User Manual

Command Descriptions

Returns

The query retur

ns the following:

Volts for volts

U for unknown units (divisions)

dB for decibels

? for unknown mask waveforms units

For the TDS1000B, TDS2000B, TDS2000C, and TPS2000 Series, the query can

return the following additional values:

A for amperes

VA for volt×amperes

AA for amperes×amperes

VV for volts×volts

WFMPre:<wfm>:YUNit

Same as WFMPre:YUNit, except that <wfm> speciﬁes the source/destination

waveform instead of DATa:SOUrce and DATa:DESTINATION.

For set commands, if <wfm> is not a reference waveform, the oscilloscope

generates er

ror 2241.

WFMPre:YZEro

For all model and ﬁrmware combinations except the TDS210 or TDS220

oscilloscope (ﬁrmware below V 2.00) with a TDS2CMA communications

module, YZEro is a value, expressed in YUNits, used to convert waveform record

values to YUNit values using the following formula (where dl is digitizer levels):

value_in_YUNits = ((curve_in_dl - YOFF_in_dl) * YMUlt) + YZERO_in_YUNits

YZEroisusedwhencalculatingcursorreadouts.

The set form of this command affects the reference waveform speciﬁed by

DATA:DESTination.

The query form of this command returns a value for the waveform speciﬁed by

DATA:SOUrce. If that waveform is not active or displayed, the query fails and

the oscilloscope generates an execution error with event code 2244 (waveform

requested is not active).

NOTE. For the TDS210 or TDS220 oscilloscope (ﬁrmware below V 2.00) with a

TDS2CMA communications module, the set form is ignored. The query always

returns zero.

2-194 TDS200, TDS1000/2000, TDS1000B/2000B, TDS2000C, TPS2000 Programmer