UT5A
22
SETUP
Monostable Mode:
1. Install a Shorting Block across pins 1 & 2 of JMP6.
2. In the Monostable mode the timer needs an input. Install a Shorting
Block across both pins of JMP4.
3. Connect the source circuit to J2. Connect the input to J2 pin 1 if the
signal is a positive going pulse or pin 3 if it is a negative going pulse.
Connect the ground of the source circuit to J2 pin 2. If the input signal is a
square wave or a wide pulse you can select which edge of the waveform
you wish the timer to trigger. If you wish to trigger on the positive going
transition connect to pin 1 if the negative going transition connect to pin 3.
4. Your input circuit may need a pull-up resistor. If the source circuit
provides both a high and low the pull-up will not be needed so remove the
Shorting Block from JMP2. If the input circuit provides a contact closure
or open/closed path for current then you will need the pull-up resistor.
Place a Shorting Block on the pins of JMP2.
5. If the input signal is a square wave or wide duration pulse you will
probably need the signal to be differentiated. This prevent the input signal
from interfering with the timing of the timer. Remove the Shorting Block
from the pins of JMP3 to activate the differentiator circuit. If it is required
that the differentiator be disabled install a Shorting Block across JMP3’s
pins. This Shorting Block will normally not be installed
6. Verify that R4, R5, and C2 are the proper values to give the timing
you require.
Astable Mode:
1. Install a Shorting block across pins 2 & 3 of JMP6.
2. Typically a in the Astable mode an input is not required. Remove the
Shorting Block from JMP4. This removes R3 and R1 from C2’s charge
path with JMP6 jumped pins 2 to 3.
3. Verify that R4, R5, R6, R7 and C2 are the proper values to give the
timing you require for both Pulse Width and Rest Time.
Control Voltage Configuration:
1. For no Control Voltage remove the Shorting Block from JMP5 and
leave J3 pin 1 open.
