Laurel Electronics LAUREATE SERIES COUNTER_TIMER - Manual (Page 50)

20. 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
nonvolatile memory in EEPROM on the main board , the V-to-Fsignal conditioner and on the
analog output board. The crystal on the main board is calibrated via the menu item "calib".
Using an accurate, known frequency, the meter is calibrated by entering the error of the in parts
per million. If the frequency reading is high, the value entered is negative and if the reading is
low, the value is positive.
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. Software for calibration of the V-to-F and analog output boards
is available from the factory.
21. SPECIFICATIONS
BASIC METER
Display
Type ...................................... 6 LED, 7-segment, 14.2mm (.56") high digits & 4 LED indicators
Color ................................................................................................................................ Red or green
Range ................................................................................................................ -999999 to +999999
A to D Conversion
Technique (frequency) .......................................................................................................... 1/period
Rate ................................................................................................ Gate Time + 30 mS + 2 periods
of the input signal (max.)
Gate Time Selectable 0 to 199.99 sec.
Zero Wait Time ..................................................................................... Selectable 0 to 199.99 sec.
Output & Display Update Rate ................................................................ same as conversion rate
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
Dual Channel Signal Conditioner
Types .................................................... AC or Pulses from NPN, PNP xistors, contact closures,
magnetic pickups, etc.
Channel A .......................................................................................................................... 0 to 1 MHz
Channel B ....................................................................................................................... 0 to 250 kHz
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