12391 NIST CAL CERT Simpson, 12391 NIST CAL CERT Datasheet - Page 21

• Manufacturer Part Number: 12391 NIST CAL CERT
• Description: Analog Multimeters 260-8P VOM NIST CAL CERT W/O DATA
• Manufacturer: Simpson

Specifications of 12391 NIST CAL CERT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.7
Be sure that the range switch is set to the 250V/500V/1000V range, function
switch to AC position, and test leads connected to common and 1000V jack.
Do not touch the Instrument or test leads while the power is on in the circuit being
measured.
Before proceeding with the following steps, review the Safety Precautions in
Paragraph 4.2.
a.
Only position. (Figure 4-8).
NOTE: The meter will not indicate if the
switch is incorrectly set to a DC position.
b.
c.
d.
e.
f.
g.
Certain situations necessitatethe measuring of the AC component of an Output
Voltage where both AC and DC voltage levels exist. This occurs primarily in
amplifier circuits. The 260-8P has a 0.1 mfd, 400 volt capacitor in series with the
OUTPUT jack. The capacitor blocks the DC component of the current in the test
circuit, but allows the AC or desired component to pass on to the indicating
instrument circuit. The blocking capacitor may alter the AC response at low fre-
quencies but is usually ignored at audio frequencies (Figure 4-9).
Do not connect the OUTPUT jack to a circuit in which the DC voltage component
exceeds 350V.
Before proceeding with the following steps, review the Safety Precautions in
Paragraph 4.1.
a.
b.
c.
d.
Set the function switch at AC Volts
Set the range switch at the 250V/500V/
1000V position.
Plug the black test lead into the -COM-
MON jack and the red test lead into
the 1000V jack.
Be sure power is off in the circuit be-
ing measured and that all its capaci-
tors have been discharged.
Connect the test leads across the cir-
cuit voltage to be measured with the
black lead to the grounded side.
Turn on the power in circuit being mea-
sured.
Read the voltage on the red scale
marked AC. Use the 0-10 figures and
multiply by 100.
Output Voltage Measurement
Set the function switch at AC Volts Only position. (Figure 4-10).
Plug the black test lead into the -COMMON jack and the red test lead into the
OUTPUT jack.
Set the range switch at one of the range positions marked 2.5V, 10V, 25V,
50V, or 250V.
Connect the test leads across the circuit being measured with the black test
lead to the grounded side.
21
Figure 4-8. Jacks and Switch
Positions for Measuring
AC Voltage, 0-1000V Range
A.C. VOLTS
COMMON
ONLY
-
250 V.
500 V.
I000 V.
ALL TERMINALS 1 V MAX
260
A.C. D.C.
1000 V.