8-6
Section 8: Model 9100 — Routine Maintenance and Test
Final Width = 215mm
8.2.4
Output Fuse Replacement
Warning!
Fuse replacement should be carried out by a suitable skilled and competent person.
8.2.4.1
Introduction
The Model 9100 outputs are protected by internal fuses.
Access to five fuses is provided:
•
The Hi and Lo Terminal lines are protected by two fuses, concealed behind a small cover underneath the instrument.
•
The I+ and I- Terminal lines are protected by three fuses which protrude through the top guard shield under the top cover.
The following paragraphs deal with diagnosing blown output fuses, access and procedures for replacement.
8.2.4.2
Replacement Fuses
The following fuses can be ordered through your
Fluke
Sales and Service Center:
8.2.4.3
Diagnosing Blown Output Fuses
1. Hi and Lo Terminal Fuses
These fuses are placed in the Hi and Lo output lines, between the
final output switching relays and the terminals. Suspect that
these fuses have blown, if the output from the terminals is
grossly incorrect, but the Self Test indicates no fault.
2. I+ and I- Terminal Low Current Fuses
(when operating in AC or DC Current function, except for the
3A and 20A Spans)
These fuses are placed in the output lines for I+ and I-, except
when the 3A and 20A Spans are in use. The positions are shown
on the top inside cover. If either has blown, the over-compliance
error message will be generated.
3. I+ Terminal High Current Fuse
(when operating in AC or DC Current function, working in the
3A Span)
This fuse is placed in the output line for I+, only when the 3A
Span is in use. The position is shown on the top inside cover. If
it has blown, the over-compliance error message will be
generated.
4. In General:
Sometimes a blown fuse can cause a 'Fatal Error' (refer to
Appendix A to this Section 8).
The internal fuses are unlikely to be blown as a result of an
internal fault. The most likely cause of failure is the inadvertent
application of power from an external source.
The 20A Span is driven from a separate heavily-protected
output stage, and the output is not fused.
Function
Part No.
Description
IEC Designation
Manufacturer
Type
Hi Terminal Fuse
920293
500mA 250V TR5 (F)
F0.5AL
Wickmann
19370-500
Lo Terminal Fuse
920293
500mA 250V TR5 (F)
F0.5AL
Wickmann
19370-500
I- Terminal Fuse (Low Currents)
920208
1A 250V 20mm (F)
F1AL
Belling Lee
L1427B/1A
I+ Terminal Fuse (Low Currents)
920294
500mA 250V 20mm (F)
F0.5AL
Schurter
0034.1513
I+ Terminal Fuse (High Currents)
920295
4A 250V 20mm (F)
F4AL
Schurter
0034.1522