Manual Fluke 8808A (page 68 of 100) (English)

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8808A

Users Manual

4-8

Sending Numeric Values to the Meter

Numeric values can be sent to the Meter as integers, real numbers, or real numbers with

exponents, as shown in the following examples:

+12345689 Sends the signed integer “12345689”

-1.2345E2 Sends “-1.2345E2” or “-123.45”

Sending Command Strings to the Meter

Observe the following rules when you construct strings to be sent to the Meter over the

computer interface:

• Rule 1: Read meter's output buffer once for each query command.

The Meter’s output buffer is cleared after it has been read. This prevents previously

read data from being read a second time by mistake. If you attempt to read the

Meter’s output buffer twice without an intervening query, the Meter will not respond

to the second read.

• Rule 2: Read query responses before sending another command string.

Output data remains available in the output buffer until the host reads it or until the

next command string is received by the Meter. This means the host must read the

Meter’s output buffer before the next command string is sent to the Meter.

• Rule 3: The meter executes each command completely in the order received before

moving on to the next command.

If an input string contains a trigger, enter the commands in the following order:

1. Commands to configure the Meter (if any)

2. The trigger command

3. Commands to read the result of a triggered measurement (VAL?), or to

reconfigure the instrument (if any)

4. The terminator

Note

If MEAS?, MEAS1? or MEAS2? is used, the command should follow

Configure, Trigger.

How the Meter Processes Output

The following paragraphs describe how the Meter processes output. The Meter outputs an

alphanumeric string in response to a query command from the host. (Query commands

end with “?”.) Output strings for RS-232 applications are terminated with a Carriage

Return and Line Feed (<CR><LF>).

After sending the Meter a command via the RS-232 interface, wait for the Meter to return

a prompt before sending another command. Failure to do so causes a device-dependent

command error, and the second string is discarded.

Numeric output from the Meter is shown in the following examples:

+1.2345E+0(format 1) Measured value of 1.2345

+1.2345E+6(format 1) Measured value of 1.2345M

+12.345E+6 OHM(format 2) Measured value of 12.345Mohms

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Fluke 8808A Manual

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