Liquid Controls SP711-3 - Manual (Page 3)

Sponsler, Inc. SP711-3 3-Wire Analog Transmitter pg 3 DOC#: MN-711-3-A
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 12-28VDC, Digital Multimeter (DMM), Frequency
Generator, & Frequency Counter
Refer to Figure
Test Procedure:
A) Connect DMM positive & negative leads to J1-3,4 respectively & set DMM function
to DC Volts
B) Connect power supply positive & negative leads to J1-5,4 respectively
C) Connect frequency generator positive & negative leads to J1-1,2; respectively.
Set output to sinewave & amplitude to zero
D) Install jumper @ JU2-4 for desired full-scale frequency range, set S1 to 0-5V or
0- 10V for desired output level.
E) Set ‘Sensitivity’ adjust (R1) fully clockwise
F) Turn power supply & frequency Generator ‘ON’, DMM should indicate 0VDC
G) Adjust ‘ZERO’ (R10) for DMM indication of .000V
H) Adjust signal amplitude of frequency generator to 20mV & frequency to maximum
desired point (full scale frequency)
I) Adjust ‘SPAN’ (R8) for 5.00V or 10.00V DMM indication
J) Reduce signal amplitude of frequency generator to zero, adjust ‘ZERO’ (R10) for
DMM indication of .000V if necessary
K) Adjust signal amplitude of frequency generator to 20mV, adjust ‘SPAN’ (R8) for
5.00V or 10.00V DMM indication if necessary
L) Adjust frequency of frequency generator to exactly 50% of maximum frequency
point in step H, DMM should indicate 2.50V or 5.00V + .02V.
To check linearity @ any frequency point, incorporate the following formula:
(F/F
max
X full scale output) = Volts
Ex. Assume maximum frequency point = 2000Hz & full scale output
Voltage = 10V
Check for linearity @ 750Hz point
750/2000 = .375
10 X .375 = 3.75 DMM should indicate 3.75V + .03V