Setra System Model ASM - Manual (Page 4)

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4.2 Zero Adjustment
While applying zero pressure, zero offset may be adjusted by pressing the
send button to tare zero. If fine adjustment is needed on analog output, turn
the encoder wheel until desired compensation is seen on display.
Example for Voltage Output: If 0.0025 VDC is measured, where 0 VDC is
desired, turn wheel until -2.5mV is attained, then press send button.
Example for Current Output: If 3.990 mA is read on current meter, turn
wheel until +0.01 mA is attained, then press send button.
Zero adjustment should be done prior to span. To get better results, always
wait until unit has warmed-up before making any adjustment.
4.3 Span Adjustment
Span or full scale output adjustments should only be performed by using an
accurate pressure standard (electronic calibrator, dead weight tester, digital
pressure gauge, etc.) with greater or at least comparable accuracy to the ASM
transducer. With full range pressure applied to the high pressure port, the
span may be adjusted by pressing the send button to set span. If fine adjust-
ment is needed on span, and control pressure is applied at full pressure range,
turn encoder until target correction is achieved on LCD then press send but-
ton.
2 Line Alpha Display
LED Feedback
Single Button for Snap Span
(Digital Trim) or Sending
Analog Correction
Reset (Power) Switch
Rotary Adjustment Encoder
Wheel for Analog Zero or
Span Correction
Diagram 2
Pressure Ranges/Proof Pressure Specifications