B&K Precision 4034 - Manual - Manual (Page 31)

31
routine finds an error, an error message is displayed. The waveform generator also displays error messages when
front-panel settings are either invalid or may produce unexpected results.
Error messages
Message Text Cause
Setting conflict Can't have this parameter set with other parameters.
Trig rate short Internal trigger rate too short for pulse or burst.
Empty location Attempt to restore a non existent setting.
Calibration Error An error when performing unit calibration – for service personnel only.
LCA load error Internal hardware error, must re-power the unit
Output overload An excessive loading of the output stage
Verify unit calibration At power-on the unit checks for valid calibration data. Need to calibrate the unit.
Incorrect entry A incorrect value entry or syntax error
Width too high The width value is too high for the pulse period selected
Set other level When the pulse amplitude is >10Vp-p, need to change the other pulse level
Save to Flash failed When saving the instrument settings. Need to save again the setting.
Out of range Attempt to set a value out of instrument limits or in conflict with other pulse
parameters.
3.13 Pulse Definitions
The figures illustrate the various pulse parameter definitions.
Pulse HIGH LEVEL corresponds to the most positive level of the pulse. Pulse LOW LEVEL corresponds to the
most negative level of the pulse. Pulse AMPLITUDE is defined as the difference between the HIGH LEVEL and
LOW LEVEL values.
Transition time (LEADING or TRAILING EDGE) is the interval required for the pulse to go from 10% to 90% of
the selected amplitude or vice versa.
The way in which the instrument defines pulse parameters makes a distinction between the selected pulse, which
assumes the fastest transition times and the actual pulse output. The values specified for WIDTH, PERIOD, and
DELAY are defined with reference to the point at which the selected pulse reaches 50% of the amplitude during the
leading and trailing edges at the fastest transition time.
WIDTH is the time interval between the 50% points of the leading and trailing edges. If the selected leading and
trailing edge transition times are equal, the time interval between the 50% points is the same as that between the first
and third corners.
PERIOD is the time between the 50% points on the rising edges of two consecutive trigger outputs. DELAY is the
time between the 50% points on the rising edge of the TRIG OUTPUT pulse and the 50% point of the leading edge
of the output pulse (at fastest transition time).
When VARIABLE TRANSITION TIMES are selected, the time interval between the 50% points of the actual
pulse depends on both the WIDTH and TRANSITION TIME settings. A trailing edge slower or faster than the
leading edge respectively lengthens or shortens the 50% interval. In effect, the pulse edges pivot about the first and
third corners while the interval between these corners remains fixed for a given width setting.
As long as the leading and trailing edge times are equal, the selected width and the actual width are the same.