Digital Multimeter with PC Interface
(220-0168)                   Advanced Functions        Faxback Doc. # 3995


USING THE AUTO-HOLD FEATURE

When you first turn on the meter, A-H appears in the upper left corner of
the display to indicate that the auto-hold feature is turned on.  When
this feature is turned on, the secondary display shows the reading taken 4
seconds earlier.  To turn off this feature, press FUNCTION to select one
of the other advanced functions.

USING THE DATA HOLD FEATURE

The data hold feature lets you hold a reading on the display.

To turn on the data hold feature, press FUNCTION until D-H appears at the
top of the display.  Both the main and secondary displays show the current
reading.  To hold a reading on the secondary display, press SET/RESET.
The main display continues to track the current measurement.  Press 
SET/RESET to release the measurement and return to the auto-hold function.
Or, press FUNCTION to select another advanced feature.

USING THE MINIMUM FEATURE

The minimum feature lets you measure the minimum value of a changing
reading.  To turn on the minimum reading feature, repeatedly press
FUNCTION until MIN appears at the top of the display.

Both the main and secondary displays show the current reading.  Press
SET/RESET to activate the minimum feature.  The secondary display only
updates when the current reading is lower than the previously held
reading.  The main display continues to track the current measurement.
Press SET/RESET to release the measurement and return to the auto-hold
function.  Or, press FUNCTION to select another advanced feature.

USING THE MAXIMUM FEATURE

The maximum feature lets you measure the maximum value of a changing
reading.  To turn on the maximum reading feature, repeatedly press
FUNCTION until MAX appears at the top of the display.  Both the main and
secondary displays show the current reading.  Press SET/RESET to activate
the maximum feature.  The secondary display only updates when the current
reading is higher than the previously held reading.  The main display
continues to track the current measurement.  Press SET/RESET to release
the measurement and return to the auto-hold function.  Or, press FUNCTION
to select another advanced feature.

USING THE RELATIVE MEASUREMENT FEATURE

The relative measurement feature lets you measure values relative to a
reference value that you set.  For example, you can set a reference
voltage and then measure the difference between the actual voltage and the
reference voltage.  Follow these steps to set a reference value.

1.  Repeatedly press FUNCTION until REL appears at the top of the display.

2.  Press UP or DOWN To set the reference value's polarity.  (- appears
    for negative values.)  Press SET/RESET.

3.  Press UP or DOWN to set the reference value's first digit.  Press
    SET/RESET.

    Note:  The first digit can be either 1 or nothing.  0 does not appear
           on the display for the first digit.

           Repeat Step 3 for the other three digits.  After you enter the
           last digit, the meter begins making relative measurements.  The
           main display shows the actual measurement.  The secondary
           display shows the difference between the measured value and the
           reference value.

STORING MEASUREMENTS IN MEMORY

Follow these steps to store up to ten measured values in memory for later
recall.

1.  Select the measurement type and range with the rotary selector.

2.  Repeatedly press FUNCTION until MEM appears at the top of the display.

3.  Repeatedly press UP or DOWN until the secondary display shows the
    number of the memory you want to store a value in.

4.  While making a measurement, press SET/RESET to store the current
    measurement.

RECALLING STORED MEASUREMENTS

Follow these steps to recall a measured value from one of the ten
memories.

1.  Repeatedly press FUNCTION until RCL appears at the top of the display.

2.  Repeatedly press UP or DOWN until the memory you want to recall
    appears in the secondary display.

3.  Press SET/RESET. The stored value appears in the secondary display.

USING THE DUAL MEASUREMENT FEATURE

Your meter can measure and display two different types of measurements at
the same time.  To set the dual mode, repeatedly press FUNCTION until
DUAL appears at the top of the display.

The meter displays the following dual measurements:

Input Range Selection            Main Display            Secondary Display

AC VOLTAGE                       AC Voltage              Frequency

Frequency                        Frequency               AC Voltage

Notes :  The meter indicates a frequency measurement on the secondary
         display when you select the DC/AC A, resistance, diode, or hFE
         modes and turn on the dual function.  This measurement is not
         valid.

         When you select dual measurement while measuring frequency, the
         meter selects the 20V AC range for the secondary display.  To
         measure both the voltage and frequency, when the voltage is
         greater than 20V AC, select AC voltage as the primary
         measurement.

USING THE METER WITH A COMPUTER

INTERFACING THE METER WITH A COMPUTER

Follow these steps to connect the meter to a computer.

1.  Connect the supplied RS-232C cable between the meter's and the
    computer's serial port.

2.  Press POWER to turn on the meter.

3.  Turn on the computer.

USING THE SUPPLIED SOFTWARE

We have included two programs to log and display data collected with your
meter.  The MS-DOS program is called RS, and is in the GRAPHIC
subdirectory on the supplied diskette.  The Windows program is called
Scopeview, and is in the GRAPHIC subdirectory on the supplied diskette.

Note:  You can not log frequencies on the computer if the voltage exceeds
       20V AC.

Using the DOS Software

Follow these steps to install and run the MS-DOS software.

Note:  The following steps assume a basic knowledge of MS-DOS commands,
       and also assume you have a hard disk. Refer to your computer's
       MS-DOS User's Guide for information about MS-DOS commands.  This
       software requires a VGA monitor.

1.  Insert the supplied diskette in your computer's 3 1/2-inch drive.

2.  Create a directory on your hard disk for the software.  For example,
    to make a directory called METER for the software, type:

    cd\<ENTER>

    md METER <ENTER>

3.  Make the directory you created the current directory.  For example, if
    the directory is METER, type:

    cd\METER <ENTER>

4.  Copy the files from the GRAPHIC subdirectory on the floppy drive to
    your hard disk.  For example, type:

    copy a:\GRAPHIC c:

5.  To run the program, type RS <ENTER>.  Follow the on-screen help for
    specific operating instructions.

Notes:  If you do not have a hard disk, you can still run the program from
        the supplied floppy diskette.  Change to the GRAPHIC subdirectory
        on the diskette, and type RS <ENTER>.

        To stop the program or to escape from a device I/O error, press
        <CTRL + BREAK>.

        To get the DOS software to save data, when you begin the program,
        go to the file option on the top of the screen (with either the
        mouse or by pressing the F10 key and using the arrows) and select
        NEW prior to taking measurements.  Later to retrieve it, go to
        OPEN in the same pull down menu.

Using the Windows Software

Follow these steps to install and run the Windows software.

Note:  The following steps assume a basic knowledge of Microsoft Windows.
       Refer to your computer's Windows User's Guide for information about
       using Windows.  This software requires Microsoft Windows, Version
       3.1 or later and a VGA or EGA display.

1.  Start your computer and run Windows.

2.  Insert the supplied diskette in your computer's 3 1/2-inch drive.

3.  From the Windows Program Manager, pull down the FILE menu and select
    the RUN option.

4.  At the prompt, type:

    a: \scope\setup <ENTER> (If you placed the diskette in Drive A)

    b: \scope\setup <ENTER> (If you placed the diskette in Drive B)

5.  Follow the on-screen prompts to complete the installation.

6.  To run the program double-click the SCOPE-VIEW icon.  Follow the
    on-screen help for specific operating instructions.

    Also, refer to the README file in the diskette's SCOPE subdirectory
    for operation hints.

TECHNICAL INFORMATION

You need the following information if you are writing your own interface
software.

Communication parameters

    Transmission rate:   1200 Baud

    Character coding :  7-bit ASCII

    Parity           :  None
 
    Stop Bits        :  2

Data Format

The data format consists of a frame of 14 bytes.  The frames are set as 
follows:

BYTE)            1 2 3 4 5 6 7 8 9 A B C D E

Example 1)       D C   - 1 . 9 9 9 V       CR

Example 2)               1 . 9 9 9 M o h m CR

REPLACING THE FUSE

WARNING:  TO AVOID ELECTRIC SHOCK, DISCONNECT THE TEST PROBES BEFORE
          REMOVING THE BATTERY OR THE FUSE.  REPLACE ONLY WITH THE SAME
          TYPE OF BATTERY OR FUSE.  SERVICE SHOULD BE PERFORMED ONLY BY
          QUALIFIED PERSONNEL.

CAUTION:  For continued protection against fire or other hazard, replace
          only with a fuse of the specified voltage and current ratings.

    F1 - Radio Shack Cat. No. 270-1052

    F2 - Radio Shack Cat. No. 270-1041

Follow these steps to replace the fuse.

1.  Turn off the meter and disconnect the test probes.

2.  Remove the cover by unscrewing the four screws and pulling off the
    meter's cover.

3.  Remove the blown fuse.

4.  Install the new fuse in the fuse compartment.

5.  Replace the cover and secure it with the screws.

WARNING:  DO NOT OPERATE YOUR METER UNTIL THE BACK COVER IS IN PLACE AND
          FULLY CLOSED.

(br/ir-07/11/96)

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