Simpson 260-8P, Инструкция по эксплуатации, Страница: 13 / 32

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3. Function Switch: The function switch has four positions: Audio “ ”, +DC, -
DC, and AC Volts only. To measure DC current or voltage,
set the function switch at the -DC or +DC position, depend-
ing 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 ohmmeter battery voltage will be as marked at the
jacks when the switch is in the +DC position and reversed
in the -DC position.
4. Zero Ohms: This control is used to compensate for variation in the volt-
age of the internal batteries, when making resistance mea-
surements.
5. Circuit Jacks: There are eight jacks on the front panel marked with the
functions they represent. These jacks provide the electri-
cal connections to the test leads. The COMMON (-) jack is
used (in conjunction with the black test lead) as the refer-
ence point for the measurement of all the functions with
the exception of the 10 A range. (Refer to Section 4 for
details.)
6. Pointer Adjust
For Zero:
With the Volt-Ohm-Milliammeter in an operating position,
check that the pointer indicates zero at the left end of the
scale when there is no input. If pointer is off zero, adjust the
screw located in the cover below the center of the dial. Use
a small screwdriver to turn the screw slowly clockwise or
counterclockwise until the pointer is exactly over the zero
mark at the left end of the scale. With the indicating pointer
FIGURE 3-1. Front Panel Controls, Jacks
and Indicators
D.
C.
D.C
.
500 MA.
2.5 V.
10 V.
1V.
25 V.
50 A.
AMPS.
250 V.
500 V.
I000 V.
100MA.
10MA.
AMPS.
1MA.
R x 1
R x I0,000
ZERO OHMS
-10 A.
OUTPUT
350 VDC
MAX.
+
COMMON
-
A.C. VOLTS
ONLY
- D.C.
+ D.C.
A.C
. A.C
.
OHMS
OHM
S
2.5 V
.A
.C
.
DB
260
ALL TERMINALS 1 V MAX
6
4
2
5
3
R X I00
500 V.
A.C. D.C.
1000 V.
A.C. D.C.
+1V.
+10A
50 AMPS.
250 MV.
+
1
7