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Model 3465B
Section ill
SECTION
III
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.
3-2. This section contains instructions for using the Multi
meter for making dc voltage, ac voltage, dc current, ac
current and ohms measurements. The section also contains
a description of the front and rear panel features.
WARNING
To prevent potential electrical or fire hazard,
do not expose the Multimeter or its accessories
to rain or moisture.
3-3. Front Panel Features.
3-4. An illustration and description of the front panel is
provided in Figure 3-1. All controls and connectors are
identified and briefly described.
3-5. Turn-on and Warm-up.
3-6. For specified measurement accuracy, allow the instru
ment to warm-up for at least 10 minutes.
Before connecting the instrument to ac power,
verify that the ac power source matches the
power requirement of the instrument as marked
on the option label affixed to the rear of the
instrument.
3-7. Internal Battery Voltage Measurement and Recharg
ing.
3-8. The Multimeter contains a feature allowing the user to
check battery strength to determine the need for battery
recharging. The procedure is to place the Multimeter in the
DCV function and depress the 10 megohms range switch. If
the absolute value of the front panel display is .380 or less,
recharge the batteries. Recharging of the NiCad batteries is
performed by operating the Multimeter on an ac source.
Measurements can be made with the Multimeter operated
from the ac source during the recharging period.
NOTE
After 8 hours, a completely discharged battery
will be fully charged with ac line voltage con
nected and the POWER switch off. Shorter
charge periods will allow reduced battery
operating time. There is no danger of over
charge. For convenience, overnight charging is
recommended.
3-9. Low Battery Voltage Detection.
3-10. A battery source safety feature of the Multimeter is
low battery voltage detection circuit which turns the instru
ment off when battery voltage reaches a low level. This
protects against cell reversal of the NiCad batteries. If
during operation the display disappears or immediately
after turn-on the display appears and disappears after
several seconds, low battery voltage is indicated. To verify
low battery voltage, the procedure described in the pre
ceding paragraph can be used or verify by placing the OFF/
ON switch to OFF and to ON again. The display will appear
and again disappear. Operation from an ac line source and
recharging of the NiCad batteries is required when this
occurs.
NOTE
In protecting batteries and circuitry, the low
battery voltage detection circuit may shut
down the instrument if the power switch is
momentarily turned off then back on. To
restore
normal operation, the instrument
should be turned off with the front panel
power switch for a minimum of 3 seconds.
3-11. Overload Indication.
3-12. The Multimeter is capable of displaying 19999 for all
functions and ranges. There are maximum voltage limita
tions in DCV and ACV, however (see ac and dc voltage
measurement paragraphs). In an overload condition where
the input exceeds 19999, the last four digits blank and the
overrange "1" and decimal point will be displayed. The
polarity sign is also displayed in the dc volts and dc current
functions in the overload condition.
3-13. AC VOLTAGE MEASUREMENTS.
A
Maximum input voltage in the ACV FUNC
TION is 500 V rms, 800 V peak and 600 V dc.
Do not exceed these voltages or damage to the
instrument will occur.
3-14. AC Voltage Ranges.
3-15. The ACV FUNCTION has five ranges from 200 mV
to 500 V. Each range has a maximum display reading of
3-1
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