Keithley 2701FPanelSpeed free download

File name 2701FPanelSpeed.pdf

Model 2701 Fast Data Rates Using Front Panel Controls Introduction The Model 2701 maximum data rate is specified at 3500 readings per second1. To achieve this rate there are several parameters that must be configured. Not all of the parameters are available through front panel controls. This technical note describes a technique to configure the 2701 for maximum speed with a remote connection and how to save this set up in order to achieve the maximum data rate using the front panel controls at a later time without the remote connection. Setting Parameters Four parameters can be controlled from the front panel to configure the Model 2701 for high speed. With this configuration the data rate achieved is about 220 readings per second. These parameters and their settings are as follows: 1. Rate = Fast 2. Range = fixed 3. Filter = Off 4. Delay = Off But this is not the maximum rate the data can be obtained with the Model 2701. The following additional parameters need to be configured in order to obtain the maximum data rate. 1. Rate = 0.002 NPLC (Fast from front panel is 0.1 NPLC) 2. AutoZero = Off 3. Trigger Count set to 1 4. Sample Count set to 1000 or higher These parameters are only controlled through software control over a remote connection (Ethernet or RS-232). Once these parameters are set, the entire configuration could be saved in memory. Then this configuration is recalled from memory using front panel controls. The fast 3500 readings/sec rate is now achievable from front panel controls. The memory is nonvolatile so the parameters remain intact when power is off. Once the configuration is set it will not change unless overwritten with new settings. Up to four different configurations can be saved in memory. The following is a sample of SCPI command codes to configure the Model 2701 for maximum data rate. *RST Reset Model 2701 :SENSE:VOLT:DC:NPLC 0.002 Set 0.002 Line Cycle Integration :SENSE:VOLT:DC:RANGE 10 Fix range to 10V :SENSE:VOLT:DC:AVERAGE:STATE OFF Disable Filter :TRIGGER:DELAY 0 Trigger delay set to 0.0 :SYSTEM:AZERO:STATE OFF Disable AutoZero function :TRIGGER:COUNT 1 Trigger count = 1 :SAMPLE:COUNT 1000 Take 1000 readings for every one trigger *SAV 1 Save configuration in memory 1 1 This is the speed of the 2701 mainframe without any switching. These commands set the Model 2701 configuration for maximum speed. This is only achieved when the memory location is invoked. Once the configuration is downloaded it must be recalled on the front panel in or