Laurel Electronics LAUREATE SERIES DPM - Manual (Page 44)

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24. CALIBRATION
All ranges of the meter have been digitally calibrated at the factory prior to shipment. The
calibration equipment is certified to NIST standards. Calibration constants are stored in non-
volatile memory in EEPROM on the signal conditioner. This eliminates much of the analog
circuitry that causes drift and provides superior long term accuracy and stability.
Since the calibration is stored on the signal conditioner and analog output boards, all boards
may be mixed and interchanged without requiring recalibration. If recalibration is required, the
meter may be returned to the factory or any authorized distributor.
For the customer requiring on site calibration, an RS-232 or RS-485 option must be installed
to perform the calibration. The interface card may be temporarily installed and then removed
upon completion of calibration. Step-by-step instructions for calibration and the equipment
required is available from the factory.
25. SPECIFICATIONS
BASIC METER
Display
Type .................................. 5 LED, 7-segment, 14.2mm (.56") high digits & 3 LED indicators
Color .................................................................................................................. Red or green
Range ................................................................... -99999 to +99999 and -99990 to +99990
A to D Conversion
Technique (Pat.5,262,780) ...................................................................... Concurrent Slope TM
Rate ....................................................................... 60/s for 60 Hz NMR, 50/s for 50 Hz NMR
Output Update Rate ................................................................... 56/s at 60 Hz, 47/s at 50 Hz
Display Update Rate ................................................................... 3.5/s at 60 Hz, 3/s at 50 Hz
Noise Rejection
CMV from DC to 60 Hz ...................... Safety-rated to 250Vac, 4.2kVp per High Voltage Test
CMR from DC to 60 Hz ............................................................................................... 130 dB
NMR at 50/60 Hz ............................................................. 90 dB with minimum digital filtering
External Inputs/Outputs (CMOS/TTL Levels)
Hold input .................................................................................. 0 - holds display and outputs
Peak input .......................................................................................... 0 - displays peak value
Tare input ................................................................................. 0 - offsets input value to zero
Reset input ................................................................................ 0 - resets all meter functions
Function Reset input ........................................................ 0 - resets peak values and alarms
Decimal Point input ...................... overrides internal DP selections and controls DP position