PASCO SF-9568A Instruction Sheet

Instruction Sheet
for the PASCO
Model SF-9568A
Student Voltmeter

Introduction

The PASCO Model SF-9568A Student Voltmeter is a
rugged yet sensitive instrument, designed specifically for
student experiments. It has three ranges and is switch
selectable by input jack to measure AC and DC values.
Zero Adjust
Screw

Operation

To zero the meter:
Place the meter in the position (vertical or horizontal)
in which it will be used. Disconnect the meter. Use a
small, standard blade screwdriver to turn the Zero Adjust
Screw (located on the case, below the meter) until the
meter needle is aligned with the zero on the scale.
➤ NOTE: If the meter is mechanically zeroed
in one position, and then the position is changed,
it may need to be zeroed again.
To measure voltage:
x Set the selection switch for AC or DC current. (The
AC setting will provide RMS (root mean square)
readings for alternating current circuits.)
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y Determine the range – For both AC and DC mea-
surements, voltage may be measured in one of
three ranges: 3, 15 and 30 Volts. The range is se-
lected by plugging test leads (not included) into the
appropriate input jack.
➤ NOTE: To protect the meter, always choose a
range that is higher than the highest voltage you
might expect in the circuit.
z
Attach leads to the circuit points between which
you wish to measure the voltage.
For AC measurements –
Plug one lead of the circuit into the black input jack
and the other into the red input jack of the appropri-
ate range.
For DC measurements –
Connect the leads in such a way that positive cur-
rent flows into the black (0) connector on the Volt-
meter .
30 V
15 V
3 V
0
➃ Now you can read the voltage on the meter. A full
swing of the needle corresponds to the value in the
chosen range selection (i.e., On the 3 V range, a
reading of 20 on the upper scale indicates a voltage
of 2.0 volts.).
012-08015A
8/01
Circuit
Direction of
positive
current flow
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