User Manual

WPS500X User’s Guide Pico Technology
8 DO157-9
6. Operating modes
Ranges 1 to 3
Select the range using the Range button shown in Section 5: “Front-panel controls”.
Range 1: The first range measures from –15 psi (–1 bar) to +500 psi (34.5 bar). It
offers high resolution and accuracy for high-pressure tests such as cranking and
running cylinder compression or fuel pressure testing. It is also helpful for
identifying cam timing issues such as jumped timing belts and stretch timing chains,
especially on multi-cam engines that may not have a cam sensor on each camshaft.
The WPS500X kit includes a specially designed compression hose for performing
this test with a significantly reduced error and higher operating temperature range
than conventional compression hoses and adapters.
Range 2: The second range measures from –15 psi (–1 bar) to +50 psi (+3.45
bar). This range is ideal for vacuum test and fuel system tests. When testing these
systems the zoom function is especially useful to analyze valve operation with the
vacuum waveform or the injectors through the fuel waveform.
Range 3: The third range measures –5 to +5 psi (–0.345 to +0.345 bar). This
setting is sensitive enough to analyze small pressures or pulses such as exhaust
pulses from the tail pipe.
Zoom modes 1 to 3
The zoom feature is used to show small signal details within a larger signal such as
pulses from intake vacuum or amplifying pressure pulses from the exhaust. It
operates by removing all of the voltage from the signal within the selected range
below 100 Hz and then magnifying the remaining signal.
Select the zoom using the zoom button shown in Section 5: “Front-panel controls”.
Pressing the zoom button additional times will step the level of amplification
through the three zoom modes. Press one of the range buttons to turn off the
zoom.