PASCO ES-9078 Instruction Sheet

Basic electrometer

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Instruction Sheet
for the PASCO
Model ES-9078

Introduction

The Model ES-9078 is a voltmeter used for direct
measurements of voltage and indirect measurements
of current and charge. Because of its high ("infinite")
14
impedance of 10
ohms, it is especially suited for
Measuring Charge in electrostatic experiments. It has a
sensitivity nearly 1000 times that of a standard gold-
leaf electroscope, a center-zero meter that directly
indicates charge polarity, and measures charges as
-11
low as 10
coulombs.
With these features, you'll find that your electrostatics
demonstrations and labs are easier to perform and,
with quantitative data, are more informative.
The electrometer is powered by four AA-alkaline
batteries, easily replaced by opening the back casing
of the electrometer.
BASIC ELECTROMETER
When replacing batteries, do not touch any
of the components or wires in the integrated
circuit panel; the components and
wires are all static sensitive.
EQUIPMENT
Parts included:
• Basic Electrometer (ES-9078)
• Associated Cables, four (4)
Additional parts required:
• Faraday Ice Pail (ES-9042A)
• Proof Plane
• Basic Variable Capacitor (ES-9079)
• Pasco Computer Interface (Model 750, 500 or
300)
© 1999 PASCO scientific
012-07124B
9/99
$1.00

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Summary of Contents for PASCO ES-9078

  • Page 1 Model ES-9078 BASIC ELECTROMETER Introduction When replacing batteries, do not touch any The Model ES-9078 is a voltmeter used for direct of the components or wires in the integrated measurements of voltage and indirect measurements circuit panel; the components and of current and charge.
  • Page 2 Basic Electrometer 012-07124B Operation 2. Connect the test lead to the input connector of the electrometer. The controls on the front panel of the electrometer are explained in Figure 1. 3. Connect the ground post of the electrometer to Whether you’re using the electrometer to an earth ground.
  • Page 3 Faraday ice pail, such as those included with measurement, values for the charge can be PASCO’s Demonstration Electrostatics System, and computed according to the relationship Q = CV shown in Figure 2. The proof plane is simply a...
  • Page 4 C V – V disregard . The capacitors in the PASCO RC Network (ES-9053), for example, are high enough that need not be considered. This is not true,...
  • Page 5 Help. It is important to remember that the signal output on the ES-9078 has a fixed scale of ±100 volts. Changing The exclamation point within an equilateral the range switch on the electrometer has no effect on triangle is intended to alert the user of this scaling.
  • Page 6 PASCO scientific. PASCO will repair or replace, at its option, any part of the product which is deemed to be defective in material Address: PASCO scientific or workmanship.

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