PASCO SF-9568A Instruction Sheet

Heavy Duty Voltmeter

Introduction

The PASCO Model SF-9568A Heavy Duty Voltmeter is a rug-
ged yet sensitive instrument designed specifically for student
experiments. It has three ranges and is switch selectable by
input jack to measure AC or 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 e is aligned
with zero on the scale.
.
NOTE: If the meter is zeroed in one position and the
position is changed, it may need to be zeroed again.
To measure voltage:
1. Set the selection switch for AC or DC voltage. (The AC set-
ting will provide root-mean-square (RMS) readings for alter-
nating current circuits.)
®
SF-9568A
2. Determine the range. For both AC and DC measurements,
voltage may be measured in one of three ranges: 3 V, 15 V,
and 30 V. The range is selected by plugging leads (not
included) into the appropriate input jack.
.
NOTE: To project the meter, always choose a range
that is higher than the highest voltage you might expect
in the circuit.
3. 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 lead into the red input jack of the appropriate range.
For DC measurements
Connect the leads in such a way that positive current flows into
the black input connector on the voltmeter.
4. Now you can read the voltage on the meter. A full swing of
the needle corresponds to the value in the chosen range
selection. For example, on the 3 V range, a reading of 20 on
the upper scale indicates a voltage of 2.0 V.
Instruction Sheet
012-08015B
*012-08015*
Direction of positive
current flow