13
12
2. Step by Step Procedures:
a. Measuring DC Volts
WARNING!
Do not attempt to make a voltage measurement of
more than 600V or of a voltage level that is unknown.
Instrument set-up:
FUNC.
BLACK RED
MIN
MAXI
TEST LEAD TEST LEAD
READING
READING
V
COM
V/
Ω
0.1mV
750V
Measurement Procedure:
1.
Disconnect power to circuit to be measured.
2.
Plug black test lead into the
COM
input jack.
3
Plug red test lead into the
V/
Ω
input jack.
4.
Set rotary switch to the appropriate
V
range.
5.
Connect test leads to circuit to be measured.
6.
Reconnect power to circuit to be measured.
7.
Read the voltage on the 291.
Optional Modes
•
HOLD:
Freezes the reading on the LCD.
•
PEAK:
Measures the peak voltage.
!
Application Notes
When measuring DC Voltage of a bat-
tery, the most accurate reading can be
attained by testing the battery under
load. To accomplish this, follow steps
1 through 4 shown on page 13 and
the following (with the battery in
holder and device turned on):
• Connect the red test lead from the
meter to the positive (+) terminal
of the battery.
• Connect the black test lead to the
negative (-) terminal of the battery.
• Reconnect power to the circuit and
read the voltage on the 291.
