Liquid Controls SP714 - Manual (Page 3)

Sponsler, Inc. SP714 Pulse Amplifier pg 3 DOC#” MN-714-B
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 6-28 VDC, Frequency Generator, Oscilloscope
Test Procedure:
A) Connect power supply positive & negative leads to J1-3,5; Respectively
B) Connect oscilloscope positive & negative leads to J1-4,5; Respectively
C) Connect frequency generator positive & negative leads to J1-1,2;
Respectively. Set function to sinewave, amplitude to zero
D) Install jumper @ JU1, Set “Sensitivity” adjust (R1) to zero
E) Turn power supply “ON”, observe LED D1 illuminates and oscilloscope
displays a .6V DC level maximum
F) Depress S1, LED D2 flashes and the oscilloscope will display a 4Hz
squarewave with a positive amplitude .6V < power supply positive potential
and the negative amplitude will be .6V > power supply negative potential
G) Release S1, Set “Sensitivity” adjust (R1) fully clockwise. On the frequency
generator set the amplitude to 20mV and the frequency between 1 to 10KHz
H) Oscilloscope will display a squarewave at the same frequency selected in step
G. The squarewave amplitude will be the same as step F.
I) While observing the oscilloscope display, momentarily short pins J1-4 & 5
together. The oscilloscope display will be a slight squarewave with an
amplitude .6 or less. When the short is removed the oscilloscope display will
return to the normal amplitude squarewave.
Field Test:
A) Insure that ALL connections are correct and secure.
B) LED D1 should be illuminated, if not check supply voltage @ J1-3,5. Note that
J1-3 must be positive in respect to J1-5 to function.
C) Install jumper JU1 if not already installed, set “Sensitivity”; R1 Mid range.
D) Depress S1 and observe LED D2 flashes - No go; Remove wire @ J1-1
Retest, No go- replace pulse amplifier.
E) Given proper flow exists, LED D2 should be flashing (High flow rate will make
D2 appear to be illuminated steadily) If D2 is “OFF” rotate “Sensitivity” adjust
(R1) clockwise until D2 illuminates. If D2 remains “OFF” check pickup coil
and flowmeter.