Seaward DP6 - Manual (Page 15)

Operating Instructions Thermocouple Calibrator Type DP6
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KEYBOARD ENTRY
In this mode values may be entered calculator-style from the numerical keyboard.
Press the key marked KYB and then type the value required. The value will be
displayed as entered and is confirmed by pressing the OK key. Should a wrong value
be entered pressing the CLE key clears that value. If a value outside the range is
entered, then the display will blank eg. ---. Once the value is confirmed the polarity
can be switched automatically from + to - and zero can be selected immediately by
pressing the key marked ZER.
RAMPING KEYS
The value may be increased and decreased using UP/DOWN keys directly below
each digit. Follow the runway below the digit that requires changing, and press the
Ù key to increase and the Ú key to decrease the value. In this mode, it is possible
to ramp the output value up or down in steps of 0.1 - 1 - 10 - 100 and 1,000 steps
with the value flowing to the next digit when 9 or 0 is reached. This makes for a very
quick and flexible mode of operation.
MEMORY RECALL
The third method of value selection is via the memory recall facility. Once the
configuration is stored in the memory it may be recalled by pressing MEM and the
memory store number, the full configuration stored will be recalled.
COLD JUNCTION
The cold junction compensation has three possible operating modes as follows:
a) Fully automatic - in this mode instruments with their own built-in cold junction
compensation can be calibrated. In this case, the instrument under test should
be connected to the DP6 terminals using thermocouple wire or thermocouple
compensating cable. In this configuration any difference in temperature between
the test instrument and the DP6 will be compensated for by the emf generated
by the difference in temperature between the two end of the connecting wire.
IMPORTANT It should be noted that different grades of thermocouple cable and
thermocouple compensating wire are available. To achieve the best possible results,
cable of the best grade should be used. Please consult your cable supplier to ensure
this is achieved.