Section
2
Operating lnstructiohs
2-1. INTRODUCTION
24.
Connecting to Line Power
This section proyides instructions for installing and opera-
ting the 8840A. Refer to Section 4 for measurement
WARNING
I
considerations.
TO AVOID SHOCK
HPRD,
CONNECT'
THE INSTRUMENT POWER CORD TO A
I
NOTE
POWER RECEPTAGLE WITH EARTH
Do nor
allow
the meter
to
he
used
if
it is
GROUND. TO AVQlD INSTRUMENTI
damaged
or
its safety is impaired.
DAMAGE, CHECK
HAT
THE REARl
PANEL LINE VOLThGE SELECTION
SWITCHES ARE
SET;
TO THE POWER-'
2-2.
INSTALLATION
UNE
VOLTAGE
IN
$OUR
AREA.
I
2-3.
Installing the Power-Line Fuse
The
8840A
can
be configured to accept line power
07
100,
WARNING
120, 220, or 240V ac (z10%, '250~ maximum) at
50,60,
or
400
Hz.
The voltage must
b$
selected by setting the rear
FOR POWER-LINE VOLTAGES OF
198V
panel
LINE
SET
switches
as
shown in Figure 2-1; The
TO 250V, THE POWER-LINE FUSE
8840A
automatically senses the power-line frequenicy at
MUST
BE
REPLACED
WITH A 1/8A,
power-up, so that no adjustment for frequency
is
qeces-
250V SLO-BU) FUSE FOR FIRE PRO-
sary.
TECTION. TO AVOID ELECTRIC
,
SHOCK, REMOVE THE POWER CORD
2-5. Adjusting the Handle
I
BEFORE REPLACING THE EXTERNAL
The handle provides two viewing angles for bench-to@ use.
LINE
FUSE.
To adjust
its
position, pull the ends out to a hard stop
(about 114 inch on each side)
and
rotate
it
to one df the
T~~
wOA
has
a
rear-panel
power-line
fuse
in
series
with
four stop positions shown in Figure 2-2. To removie the
the power supply.
A
114A, 250V slow-blow fuse is
handle, adjust it to the vertical stop position and pull the
installed in the factory for operation from
90V
to 132V.
ends
'I1
the
way
Out-
For operation with power-line voltages of 198V to 25OV,
the fuse must be replaced with a l/8A, 250V slo-blo fuse.
2-6. Rack Mounting
Kits
You can mount the 8840A in
a
standard l~inch rack
To replace the power-line fuse,
fim
remove the power
panel using the aamOrY rack mowing kits
she+
in
cord. Then turn the rear-panel fuse cover 114-turn counter-
Figure 2-3.
To
install the Single Rack Mount at, rehove
clockwise with a screwdriver.
the handle and handle mountink plates, and attach the/ rack
ears with the screws provided (~igure 2-4).
The
Dual Rack
For power-line voltages
of
198V
to 250V, use only a 114
x
Mount Kit is installed similarly. (Both kits include mbunt-
1
114 (6.3mm
x
32mm) fuse with at
least
a
lOOA breaking
ing instructions.) The
rear
feet may
be
rotated 180 dTrees
capacity.
to clear a narrow rack space.
I
'
2-1
I
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