Replacing Or Checking The Ac Power Fuses - Gamry Instruments Reference 30k Booster Operator's Manual

Safety Considerations – Replacing or Checking the AC Power Fuses
Caution:
line fuses can cause opening of a fuse. This problem is seen when operating the instrument with 115 VAC
power and fuses appropriate for 240 VAC operation. Any open fuses must be replaced before the
instrument will resume operation.
The Reference 30k Booster depends on fuses in the AC line (mains) input to prevent electrical shock and fire
hazards in the unlikely case of a catastrophic failure of the power supplies. Two fuses are used, one for each
side of the AC line. The Reference 30k Booster uses "European Style" 5 mm × 20 mm cylindrical fuses. Time-
lag fuses that are designed to meet IEC Publication 60127-2 are required. We recommend Schurter FST series
fuses as replacements.
If you are uncertain which fuses are installed in your Reference 30k Booster, check the fuse-rating printed on
the fuses. See the next section for step-by-step instructions for checking or changing the AC line fuses in a
Reference 30k Booster.

Replacing or Checking the AC Power Fuses

This section of the Reference 30k Booster manual gives step-by-step instructions for checking or changing the
AC power fuses in your Reference 30k Booster. Please follow these instructions carefully. You need a small flat-
bladed screwdriver to perform this procedure.
1) Unplug the AC power (mains) cord from the back of the Reference 30k Booster. The fuses cannot be
changed with the AC line (mains) cord plugged into the Reference 30k Booster.
2) Locate the AC input module on the lower left-hand corner of the Reference 30k Booster rear panel. It
can be identified by the power-cord connector built into it.
3) Find the small slot on the top of the AC input module. Use the blade of a small screwdriver to pry
open the door on AC input module.
4) The fuses are contained inside a fuse holder. Use the blade of a small screwdriver to pry the fuse
holder out of the AC input module.
5) Remove the old fuses by prying them out of the fuse holders. Replace them with the correct fuses,
which pop into the fuse holders. The fuse holder allows for both US and European fuses. The
European 5 × 20 mm fuses supplied with the instrument mount toward the interior end of the fuse
holder. Note that only one end of the fuse clips into the fuse holder: see the photograph in Figure 1-1.
The current-rating of the fuses is printed on the metal ends of the fuse. Make sure that your fuses are
the appropriate value for your AC power-line voltage.
Operating a Reference 30k Booster at high output current with incorrect power-
9