Simpson 270 Series - Controls, Jacks, and Таса

SECTION ІІ
CONTROLS, JACKS, AND INDICATORS
3.1 GENERAL
3.1.2 All operating and adjustment controls, jacks and indicators
for the Simpson 270-5 are described in this section along with a list
(Table 3-1) describing their function. Become familiar with each
item prior to operating the Instrument.
3.2 FRONT PANEL DESCRIPTION
3.2.1 Description of front panel controls, jacks, and indicators
is as follows:
NOTE: The items called out in Figure 3-1, correspond
with the numerical order of the items listed in
Table 3-1.
TABLE 3-1. CONTROLS, JACKS. AND INDICATORS
. Front Panel: The 270-5 Volt-Ohm-Milliammeter is a large, easy-to-
read 414 inch indicating Instrument. Below the In-
strument are three controls and eight circuit jacks.
Switch positions and circuit jacks are marked in white
characters for easy reading.
ке
to
Range Switch: Has 12-positions: May be turned in either direction.
There are 5-voltage positions, 4-direct current posi-
tions, and three resistance positions used to select
desired ranges.
3. Function Switch: The function switch has four positions: Off/Transit,
+DC, —DC and AC. To measure DC current or volt-
age, set the function switch at the —DC or +DC po-
sition, depending on the polarity of the signal applied
across the test leads. To measure AC voltage set the
function switch to the AC position. For resistance
measurement, the switch may be set in either the
+DC or —DC position. The polarity of the internal
3-1