Liquid Controls SP718-V REV. A - Manual (Page 3)

Sponsler, Inc. SP718-V Modulated Carrier Amplifier pg 3 DOC#: MN-718V-A
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 12-16.5VDC or 110VAC
Digital Multimeter (DMM)
Frequency Generator
Frequency Counter
Oscilloscope
Refer to Figure
Test Procedure:
NOTE: All test equipment power cords should be equipped with 2-prong ‘cheater’ plugs.
A) Connect Flowmeter with RF Pick-up Coil to J1-1,2
B) Connect Power Supply Positive (HOT) & Negative (NEU) Leads to J1-6,5
Respectively
C) Connect O’Scope Positive & Negative Leads to J1-1,2 Respectively
D) Connect DMM Positive & Negative Leads to J1-3,4 Respectively, Set Function to
Volts DC
E) Install Jumper @ JU4, Set S1 for desired Output Voltage Level
F) Install Jumper @ JU1-3 for desired Full Scale Frequency Range
G) Turn Power Supply ‘ON’, LED D1 Illuminates & O’Scope displays a 50KHz +/- 5KHz
Carrier Sinewave
H) Observe Carrier Amplitude of 6Vp-p
I) Adjust ‘ZERO’ (R25) for a DMM Indication of .000V
J) Disconnect O’Scope
K) Connect Frequency Generator Positive and Negative Leads to J1-1,2 Respectively;
Set Function to Squarewave Amplitude to 5Vp-p & Frequency to desired Full Scale
Point
L) Adjust ‘SPAN’ (R23) for a DMM Indication of 5.00V or 10.00V
M) Reduce Signal Amplitude of Frequency Generator to Zero, Adjust ‘ZERO’ (R25) for
DMM Indication of .000V if necessary
N) Increase Signal Amplitude of Frequency Generator to 5Vp-p; Adjust ‘SPAN’ (R23) for
DMM Indication of 5.00V or 10.00V if necessary
O) Adjust Frequency of Frequency Generator to 0, 25, 50, 75, & 100% of Full Scale
Frequency of Step K
To check for Linearity at any Frequency Point, incorporate the following formula -
(F/F Max X Full Scale Output) = Volts
Example: Assume Maximum Frequency Point = 2KHz (5 or 10V Point)
Check for Linearity at 750Hz. 10V Full Scale Output
750/2000 = .375
.375 X 10 = 3.75V DMM Should Indicate – 3.75V @ 750Hz