Agilent Technologies 4294A, Programming Manual

Page: 456 / 518

456 Chapter 16
GPIB Command Reference
TOPV
TOPV
Syntax TOPV <numeric>[OHM|DEG|RAD|SIE|H|F|PCT]
TOPV?
Description Sets the maximum value of the display screen in the Y axis (vertical axis) direction (value
of the top of the grid).
If the difference, between this maximum value and the minimum value in the Y-axis
direction on the display screen (set with the “BOTV” command on page 273), is less than
10E-15 (for the log Y axis format, the ratio between the maximum value and the minimum
value is less than 5), the minimum value is automatically changed so that it is less than the
maximum value minus 10E-15 (for the log Y axis format, the value at which the ratio
between the maximum value and the minimum value is 5). Also, the single grid tick width
(SCALE/DIV) and the reference line value (REFERENCE VALUE) are automatically
changed so that they match the setting of the minimum value/maximum value in the Y-axis
direction.
In the log Y axis format, if the sign differs from that of the display screen minimum value,
the sign of the minimum value is automatically changed to the same sign as the maximum
value.
Parameters
If the specified parameter is out of the allowable setting range, the minimum value (if the
lower limit of the range is not reached) or the maximum value (if the upper limit of the
range is exceeded) is set.
Query response {numeric}<newline><^END>
Corresponding
key
[Scale Ref]
-
TOP VALUE
<numeric>
Description Maximum value of the display screen in the Y axis (vertical axis)
direction
Range Varies depending on the measurement parameter as follows:
For |Z|, R, X: -1E12 to 1E12
For other than |Z|, R, X: -1E9 to 1E9
Initial value Varies depending on the measurement parameter as follows:
For |Z|, R, X, Rs, Rp: 1E6
For
θ
: 180
For |Y|, G, B, D: 1
For Cs, Cp: 1E-3
For Ls, Lp: 10
For Q: 1E3
Unit Varies depending on the measurement parameter (refer to the
explanation of unit in “SCAL” on page 423).
Resolution
1E-15
*1
*1.This is the minimum value (when the set value is small). The resolu-
tion becomes larger as the set value becomes larger.