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Model 3476A
Section III
SECTION
III
OPERATING
INSTRUCTIONS
3-1. INTRODUCTION.
3-2. This section contains instructions for operating the
Multimeter. Measurements of ac and dc voltage, ac and dc
current, and ohms are discussed.
A
description of the con-
trols and connectors is given in Figure 3-8.
WARNING
1
To prevent potential electrical or fire hazard,
do not expose the Multimeter or its accessories
to rain or moisture.
3-3. TURN- ON.
3-4. Before connecting the Multimeter to ac power, verify
that the ac power source matches the power requirements
of the Multimeter by referring to the power requirement
label located below the ac receptacle. If the instrument is
incompatible with the available power source, refer to Sec-
tion V of this manual for power requirement modification
instructions. After this verification, connect the proper ac
power to the instrument and press the ON button. The in-
strument is ready for use.
3-5. OPERATION.
3-6. Overload/Overrange Indication.
3-7. Figure 3-1 shows the display indication during an
Overload/Overrange condition.
Figure 3-1. Overload Indication.
3-8. Auto/Hold Switch.
3-9. In the AUTO position (out), the Multimeter is in the
Autoranging mode. In this mode the Multimeter will up-
range if the display reading increases above « MOD and
downrange if the display decreases below MUM . These
numerical autoranging points are irrespective of decimal
placement. The difference between the two autoranging
points is called the autoranging hysteresis. Figure 3-2 shows
the autoranging points for dc voltage measurements from 0
to 1000V dc. Autoranging in other Multimeter functions is
similar.
o
o
A
o
o
1.1 -
JAIF
:
j
.11
0
o
o
CD
Ch
•
INPUT LEVEL ( Vdc)
711 -
HSI
Figure 3-2. Multimeter Autoranging.
3-10. In the HOLD position (IN) the Multimeter will re-
main in the same range as when the switch was depressed.
NOTE
With the Multimeter in the HOLD position,
maximum input levels as described in Table 1-1
can safely be input regardless of the range
selected. If the input level exceeds al 111 01 9181
display indication, an overload condition will
be displayed without damaging the Multimeter.
3-11. AC Voltage Measurements.
To avoid possible damage to the Multimeter
circuitry, the ac input voltage must not exceed
707 V rms.
3-12. Set the Multimeter front panel controls as follows:
DC/AC
(=
)
— ( IN)
VOLTS (V)
( IN)
AUTO HOLD
AUTO ( OUT)
AMPS (A) AND 1d2
(OUT)
3-13. Connect test leads from the Multimeter V 1
-
2 ( HI)
and COM (LOW) connectors to the voltage under test as
shown in Figure 3-3.
3-1
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