Simpson 260 Series 8 - Output Voltage Measurement and Frequency Response; Decibel Measurement (−20 to +50 dB)

22
Before proceeding with the fol-
lowing steps, review the Safety
Precautions in Paragraph 4.1.
a. Set the function switch to
AC volts only position (Fig-
ure 4-9).
b. Plug the black test lead into
the -COMMON jack and the
red test lead into the OUT-
PUT 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 mea-
sured with the black test lead
to the ground side.
e. Turn on the power in the test
circuit. Read the output volt-
age on the appropriate 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.
4.14 Decibel Measurement (–20 to +50 dB)
Some industries measure in
terms of voltage or current ratios
(decibels) based on a specific
reference level. The dB scale on
the 260-8 serves this purpose
and is calibrated to a reference
level (zero dB) of 0.001 watt into
600 ohms. The scale calibration
of –20 to +10 dB is for the 0-2.5V
range (zero dB = 0.775V).
Higher ranges may be used by
adding an appropriate dB value
to the reading in accordance with
the chart on page 23.
a. Review the safety precau-
tions in paragraph 4.1.
b. Refer to Figure 4-10 for
switch settings and jack
connections.
2.5 V.
10 V.
1V.
25 V.
50 A.
␮ AMPS.
250 V.
500 V.
I000 V.
OUTPUT
350 VDC
MAX.
COMMON
-
A.C. VOLTS
ONLY
A
.C.
A.C
.
260
ALL TERMINALS 1 V MAX
500 MA.
2.5 V.
10 V.
1V.
25 V.
50 A.
␮ AMPS.
250 V.
500 V.
I000 V.
OUTPUT
350 VDC
MAX.
COMMON
-
A.C. VOLTS
ONLY
A
.C
.
A.C
.
2.5 V.A.C.
260
ALL TERMINALS 1 V MAX
Figure 4-9. Jacks and Switch Positions for
Output Measurements
Figure 4-10. Jacks and Switch
Positions for Measuring
Decibels.