Seaward DP6 - Manual (Page 17)

Operating Instructions Thermocouple Calibrator Type DP6
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MEMORY
The DP6 has 10 memories for each thermocouple type and mV range, making a total
of 130 memories in total. To store a configuration, first set the DP6 to the complete
configuration that you wish to store, including measure/source mode, cold junction
configuration, units and value if in source mode. Press the MEM key followed by the
key directly below the STO. The right hand display then asks for a number - 0 ... 9
- this is the memory store number. Key in the number that you wish to store the
configuration under, using the left hand key pad. To recall a memory configuration
press MEM and then the key below the RCL. Again the display will ask for the
memory number that you wish to recall. Key in the number and the DP6 will
immediately be reconfigured to that memory store.
CALIBRATION
The calibration of the DP6 can be simply and easily carried out from the front panel.
All the calibration constants are stored digitally and no mechanical adjustments are
necessary. It is only necessary to calibrate the Mv and V ranges, the conversion to
temperature is carried out by the micro-processor. The equipment required is a
precision digital voltmeter with at least 1 microvolt resolution and a dc voltage
calibrator with 1 microvolt steps or better and a maximum value of at least 1.5 volts.
To enter the calibration routine press the MEM key, the menu will then give you the
choice of selecting the CAL option. Press the CAL key and the option of CAL or
PRINT will be given, pressing CAL again takes you into the calibration mode. The
display will ask for a passcode to be entered; the factory-set passcode is 9252, but
this can be changed by the user. Enter the factory passcode via the numerical
keypad. The display will then ask if you require to change the passcode.
CAUTION: If the passcode is changed, make a careful note of the new one.
However, should you forget, it will be necessary to contact the CROPICO Sales
Office or your local service distribution centre who will supply a master code
number. If this should be needed, you will be required to have the calibration counter
number available. The calibration counter will increase by 1 each time the user
enters the correct passcode.
Once the correct code is entered, the option to calibrate the MEASURE, SOURCE
or COLD JUNCTION is given. Press the key below the option required and proceed
with the calibration as described below.
MEASURE: After selecting the calibrate measure mode, connect a dc voltage source
to the terminals. The voltage source must have at least 1 microvolt resolution and be
capable of generating up to 1.5 volts with uncertainty of at least 5 ppm.
Follow the prompts from the right hand display which will ask you to first inject 0
Volts. With 0 Volts injected, press the CAL key and the display will ask you to WAIT
WHILE CALIBRATING. Upon completion of the calibration, the display will require
the next value +10mV; follow the same procedure, inject +10mV from the precision
source and press CAL. Repeat this procedure for all values requested. On