Reference Voltage Calibration; Rate Current Calibration - DANIEL 2234 Manual

__________________________ MODEL 2234 DIGITAL FLOW COMPUTER

4.3.2 REFERENCE VOLTAGE CALIBRATION

A. Attach the positive lead to TP2 (TP2) and the negative lead to TP3 (TP1).
The voltmeter should read +5.000 volts ±0.04%. This is a check; if the
voltage is not within tolerance, repeat the power supply adjustments.
B. Use Command Codes 98 and 99 to adjust the analog zero and span. Press
"98 CMD". The alpha-numeric display will display the analog zero value in
hex, which should read OE4 to represent +1.000 volts. If it is not OE4,
adjust R28 (R2) or input zero on PC Board No.1 until OE4 is indicated.
Press "99 CMD". The alpha-numeric display will display the analog span
value in hex, which should read FIC to represent +5.000 volts. If it is not
FIC, adjust R34 (R3) or input span on PC Board No.1 until FIC is indicated.
The input zero and input scan adjustments interact with each other.
Therefore, repeat procedures above until both readings are correct without
further adjustments.

4.3.3 RATE CURRENT CALIBRATION

A. Complete the Rate Voltage calibration outlined in paragraph 4.3.1.
B. Temporarily disconnect the wire going to terminal 37 (located at the rear of
the unit; move the power supply to one side temporarily.) Connect your
probes between terminal 37 and the wire you disconnected with the digital
voltmeter set to the ammeter function. You will check the current between
terminal 37 and the wire you disconnected. If no visible wire is connected
to terminal 37, measure between terminal 37 and common (terminal 57).
C. Move switch to "ENABLE" position. Enter Read Code 11 to display the
Mass Rate Full Scale in LBHR. Make a note of this total. "Enable" the
computer and enter the total into Read Code 18 (full scale volume rate in
LBHR).
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