22
2.5 V.
10 V.
1V.
25 V.
50 A.
AMPS.
250 V.
500 V.
I000 V.
+
COMMON
-
A.C. VOLTS
ONLY
D
B
260
ALL TERMINALS 1 V MAX
D.C
.
D.C.
500 MA.
50 A.
AMPS.
100MA.
10MA.
AMPS.
1MA.
-10 A.
OUTPUT
350 VDC
MAX.
+
COMMON
-
A.C. VOLTS
ONLY
- D.C.
+ D.C.
OFF
260
ALL TERMINALS 1 V MAX
+1V.
+10A
50
AMPS.
250 MV.
+
FIGURE 4-10. Jacks and Switch
Positions for Measuring Decibels.
FIGURE 4-11. Jacks and Switch
Positions for Measuring Direct Current
4.14 Output Voltage Measurement
It is often desired to measure the AC component of an Output Voltage where both
AC and DC voltage levels exist. This occurs primarily in amplifier circuits. The
260-8 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 frequencies but is usually
ignored at audio frequencies (Figure 4-8).
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 Para-
graph 4.2.
a. Set the function switch to AC volts only position (Figure 4-9).
b. Plug the black test lead into the -COMMON jack and the red test lead into the
OUTPUT jack.
c. Set the range switch at one of the range positions marked 2.5V, 10V, 25V,
50V, or 250V.
d. Connect the test leads across the circuit being measured with the black test
lead to the ground side.
e. Turn on the power in the test circuit. Read the output voltage on the appropri-
ate AC voltage scale. For the 0-2.5V range, read the value directly on the
scale marked 2.5 VAC. For the 10V, 25V, 50V, or 250V ranges, use the red
scale marked AC and read the black figures immediately above the scale.
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