TMP-100
12
August 2008
Adjusting the pulse duration requires an oscilloscope, a power supply, and a signal generator.
To adjust the pulse duration, perform the following steps:
1.
Connect the power supply to the
POWER IN
terminals as shown in Figure 2.
2.
Connect the signal generator in place of the turbine meter on the
TM IN
terminals.
3.
Set the amplitude of the generator at 100 mV and 1 KHz.
4.
Set
SW2
POS 3 to the “on” position. All other dip switches should be set at “off.”
This setting will select 1 pulse out approximately every 4 seconds.
5.
Connect the oscilloscope to the
PULSE OUT
terminals with a vertical setting of 1
volt per division.
6.
Set the horizontal sweep setting for 3 or 4 divisions equal to the desired pulse
duration.
7.
Adjust the pulse duration control
R10
for the desired pulse width on the scope.
The pulse duration adjustment affects both pulse-out and relay-on durations.
Important—The TMP-100 may be factory-modified for pulse durations of 500 microseconds
to 60 milliseconds. Pulse duration should be specified at the time of order. Modification fees
may apply.
Input Signal Sensitivity Adjustment
The TMP-100’s sensitivity is factory-set at 20mV.
To change the input sensitivity, perform the following steps:
1.
Connect the test equipment as described in steps 1 through 4 of the pulse duration
adjustment procedure.
2.
Connect the oscilloscope to the
A&S
output terminals.
3.
Set the amplitude of the signal generator to the desired trigger level.
4.
Turn input sensitivity control
R3
counterclockwise until the signal disappears from
the oscilloscope screen.
5.
Slowly turn
R3
clockwise just until the square wave signal appears on the screen.
