10.
Verify the odometer and built-in trip odometer (if applicable) are advancing prop-
erly by adjusting the Signal Adjust knob until the pointer reads 60 mph. The
odometers should then advance one mile every 59 to 61 seconds.
The following example will help you understand the procedure:
Your speedometer’s switches S1, S3, S5, and S8 are on (closed). After looking up that
switch combination in the “Switches Closed” column of Accuracy Table 072-40314
and reading across to the “Hertz @ 50 MPH” column, your find that your frequency
value is “1456”. You would then set the Signal Range knob on the PST-2000 to the
187–2k range and adjust the Signal Adjust knob to position the pointer at 50 mph. If
the speedometer is accurate at 50 mph, the PST-2000 will display between 1409 and
1502 as given in the “Range, 50 MPH” column.
9 900 Series Tachometer
1.
Connect the PST-2000 as described in Figure 2.
2.
Turn the PST-2000 Input Voltage switch to either 12 volts or 24 volts, whatever is
appropriate for your vehicle.
3.
Turn the ignition on.
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.
4.
Set the Signal switch down (square wave).
5.
Note which switches on the back of the tachometer are closed (on), then verify
they are completely closed by using a sharp, pointed object such as a scribe.
6.
Write down which switches are closed (on) and locate this switch combination in
the “Switches Closed” column of Accuracy Table 072-40315.
7.
Check the tachometer’s accuracy at full scale as follows:
a. Read across the row that contains your tachometer’s switch combination
to the column headed “Full Scale Hertz” to obtain the full scale input fre-
quency value.
b. Set the Signal Range knob to the correct range based on the full scale fre-
quency value you just found. (For most tachometers, this will be 880 to
10k.) This simulates the frequency signal from the vehicle’s engine speed
sensor.
Using the PST-2000 with Freightliner Trucks
072-40236-B
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