Measurement Computing PML 1000 Operating Instructions Manual page 10

PML 1000 Operating Instructions
Display Filtering [Filt]
This parameter is used to set up filtering of displayed values. The time constant of the filter entered in seconds.
The default value is zero (no display filtering).
Least Significant Digit Zero [LSd0]
When this parameter is set to ON the right hand digit only displays zero during normal running. The default is
OFF.
Brilliance [briL]
Allows the brightness of the display to be adjusted to match other PML 1000s or to suit ambient lighting
conditions. The brightness may be set in the range 1 to 4. The default setting is 4 which is the highest intensity
setting.
Test [tESt]
Performs a display test which illuminates all display digits and segments (8.8.8.8.8.) when the enter button is
pressed.
CONFIGURING THE INPUT FOR YOUR LVDT
Introduction [inPt]
Before any calibration or scaling operations are performed some operating parameters related to the use of the
particular LVDT need to be set. These parameters are all set up from the input menu.
Setting Input Gain
There are two methods of determining the gain used by the PML 1000 for measurements and calibration. Firstly
the gain can be determined automatically at the time of calibration by the PML 1000. Set the auto option from
the input menu to ON. Alternatively, the sensitivity and stroke of your LVDT can be entered from the menu. This
data will normally be supplied with your LVDT. The sensitivity of the LVDT is normally quoted in mV/V/mm and
is entered in this form. The stroke is set in mm and is the -measurement range of the LVDT.
Automatic Gain Selection [AUto]
Allows the PML 1000 to set its gain automatically by determining the sensitivity of the attached LVDT during
calibration. A more detailed explanation of how this works can be found in Appendix A on Calibration. The
options are Automatic Gain Selection Enabled (On), the default state, or disabled (OFF).
Sensitivity [SEn]
This value is entered to allow the gain of the measurement input of the PML 1000 to be determined from the
specified sensitivity of the LVDT. Details of the sensitivity of your LVDT should be in the documentation supplied
by the manufacturer. The sensitivity is entered directly as a value in mV/V/mm The default sensitivity is 10.0
(mVlVlmm). This menu option is not accessible when Automatic Gain selection is enabled (On).
Stroke [Stro]
This allows the stroke of the LVDT to be entered as a value directly in mm This is used by the PML 1000 in
conjunction with the LVDT sensitivity to determine the appropriate gain setting. This menu option is not
accessible when Automatic Gain Selection is enabled. The default stroke setting is 100.Omm.
Excitation Voltage [Uout]
Select the correct output voltage for excitation for the LVDT. The nominal voltage will be specified in the LVDT
documentation. There are two options 3V AC and IV AC (rms.), the default setting is 3V.
Excitation Frequency [H2]
Set the excitation frequency closest to that specified in the LVDT documentation. The options are 2.5 kHz or 10
kHz. The default is 2.5 kHz.
APP-01025, Rev A
PML 1000 Operating Instructions www.meas-spec.com 1109
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