PASCO ES-9078 Скачать руководство пользователя страница 5

012-07124B

Basic Electrometer

$

Note: 

  This  instruction  sheet  assumes  the

user  is  familiar  with 

ScienceWorkshop® 

or

DataStudio™.    Users  can  gain  familiarity  by
working through the tutorials provided in

ScienceWorkshop

 or DataStudio’s Online

Help.

The exclamation point within an equilateral
triangle is intended to alert the user of
important operating and safety instructions
that will help prevent damage to the
equipment or injury to the user.

If  it  is  not  convenient  to  hook  the  electrometer
across  a  known  resistance  in  the  circuit,  a  precision
resistor  can  be  connected  between  the  input  leads
of  the  electrometer.  The  circuit  can  be  broken,  as
for  connection  to  a  standard  ammeter,  and
connected  in  series  with  the  precision  resistor.
Again,  measure  the  voltage  across  this  resistor  and
calculate  the  current.  (The  problem  with  this
technique  is  that  the  resistance  must  be  high
enough  to  measure  a  voltage  drop,  but  low  enough
so  it  doesn’t  significantly  affect  the  current  through
the  circuit).

Using a Computer with Science Workshop
Interface

The  signal  output  connector  on  the  ES-9078
Electrometer provides an output signal for the Science
Workshop  interface.  This  provides  an  output
signal  for  displaying  data  in  analog  meters,  tables,
graphs  or  oscilloscopes,  making  data  analysis  easy.

It is important to remember that the signal output on
the ES-9078 has a fixed scale of ±100 volts. Changing
the range switch on the electrometer has no effect on
this  scaling.  By  choosing  the  Electrometer  icon  in
DataStudio

™ 

or

  ScienceWorkshop®

,  displays  are

shown  correctly  scaled.

Because of limited resolution on this output, it may be
useful  to  apply  gain  within  the  ScienceWorkshop
interface  to  measure  voltages  of  10  volts  or  less.

Specifications

ES-9078  Basic  Electrometer:

V

oltage  input  ranges:

3,  10,  30,  100  volts  full  scale

Input  resistance:

approximately  10^14  ohms

Input  capacitance:

approximately  27  pF

Accuracy:

Analog Meter:  

 +/

3%

ScienceWorkshop  output: 

+/

1%

Signal  output: Fixed at -100 to + 100 volt range

(Automatically  scaled  in  DataStudio

and 

ScienceWorkshop)

Batteries:

  4  -  “AA”  (Alkaline  recommended)

Battery  life:

approximately  75  hours

Содержание ES-9078

Страница 1: ... charge polarity and measures charges as low as 10 11 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 EQUIPMENT Parts included Basic Electrometer ES 9078 Associated Ca...

Страница 2: ... use the electrometer to measure charge current or voltage 6 Set the range switch to the desired voltage range The range setting refers to the voltage input required to produce a full scale meter deflection e g a setting of 30 means that a full scale meter deflection indicates a voltage of 30 volts Important Points for General Operations 1 Between measurements always press the Zero button to disch...

Страница 3: ...le a charged proof plane the electrometer reading will generally remain relatively unchanged This is because the total capacitance is only negligibly affected by the proof plane This may not always be the case however Any charge measurement with the electrometer is indirect based on the knowledge that the amount of charge on an object is proportional to the potential difference The readings of the...

Страница 4: ...in it is given by Q CV If the known charged capacitor is connected across the leads of the electrometer it is connected in parallel with the internal capacitance of the electrometer CE The total capacitance becomes C CE The known capacitor discharges across the electrometer and a voltage VE is read Since the total charge in the system is still just the charge of the known capacitor we know that CV...

Страница 5: ...ect the current through the circuit Using a Computer with Science Workshop Interface The signal output connector on the ES 9078 Electrometer provides an output signal for the Science Workshop interface This provides an output signal for displaying data in analog meters tables graphs or oscilloscopes making data analysis easy It is important to remember that the signal output on the ES 9078 has a f...

Страница 6: ...truction manual note Part number and revision listed by month and year on the front cover Have the manual at hand to discuss your questions Limited Warranty PASCO scientific warrants the product to be free from defects in materials and workmanship for a period of one year from the date of shipment to the customer PASCO will repair or replace at its option any part of the product which is deemed to...

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