Speed
The SPEED key sets the integration time, or measurement aperture, of the analog to digital (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).
The SPEED setting affects all measurement functions. After setting speed, display resolution can be
changed using the DIGITS key. For the 2602B, 2604B, 2612B, 2614B, 2634B, or 2636B in
single-channel display mode, if you press the SPEED key for the channel that is not being displayed,
it results in a display message to change to the other channel before setting the speed.
Setting the speed from the front panel
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
Setting the speed using the remote interface
The following table shows the command that controls speed. See the TSP command reference (on
page 9-1) for more information.
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