Section 4: Sourcing and measuring Model 2601B-PULSE System SourceMeter Instrument Reference Manual
4-60 2601B-PULSE-901-01A April 2020
Speed when the pulser is disabled
The SPEED key sets the integration time, or measurement aperture, of the A/D converter (period the
input signal is measured). The integration time affects the usable digits, the amount of reading noise,
and the reading rate of the instrument. The integration time is specified in parameters based on the
number of power line cycles (NPLC), where 1 PLC for 60 Hz is 16.67 ms (1/60) and 1 PLC for 50 Hz
is 20 ms (1/50).
In general, the fastest integration time (0.001 PLC) results in the fastest reading rate, but also causes
increased reading noise and fewer usable digits. The slowest integration time (25 PLC) provides the
best common-mode and normal-mode noise rejection, but has the slowest reading rate. Settings
between the fastest and slowest integration times are a compromise between speed and noise. The
default power-on speed setting is NORMAL (1 PLC).
Setting speed
Speed is set from the SPEED configuration menu and is structured as follows.
Front-panel speed configuration
Press the SPEED key (or use the CONFIG menu) to display the following menu items:
• FAST: Sets the measurement speed to 0.01 PLC (fast performance, but accuracy is reduced)
• MED: Sets the measurement speed to 0.10 PLC (speed and accuracy are balanced)
• NORMAL: Sets the measurement speed to 1.00 PLC (speed and accuracy are balanced)
• HI-ACCURACY: Sets the measurement speed to 10.00 PLC (high accuracy, but speed is
reduced)
• OTHER: Sets the measurement speed to any PLC value from 0.001 to 25
The SPEED setting affects all measurement functions. After setting speed, display resolution can be
changed using the DIGITS key.
Remote speed programming
Speed command
The following table shows the command that controls speed. See the TSP command reference (on
page 11-1) for more information.
nplcsmua.measure.nplc = nplc
Sets the speed of the ADC (nplc = 0.001 to 25).
* The speed setting is global and affects all measurement functions.
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