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AGILENT 35670A
Supplemental Operator’s Guide
73
• Press the [XDCR UNIT CONVERT] softkey (F4)
• Press the [inch (DISP)] softkey (F7)
• Press the [Scale] hardkey.
• Toggle the [AUTOSCALE ON OFF] softkey (F1) until ON is highlighted.
This accomplishes the equivalent of multiplying “g” by 386.4 to get “inches per
second squared” (ips^2), and dividing by (jω)^2 to integrate twice in the frequency
domain to get displacement.
Math Functions and XDCR UNIT CONVERT
When you have specified a “provided” transducer label using XDCR UNIT SETUP
that is a “motion” engineering unit such as:
g
inch/s^2
inch/s
inch
mil
m/s^2
m/s
m
then do not try to convert acceleration to displacement using Analysis: Math
Function and divide by (jω). Instead use the above example to convert directly using
XDCR UNIT CONVERT in Trace Coord, Y UNITS. If this is attempted with Math
Functions, the analyzer will sense that a power spectrum of a known unit “label” is
being integrated or differentiated and will do it using trace coordinates anyway. It is
easier to use the provided capability in XDCR UNIT CONVERT.
Converting Frequency Response Units to Compliance
Unlike power spectrum measurements, frequency response measurements cannot be
automatically converted into other units. Howvere, it is often desired to express a
frequency response result as the ratio of displacement to force, which are units of
compliance, instead of acceleration to force, which are units of 1/mass. To convert a
frequency response measured as “g/lb.” into terms of “inch/lb.”, then proceed as
follows:
Converting “g” to “inch/s^2” requires multiplication by 386.4. This must be entered
as a constant. Converting “inch/s^2” to “inch” requires double integration in the
frequency domain by dividing by (jω) two times. These steps may be entered as
follows
• Press the [Analys] hardkey.