Liquid Controls SP717 - Manual (Page 3)

Sponsler, Inc. SP717 Modulated Carrier Amplifier pg 3 DOC#” MN-717-A
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 6-28 VDC, Frequency Generator, Frequency Counter,
Oscilloscope
Test Procedure:
A) Connect RF pickup coil to J1-1,2
B) Connect power supply positive & negative leads to J1-3,5 respectively
C) Connect oscilloscope positive & negative leads to J1-1,2 respectively
D) Install jumper @ JU1
E) Turn power supply “ON”, observe LED D1 illuminates and oscilloscope
displays a 50khz + 5Khz carrier sinewave
F) Observe carrier amplitude of 6Vp-p nominal
G) Connect oscilloscope positive & negative leads to J1-4,5 respectively
H) Connect frequency generator positive & negative leads to J1-1,2 respectively.
Set function to squarewave, amplitude to 5Vp-p & frequency to 1-3500 Hz.
I) LED D2 illuminates & the oscilloscope displays a squarewave whose
frequency is that of step H with a positive amplitude .6V < power supply
positive potential and a negative amplitude .6V > power supply negative
potential.
J) Observing oscilloscope display momentarily short pins J1-4 & 5 together. The
oscilloscope will display a squarewave with an amplitude of .6V or less.
When the short is removed the oscilloscope will display a normal amplitude
squarewave.