M405 datasheet(71/89 Pages) BK

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25.5 Explanation of Command

* “CR(0D[HEX])+LF(0A[HEX])” is added to the end of every command. When the command is sent from PC,

2650A/2652A/2651 and 2658A return some responses, which include “OK” + CR + LF, “ERR” + CR + LF, or

“(response to command)” + CR + LF.

* By inputting “?” instead of “* *” for each command, the current setting parameters will be queried and a

response of the value will be received by the PC.

(Except for “ ---- Request” command and the command for inputting corrected data.)

Setting center frequency

Command : FREQ* * * * * * *

(* * * * * * *: Refer to “25.6 Input of frequency”)

Example: FREQ1.235G

Query: FREQ?

Request set marker

Command : FREQSETMK

* The center frequency is set according to the frequency of current marker position.

Setting frequency span

Command : SPAN* * * *

2650A, 2652A, 2651:

(* * * * = ZERO, 200K, 500K, 1M, 2M, 5M, 10M, 20M, 50M, 100M, 200M, 500M,

1G, 2G, FULL [unit : Hz])

2658A:

(* * * * = ZERO, 200K, 500K, 1M, 2M, 5M, 10M, 20M, 50M, 100M, 200M, 500M,

1G, 2G, 5G, FULL[unit : Hz])

Example: SPAN500K

Query: SPAN?

Setting reference level

Command : REF* * *

(* * * = -60 to 10 [1 step, unit : dBm] )

Example: REF 5

Query: REF?

Setting reference level unit

Command : UNIT * * * *

(* * * * = DBM, DBUV, DBMV, DBV)

Example: UNITDBUV

Command

Unit

DBM

dBm

DBUV

dBμV

DBMV

dBmV

DBV

dBV

* When the unit is other than dBm, convert

into dBm by using calculation formula in

“9.8 Relation between reference level and

ATT/AMP”.

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