Fluke 8508A - 2 Theory of Operation; Overall Functional Description

2
Getting Acquainted with the Basics
Rear Panel
Rear Panel
RL1 PP0 DC1 DT1 C0 E2
TRIG
5V PK MAX
REAR INPUT
CURRENT
FUSE.
F1.6AH,
250V
5 x 20mm
IEC127
CALIBRATION
ENABLE
DISABLE
POWER INPUT 80 VA MAX. 50 - 60 Hz
115
230
T1.25AH 250V
LINE VOLTAGE
SELECTION
FUSE 5 x 20mm
IEC127
T1.25AH 250V
LINE VOLTAGE
100V - 120V
200V - 240V
LISTED. 3012749
NOTE
CONFORMS TO UL STD. UL61010-1:2004
CERTIFIED TO CAN/CSA STD. C22.2 No.61010.1-04
AUX EARTH (GROUND)
MADE IN UK
FLUKE CORPORATION
www.fluke.com
NO USER SERVICEABLE PARTS CONTAINED. DO NOT REMOVE THE COVERS.
REFER SERVICE TO QUALIFIED PERSONNEL.
C
1
adj018f.eps
Figure 2-4. 8508A Rear Panel Detail
Labels
Attached to the rear panel is the identification label for the instrument, and a modification
strike label.
Fuses

Power Fuse: Located in the fuse drawer which is part of the integrated module for
power input and voltage selection.

Rear Input Current Fuse: Protects the current measuring circuitry when using the
rear terminals for signal input.
Warning
To avoid damage to the Multimeter, or shock, injury, or death, use
ONLY fuses with the amperage, interrupt, voltage, and speed ratings
specified.
Refer to the safety information and "Fuse Requirements" in Chapter 1
of this manual.
Voltage Selector
The power line voltage selector block is located behind the fuse block drawer, and adapts
the instrument to either 115V or 230V line inputs.
Power Input and Power Switch
The power input socket and power ON/OFF switch are part of the integrated module for
power input and voltage selection. Power on default configuration is listed later in this
chapter.
Calibration Switch
Access to calibration mode is enabled (or restricted) by the rear panel calibration switch.
Setting the switch to
ENABLE will allow access to the calibration mode via the front
panel
CAL key and the CALIBRATION menu, and will also enable the remote IEEE-488
interface calibration commands.
The calibration switch should always be set to DISABLE on completion of any
calibration operations. Applying an integrity seal or calibration sticker to cover the rear
panel Calibration switch is a convenient way to ensure the security of calibration and
prevent unauthorized access to the switch.
2-7