Gain control mode, Attenuation – Teledyne LeCroy DA1855A User Manual
Page 53
Operator’s Manual
922258-00 Rev A
47
Gain Control Mode
The DA1855A amplifiers have two modes for setting the amplifier gain and attenuation; Auto and
Manual. (Refer to Gain Control Modes on page 47, Operation, for more information.) The gain
control mode can be selected in the DA1855A control menu through the oscilloscope front panel, or
through remote control by sending the commands which correspond tot the gain mode.
Sending the PRx:ATTEN or PRx:GAIN commands will set the DA1855A amplifier to Manual gain
control mode.
Sending the PRx:VDIV command will set the DA1855A amplifier to Auto gain control mode.
Attenuation
PRx:ATTENUATION,PRx:ATTEN
Command/Query
Description
The PRx:ATTENUATION command sets the attenuation of the differential
amplifier, including the factor of any passive probe attached to the input.
The command will also switch the Atten/ Gain control mode to Manual if it
was to Auto mode. The valid arguments with no probe attached is 1 or 10
when the input resistance is set 1 MΩ, or only 1 when the input resistance is
set to 100 MΩ. The valid arguments must be scaled by the attenuation
factor of any passive probe which is attached to the amplifier.
The PRx:ATTENUATION? query returns the attenuation of the differential
amplifier, including the attached probe connected to the specified channel.
Command Syntax
PR2, PR3, PR4}
to 1 MΩ or {1*} when the input resistance is set to 100 MΩ.
* Attenuation arguments must be scaled by the attenuation of any passive
probe which is attached to the differential amplifier inputs.
Query Syntax
Response Format
Example
The following command sets the attenuation of the differential amplifier
connected to channel 1 to ÷100 when a ÷10 probe is attached:
CMD$=”PR1:ATTN 100”:CALL IBWRT(SCOPE%,CMD$)