Simpson 260 - Page 37

APPLICATIONS
GENERAL
The Models 260 and 270 are the most versa-
tile pieces of test equipment you can own, having
been designed to measure almost all character-
istics of electrical and electronic circuits.
In D.C. circuits they will measure the
voltage, the current and the resistance, The
measurements are made, throughout a very wide
range, in terms of ordinary units for all values.
Although the upper limit for D.C. voltage with
the 260 or 270 is 5000 volts, accessory multi-
plier probes are available to extend the range
to 25,000 volts. By way of contrast, D.C. cur-
rents as small as 1 microampere can be detected
on the 50 microampere D.C. range.
In A.C. applications, values of voltage as
high as 5000 volts RMS can be measured, using a
full wave rectifier circuit. Decibel readings,
based on the commonly used arbitrary zero level
of 1 milliwatt іп 600 ohms, can also be taken.
With the Output measuring facility, the
А.С. component of a mixed A.C. and D.C. voltage
can be determined. The D.C. portion can be
measured on the D.C. voltage ranges.
Resistance measurements, ranging from
continuity checks down to a fraction of an ohm
to determination of values up to 20 megohms,
are feasible. Using an external voltage source
and the D.C. current ranges (with extreme cau-
tion) checks of insulation resistance are also
possible.
RECTIFIER CHECKS
Forward and reverse resistances of copper
oxide, selenium and crystal rectifiers can be
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