Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 61)

Your meter converts display readings into an independently-scaled and-offset isolated voltage and/or current
analog output. Isolation is accomplished via opto-isolators on the board. Your meter has the capability of
transmitting SIMULTANEOUS voltage and current outputs although when this is done, the current analog output is
not as accurate.
12.1 Features Overview
1. Precise analog levels are generated from digital code using a proprietary ASIC chip.
2. Voltage (to 10 V) is available at the same time as current (to 22 mA), but the total current drawn should not
exceed 24 mA.
3. Load resistance for the voltage output can be as low as 500 ohms (20 mA at 10 V out) when current output is
not used.
4. Loop resistance for the current output can be as high as 600 ohms (12 volts compliance) with negligible current
from the voltage output.
5. Both outputs are galvanically isolated from both power and measurement circuits of the meter: 354 V per IEC
spacing, 500 V test.
6. Precision calibration is applied by the meter to either the voltage output or the current output (but not to both
simultaneously). When both outputs are used simultaneously, the non-calibrated output is stable but does
require external adjustment if fine-trimming is required.
7. Independent, 15-bit resolution OuTput SCale and Offset (OT.SC.OF) can convert a wide range of meter
readings to the desired current or voltage output span.
8. The output resolution permits good accuracy for turndown ratios (offset/span) as high as 100:1.
9. 50°to 104°F (10°to 40°C) accuracy within 0.1% after installation calibration.
10. 10% to 90% step response time is 50 milliseconds (plus filter delay, if any, programmed for the analog output).
11. Configurable so that output will track the PEAK or VALLEY measurement.
12.2 Unlocking
1. Press the ‘MENU’ button until “L3 CNF” is displayed, then press the ‘MIN’ button until “L3C.7” is displayed.
2. Press the ‘MAX’ button (if required) to set “L3C.7=0”, unlocking the choice of current or voltage as the
calibrated output.
3. Press the ‘MIN’ button (and the ‘MAX’ button if required) to set “L3C.8=0”, unlocking OT.SC.OF.
4. Press the ‘MENU’ button to store these choices.
5. If your analog board is NEWLY INSTALLED, you will need to enter the four trimming constants (refer to the
one-time only procedure in Section 12.5). To unlock this feature, press the ‘MIN’ button and then the ‘MAX’
button to set “L4C.6=0” and store by pressing the ‘MENU’ button.
12.3 OUT.CNF: Configuring The Output
1. Press the ‘MENU’ button until “OUT.CNF” is displayed, then press the ‘MIN’ button to display “OUT.1=0” or
“OUT.1=1”.
2. Press the ‘MAX’ button to set “OUT.1=1”if you wish the analog output to be driven at once when you return to
run mode. (You can leave this as “OUT.1=0” and complete all the other programming if you wish to activate the
analog output at a later time by returning to this configuration bit).
3. Press the ‘MIN’ button (and the ‘MAX’ button if required) and set “OUT.2=0” for calibrated VOLT output (0-1 V,
0-5 V, 1-5 V, or 0-10 V) or “OUT.2=1” for calibrated CURRENT (0-20 mA or 4-20 mA) output.
4. Press the ‘MENU’ button to store these choices (the rest of the “OUT.CNF” byte controls BCD and display-
flashing features).
After pressing the ‘MENU’ button again, you advance to “OT.SC.OF” (Output Scale and Offset).
12.4 OT.SC.OF: Setting Output Scale And Offset
Any two data points can be used here: a data point is specified by a value of the display (“READ”) and the desired
output (“OUTPT”) for that display.
1. Press the ‘MIN’ button to see “READ1” and then use the ‘MIN’ and ‘MAX’ buttons to enter a small display value,
for example, “000.000”, where the center decimal point position is used as an example.
2. Store this value by pressing the ‘MENU’ button and then you see “OUTPT1”. Use the ‘MIN’ and ‘MAX’ buttons
to specify the desired output value, for example, “04.0000” if current calibration had been selected (“OUT.2=1”),
or “00.0000” for voltage.
CF 67 56 M1291/N/0403 11279ML-02 Rev. A