Measurement-computing Analyzer488 Manuale Utente Scaricare il pdf (Pagina 140)

Section 4 Serial Controller

4.46

MEASURE

The

MEASURE

command is used to return the speed of previous bus events.

Responses may be returned in either a string format or a machine readable format.

If the command MEASURE

MEASURE0

is issued, a string in the

following format will be returned:

Time n.nnn m Seconds Count nnnnn

Bytes Rate n.nnn Bytes/Sec.

If the command

MEASURE1

is issued a machine readable string in the following

format will be returned:

nnnnnnnn mmmm,

where

nnnnnnnn

is the time in

microseconds and

mmmm

is the number of bytes transferred during that time.

Triggering, using the

SET TRIGGER

command, must be used to obtain correct

results when using the

MEASURE

command. Recording must also be on (by issuing

the

RECORD ON

command). Measuring starts when the trigger point has been found

and is stopped when the record sequence has completed. Refer to the

SET TRIGGER

command for further information on specifying trigger conditions.

In order to ensure accurate readings,

HANDSHAKE

must be set to

NONE

FAST

during the bus events being measured.

This command does not have a query option.

TYPE Record command

SYNTAX

MEASURE [number]

number is

. If not specified,

is assumed.

RESPONSE

Time n.nnn m Seconds Count nnnnn Bytes Rate

n.nnn Bytes/Sec.

(

MEASURE0

)

nnnnnnnn mmmm

(

MEASURE1

)

REMARKS To measure the response time of a particular instrument, (the time

between the device being addressed to

TALK

and when it sends out

the first byte), set the trigger conditions as follows:

MATCH

= the

talk address of the instrument,

TRIG DELAY

= 0,

POST COUNT

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 280 281

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