Language Reference

FP

 

TH

Set or query the Fabry-Perot laser threshold amplitude.

 

Item

Description

 

FP

 

TH?

 

Queries the DLP

and returns the preset threshold value

 

 

 

Preset

State

 

090 dB from peak

 

 

 

 

Example

10

OUTPUT

723;"IP;";

Preset the instrument.

 

 

 

 

 

20

OUTPUT

723;"FP_;";

Start the FP

 

 

measurement

DLP.

 

 

 

 

 

30

OUTPUT

723;"FP_TH?;";

Query the instrument

for the current thresh-

 

 

 

 

 

 

 

old amplitude

setting

of the Fabry-Perot laser.

 

 

40

OUTPUT

723;"FP_TH 020 DB;";

Set the threshold amplitude

for measured peaks

 

 

 

 

 

 

 

to 020 dB.

 

 

 

 

Description

Query Response

See Also

The FP TH command allows measurements using only the peaks above the threshold. (All signals above the threshold are used in the calculations.) The threshold is relative to the peak mode. If FP TH is set to 020 dB, only those peaks greater than 20 dBc are used in the power calculations. Refer to the HP 71450B/1B/2B User's Guide for additional information.

FP

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