Ametek PST-2000 Manuale - Pagina 8

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8 900 Series Speedometer
Connect the PST-2000 as described in Figure 2.
1.
Turn the PST-2000 Input Voltage switch to either 12 volts or 24 volts, whatever is
2.
appropriate for your vehicle.
Turn the ignition on.
3.
a.
If the green Battery Voltage LED is on, continue this procedure.
b. If one of the red LEDs is on, the Input Voltage switch may not be set to
the vehicle's battery voltage, or the battery voltage is too high or too low.
c.
If no LED is on, the PST-2000 fuse may be blown, the PST-2000 or its in-
put cable may be defective, or you may have a bad power connection.
Recheck your connections.
Note - If using an AC/DC adapter input cable, the High LED may light when
no gauge is connected to the tester. Disregard this indication.
Set the Signal switch down (square wave).
4.
Note which switches on the back of the speedometer are closed (on), then verify
5.
they are completely closed by using a sharp, pointed object such as a scribe.
Write down which switches are closed (on) and locate this switch combination in
6.
the "Switches Closed" column of Accuracy Table 072-40319.
Check the speedometer's accuracy at 50 mph as follows:
7.
a.
Read across the row that contains your speedometer's switch combina-
tion to the column headed "Hertz @ 50 MPH" to obtain the 50 mph input
frequency value.
b. Set the Signal Range knob to the correct range based on the 50 mph fre-
quency value you just found. (For most speedometers, this will be 187 to
2k.) This simulates the frequency input from the vehicle's speed sensor.
c.
Adjust the Signal Adjust knob until the speedometer pointer indicates 50
mph.
d. After a 5-second stabilization time, the displayed value should be within
the values given in the column headed "Range, 50 MPH" for your switch
setting.
Check the accuracy at 25 mph as previously described, but use the values in the
8.
"Hertz @ 25 MPH" and "Range, 25 MPH" columns, and adjust the Signal Adjust
knob to position the pointer at 25.
Check the accuracy at 80 (or 85) mph as previously described, but use the values
9.
in the "Hertz @ 80 MPH" and "Range, 80 MPH" columns (or "Hertz @ 85 MPH"
and "Range, 85 MPH" columns), and adjust the Signal Adjust knob to position
the pointer at 80 (or 85).
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