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6-174 Chapter 6: Programming
Model 801GC, 801GF & 801GX¥Rev. A
VSPP Vertical Sync Pulse Polarity
Classification: Format parameter setting
Command Syntax: VSPP <polarity>
Limits: <polarity>
0 = active-low (negative going pulse)
1 = active-high (positive going pulse)
Query Syntax: VSPP?
Query Response: <mode>
Description: The VSPP command establishes the logic sense of the digital
vertical sync outputs. Setting polarity to one (1) causes the leading
edge of vertical sync to be a low-to-high transition. Setting
polarity to zero (0) causes the leading edge of vertical sync to
be a high-to-low transition. The VSPP? query returns the current
polarity of VSPP.
Other Required Cmds: In order to use digital vertical sync, it must be gated on with
the VSPG command and digital separate H&V sync must be
selected with the SSST command. The FMTU command instructs
the generator to use the new setting. The ALLU command updates
hardware to the new setting and redraws the test image.
Example: VSPP 1 // Set active hi V sync in
// buffer
VSPG 1 // Enable V sync output in
// buffer
SSST 1 // Select H&V sync type in
// buffer
FMTU // Update hardware to current
// buffer contents
VSPW Vertical Sync Pulse Width
Classification: Format parameter setting
Command Syntax: VSPW <lines>
Limits: <lines>
Query Syntax: VSPW?
Query Response: <lines>
Description: The VSPW command establishes the width of the vertical sync
pulse in lines. If the type specified for the selected sync signal
(see SSST, ASCT, DSCT, or DSST commands) is one of the CCIR
types, then the actual sync pulse width output by the generator
will be 1/2 line shorter than the whole number specified. The
VSPW? query returns the current setting of VSPW.
Other Required Cmds: The FMTU command instructs the generator to use the new
setting. The ALLU command updates hardware to the new setting
and redraws the test image.
Example: VSPW 3 // Set V sync width to 3 lines
// in buffer
FMTU // Update hardware to current
// buffer contents