AMETEK SFA Series - Manual (Page 55)

Sorensen SFA Series Verification and Calibration
10. Verify the unit is set to 10% ± 0.8% of full-scale output current. If
necessary, adjust R55 for 10% of full-scale current on the shunt.
11. Repeat the steps above as required to obtain the required accuracy.
12. Set the programming source to obtain 100% output current on the
shunt. Verify that the front panel meter displays 100% ± 1% of full-scale
output current. If necessary adjust R85 such that the current display
reads 100% current.
CAUTION!
Hazardous voltages may be present on the output after the output is disabled due
to stored capacitive charge. Allow 5 minutes to drain the output capacitive charge
to safe levels before connecting or removing output wiring.
4.2.2 R
ESISTOR
P
ROGRAMMING
C
URRENT
S
OURCES
1. Disable AC power to the unit. Turn the front panel Current knob fully
counterclockwise.
2. Connect the power supply to a precision current shunt (see Figure 4-1,
Section 4.1.2 Preparation).
3. Set the SFA Series unit to operate in remote current programming
mode using resistance by connecting a 5K ohm (1% or better
tolerance) resistor as shown in Figure 3–5 in Section 3.3 Remote
Current Programming.
4. Attach a precision meter across the shunt Kelvin terminals.
5. Apply AC power and enable the unit via the front panel On/Off switch.
6. Verify there is 5V ±1% across the resistor. If necessary, adjust R45 to
measure 5.00V read back on the voltmeter.
7. Disable AC power to the unit.
8. Remove all connections to the remote analog control connector (J1),
except the jumper between pins 5 and 6.
4.3 ISOLATED ANALOG (OPTION) VERIFICATION AND
CALIBRATION PROCEDURE
All calibration potentiometers can be adjusted through access holes in the top
cover of the SFA Series unit. It is not necessary to remove the top cover to
perform the calibration procedures.
M550292-01 Rev G 4-3