WIKA CPH6300 - Handbuch (Seite 26)

6 Commissioning, Operation
26 WIKA Operating Instruction, Model CPH6300
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6.6 Universal Output
The universal output can be used either as serial interface (for USB6300 interface converter) or as
analog output (0…1V). If the output is not needed, it is strongly recommended to deactivate it (Out
oFF) to lower power consumption. This increases battery life time.
Pin assignment:
4: external supply +5V, 50 mA
3: GND
2: TxD / RxD (3.3V Logic)
1: +U
DAC
, analog output
CAUTION!
Only suitable adapter cables are permitted (WIKA-accessories)!
6.6.1 USB Interface
The device can be connected to a USB interface of a PC by the electrically isolated interface
converter USB6300 (WIKA-accessory). The data is transmitted binary-coded and protected against
transmission errors by complex safety mechanism (CRC).
As Operating and evaluation software for the integrated logger function you can use the Software
GSOFT.
6.6.2 Analog output
An analog voltage 0…1V can be tapped at the universal output socket (mode: “Out dAC”).
The analog output can be easily scaled with DAC.0 and DAC.1.
Please take care not to load the analog output too heavily, otherwise the output value will be
distorted and the power consumption will rise. Loads up to approx. 100 kOhm are unproblematic.
If the displayed value goes beyond DAC.1 the output voltage will be 1V.
If the displayed value falls below DAC.0 the output voltage will be 0V.
In error case (Err.1, Err.2, ----, etc.) the output voltage will be slightly higher than 1V.
6.7
Input adjustment
The zero point and slope of each measuring inputs can be adjusted with the parameters offset
(“OFFS”) and scale (“SCAL”). A reasonable adjustment presumes reliable references. The
reference should have 3-4 times better accuracy.
If the inputs are adjusted (i.e. offset and scale are different from default settings) the device will
shortly display “Corr” after turned on.
Default setting for offset and scale are ‘off’ = 0.0, i.e. inputs are not changed.
Zero point correction:
Displayed value = measured value – OFFS
Zero point and slope correction:
Displayed value = (measured value – OFFS) * (1 + SCAL / 100 )
6.8
Real Time Clock („CLOC“)
The real time clock is used for chronological assignment of the logger data and calibration points.
Please check the settings when necessary.
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