and remove the
    old batteries, if necessary.

4.  Install the batteries as indicated by the polarity symbols (+ and -)
    in the battery compartment diagram.

5.  Close the cabinet and replace the screw.

Replace the batteries if:

  You cannot bring the pointer to 0 on the OHMS scale on each range of the
  Ohms function by touching the test lead tips together.

  The buzzer does not sound on the CONT range when you touch the test lead
  tips together.

Cautions:

  Never leave weak or dead batteries in your tester.  Even leak-proof
  batteries can leak damaging chemicals.

  Remove the batteries if you do not plan to use the tester for a week or
  more.

REPLACING THE FUSE

The tester uses an internal fuse to prevent an accidental voltage
overload.  The fuse blows if voltage is applied when the tester is in the
OHMS or current range (except the 10A range), or when excess voltage is
applied in the 0.25 DCV/0.125 DCV range.  When the fuse blows, the meter
stops working.

Warning:  To avoid electric shock, disconnect the test leads from the
          circuit under test before removing the fuse.

Caution:  For continued protection, replace with a fuse of the same
          type and rating.  We recommend a 0.5A/250V fuse such as
          Cat. No. 270-1271.

To replace the fuse:

1.  Disconnect the test leads from the circuit under test.

2.  Set the range switch to OFF.

3.  Open the tester cabinet by removing the screw from the back.

    There are two fuses in the tester.  The circuit fuse is in the metal
    fuse holder on a board with a red ribbon ring around it.  Check this
    fuse when the tester stops working.

4.  Remove the blown fuse by pulling the red ribbon ring.

5.  Place the ribbon on the replacement fuse.

6.  Insert the replacement fuse into the metal fuse holder.

7.  Close the tester cabinet and replace the screw.

(BR/all-06/23/94)