Model 4200A-SCS Parameter Analyzer Reference Manual Section 13: LPT library function reference4200A-901-01 Rev. C / February 2017 13-159pulse_vlowThis command sets the pulse voltage low value.Pulse modesStandardUsageint pulse_lhigh(int instr_id, long chan, double vlow);instr_id The instrument identification code of the pulse card, such as VPU1 or VPU2chan Channel number of the pulse card: 1 or 2vlow Pulse voltage low value in volts (floating point number):• Fast speed: −5 to +5• Slow speed: −20 to +20• Default: 0DetailsPulse voltage low can be set independently for each pulse card channel.For a 50 Ω load:• 5 V range (lower voltages and higher transitions): Pulse high and pulse low can be set from −5 Vto +5 V.• 20 V range (higher voltages and lower transitions): Pulse high and pulse low can be set from−20 V to +20 V.For a 1 MΩ load:• 5 V range (high speed): Pulse high and pulse low can be set from −10 V to +10 V.• 20 V range (high voltage): Pulse high and pulse low can be set from −40 V to +40 V.The pulse_range command determines the pulse voltage range.Set the pulse_range command before setting the voltage levels. When using the pulse_rangecommand, changing the source range after setting voltage levels (in any pulse mode) will result involtage levels that are invalid for the new range setting.As shown below, the pulse voltage low is typically set as the lower pulse voltage value. However,voltage low can be any valid voltage value. That means pulse voltage low can be less than voltagehigh. When started, the pulse transitions from voltage low to voltage high and then back to voltagelow. The voltage remains at voltage low for the remainder of the pulse period.Figure 513: Pulse V Low and Pulse V High
