PASCO EM-8812 Resistance Apparatus - Manual (Page 5)

®
M o d e l N o . E M - 8 8 1 2 A p p a r a tu s S e t u p
5
22
RESIST RESISTANCE ANCE APP APPARA ARATUS TUS
0 4 24 1 2 3 5 6 7 9 8 10 11 12 13 14 15 16 17 18 19 20 21 23 cm
To voltmeter or galvanometer
To power supply
Current
small resistance to be measured even if the resistances of the four measurement wires
are much higher, unknown, or variable.
Apparatus Setup
Wire Installation
1. Move the reference and slider probes to the extreme left and right positions so
they are parked on the ramps that will hold them out off the wire.
2. Loosen the wire clamps.
3. Insert the wire through the clamps and under the probes, as shown in the dia-
gram. Observe the alignment lines marked near the wire clamps and note that the
wire goes through the front of the left-hand clamp and through the back of the
right-hand clamp. (This configuration causes the wire to be pulled tight when the
clamps are closed.)
4. Tighten both clamps enough to secure the wire in place.
5. To remove the wire, park the probes and loosen the clamps.
External Device Connections
1. Power Supply: Set
the voltage of the
power supply to zero.
Connect it to the
power jacks of the
apparatus (see dia-
gram) so that the cur-
rent will flow from
right to left through
the wire.
2. Current Measurement: If you plan to use a current sensor or meter, connect it
in series with the apparatus.
3. Voltage Measurement: Connect Galvanometer Sensor or voltmeter to the jacks
on the reference probe (-) and slider probe (+).
22
RESIST RESISTANCE ANCE APP APPARA ARATUS TUS
0 4 24 1 2 3 5 6 7 9 8 10 11 12 13 14 15 16 17 18 19 20 21 23 cm
Sliders in “parked” possitions
Alignment
lines
Alignment
lines
Insert wire here
Wire clamps