10A48.4 SETUP AND/OR OPERATING CONSIDERATIONS
After this initial setting, there is no further need to adjust the potentiometer controls
unless a different type of flowmeter or a different cable length is to be used with the
10A48.
3.b CONFIGURATION AND CALIBRATION
For initial configuration of the ANALOG INPUT CHANNEL dedicated to a Model 10A48
card’s RATE-OF-FLOW subchannel (No. 1), see the general remarks on System 10
“real-channel” configuration in Manual Section 1.G.1 and elsewhere in the
System 10
Guidebook
. This channel must be assigned a “type” code of 40.
To calibrate the Model 10A48's RATE-OF-FLOW subchannel (No. 1), you should turn
ON the system EEPROM Switch and apply a SCALING FACTOR (EMM) command of
EMM x = i [CR]
where “x” is the number of the system data channel assigned to the 10A48's Sub-
channel No. 1 and “i” is the
actual flow rate at 2000 Hz, expressed in the desired engi-
neering units.
Note that the FREQUENCY CALIBRATION (FRQ) command will NOT
produce correct calibration for the 10A48.
3.c USE OF TOTALIZER OUTPUT TO OBTAIN A
TOTAL VOLUME OR TOTAL MASS READING
As mentioned in Section 1, above, the 10A48's pulse-train TOTALIZER OUTPUT is pre-
cisely proportional to the measured rate of flow, and is issued both from the 10A48's
rear I/O Connector (
Pin 4) and from a wire-wrap pin on the mainframe's Analog Moth-
erboard that connects to
Pin 42 of the 10A48's Slot Connector.
By connecting this signal to a
Model 10ACT01 Counter/Timer Card or to a Model
10ACC-4 Totalizer Card
, you can count the number of flowmeter “pulses” that have
occurred over a given period of time. From this data, along with the calibration data
supplied with the flowmeter itself, you can obtain a
total volume or total mass reading
for that period, in any desired engineering units.
1. Make sure the system EEPROM Switch is OFF, and turn OFF the System 10 main-
frame.
2. Remove the 10A48 card from its mainframe slot. For “Card Insertion and
Removal,” see Manual Section 1.B.
3. Locate the solder pads labelled “TOTAL” on the bottom (non-component) side of
the 10A48 board.
4. To make the TOTALIZER OUTPUT available both at Pin 4 of the rear I/O Connector
and at Pin 42 of the Slot Connector, apply a drop of solder to bridge the two pads.
5. Reinsert the 10A48 card in its mainframe slot.
6. Connect the TOTALIZER OUTPUT to the Model 10ACT01 or 10ACC-4 (for pin con-
nections, see the respective section of the
System 10 Guidebook).
7. The 10ACT01 or 10ACC-4 Channel No. “y” which is to read the TOTALIZER OUT-
PUT must be set to a “TYPE” code of “C2” and a count increment (1, 10, or 100)
that satisfies your total volume or mass requirements (again, see the 10ACT01 or
10ACC-4 manual section for details).
10A48 FLOW CARD
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