N4L PPA55 Series User Manual

PPA55xx Quick User Guide
Page 12
Smoothing Response
Auto Reset
The smoothing response is by default set to “auto
reset” where the filtering described in “smoothing” is
reset in response to a significant change in data such
as frequency, voltage and current levels. This speeds
up the response of the instrument to changing
conditions
Fixed Time
Auto reset can be disabled so that the filtering has a
fixed time constant, which would have an exponential
response to a step change, this is useful for PWM
inverter drive evaluation where variable frequency
tracking is required
Frequency Reference
The frequency may be measured from any of the
following inputs:
Voltage
Select Voltage to detect frequency from the input
voltage
Current
Select Current to detect frequency from the input
current
Speed Input
Select speed input to frequency detection to set
frequency via “speed input” BNC
AC line
Select ac line to read frequency from the ac line
input, measured from power inlet to PPA
Frequency Reference
On a multi-phase instrument, any Phase may be
selected for the frequency measurement
Phase 1
Select this option to detect frequency from phase 1
Phase 2
Select this option to detect frequency from phase 2
Phase 3
Select this option to detect frequency from phase 3
Phase Angle Reference
Phase angle measurements must be made with
reference to a specific input
Voltage
Phase 1 voltage is by default set as the input
reference
Current
The phase angle reference can be set to current
which is useful if operating the instrument with only
current inputs, or with low level voltage inputs

N4L PPA55 Series Specifications

General

Brand	N4L
Model	PPA55 Series
Category	Measuring Instruments
Language	English