Gamry Reference 3000 - Fuses Located in the Cable Hood

Chapter 5 -- Cell Connections--Fuses in the Cell Cable
5 - 6
ohmmeter, such as that found on modern digital voltmeters. Do not trust a visual inspection of the fuse. A
blown (open) fuse should always have a resistance of greater than 100 Ohms. The resistance of a good fuse is
very small.
Figure 5-1
Open Fuse-holder Showing Fuse
Four replacement fuses should accompany every cell cable shipped by Gamry Instruments. The Gamry
Instruments Part Number for the in-line fuses is 630-00019. If you need to source replacement fuses locally,
we currently only recommend Fast Acting (FF), 3.15 amp, 5x20mm cylindrical fuses from the Bussman
Corporation. The Bussman Part Number is BK/GMA-3.15-R. Fuses with similar ratings from other
manufacturers have not been tested, so we cannot recommend their use.
Fuses Located in the Cable Hood
The in-line fuses in the Counter/Working are expensive and large enough to be awkward, especially when low
impedances connections are required. Newer Counter/Working cables use a simple design with fuses located
within the cable hood. This approach is less expensive and allows for lower inductance cell connections
NOTE
Always turn off the Reference 3000 and disconnect both ends of the Counter/Working
cable before checking or replacing the fuses in the cable.
Access to the fuses requires removal of two screws located on opposite sides of the hood covering the
D-connector end of the Counter/Working cable. A drawing of the D-connector end of a cable with the hood
opened is seen in Figure 5-2. The small rectangular fuses snap into fuse-holders labeled Work and Cntr. To
remove the fuse, either grip it with small pliers and gently lift the fuse out of the fuse-holder, or pry the fuse out
of the fuse-holder using a small screwdriver or knife blade.
CAUTION
Always replace the fuses in a Reference 3000 cable with the recommended
fuse. Use of improper fuse, especially a fuse with a higher current rating,
could cause instrument failure if a battery cell is improperly connected. Use
of a non-approved fuse will void Gamry’s factory warranty.