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Model 3438A
SECTION Ill
OPERATING INSTRUCTIONS
Section 111
3-1. INTRODUCTION.
3-8. Auto.
3-2. 1 his section contains instructions for operating the
Multi~neter. Mcaburements of a c and dc voltage, a c a n d
d c currcnt. and o h m s are discussed. Sample applications
will be given in thih x c t i o n t o demonstrate the use of the
Ill'-ltl. A description of the controls a n d connectors is
givcn in Figure 3-3.
I
WARNING
,
)
To prevent potential electrical or fire hazard,
d o not
e-rpose the
Multimeter or its
accessories t o rain or moisture.
3-3. AC Operation.
3-4. Before connecting the Multimeter t o a c power,
verify that the a c power source matches the power
requirements the Multimeter a s marked o n the option
label affixed t o the rear of the instrument. If the
instrument is incompatible with the available power
source, refer t o Section V of this manual for power
requirement modification instructions. After this
verification, connect the proper ac power t o the
instrument a n d press the O N button. The instrument is
ready for use.
3-5. Overload loverrange /Improper Function
Indication.
3-6. t i g u r e 3-1 shows the display indication during
overload, overrange, or a n improper switch setting.
Figure 3-1. Overload Indication.
3-7. Table 3-1 lists improper switch combinations.
Table 3-1. Improper Switch Combinations.
3-9. Depressing the A U T O switch with acV, dcV o r k R
function selected sets the Multimeter in a n automatic
ranging mode. In this mode the Multimeter will uprange
if the display increases above (+) or (-)
a n d
downrange if the display decreases below
(+)
o r
(-)
.
These numerical autoranging points are
irrespective of decimal placement. T h e difference
between the two autoranging points is called autoranging
I l ~ ~ . s / r ~ r . r ~ . v i s .
Figure 3-2 shows the autoranging points for
d c voltage measurements from 0 t o 1200
V
dc.
Autoranging in other Multimeter functions is similar.
Function
v
- v
mA
- m A
>
>
a
P
>
' D
I
1 .
C
I
I
.
C
E
>
>
>
>
>
-
m
0
?
m
0:
i
8 : :
X
p
E'
E'
2
z
e
4
INPUT LEVEL (
V
d
c
)
P
f
=DOWNRANGE POINT
* =
UPRANGE POINT
Figure 3-2. Multimeter Autoranging.
Range
3-10, T o release the A U T O switch depress o n e of the
M A N U A L R A N G E switches.
mv.a
20
m V , a
20
mv, a
20
3-11. lnput Terminals.
3-12. lnput Selector Switch. T h e Input Selector
M a
20
M n
20
M a
20
M a
20
Switch (front panel) is used t o select front or rear input
terminals. I n the F R O N T position, the V R , C O M , a n d A
input terminals are internally connected t o enable the
u s e r t o m a k e v o l t a g e , c u r r e n t , a n d r e s i s t a n c e
measurements from the front panel. With the Input
Selector switch set t o R E A R , the V R a n d C O M input
terminals o n the rear panel are connected t o allow the
user t o make voltage a n d resistance measurements.
Auto
Auto
NOTE
There is no current measuring capability from
the rear input terminals.
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