If using a shorter leadout from the probe or thicker gauge cable, please ensure that the DP97 is in the correct wire recognition mode. This can be checked by pressing the SPAN s button ONCE.

Two numbers will be displayed e.g. 3-4. The first digit being the X parameter (e.g.3) and the second digit being the Y parameter (e.g.4). These displayed numbers will only be displayed momentarily.

Caution, pressing the SPAN s button more than once or holding it down continuously will alter the X-Y setting.

X Parameter

This is a configurable parameter. If the probe configuration is 4 wire but has a lead resistance of less than 80mΩ per leg, he instrument may recognise it as a 3 wire probe (showing 3-3); the SPAN s may be used to force the instrument into a 4 wire measurement mode by pressing SPAN

suntil X = 4. To verify, allow the DP97 to ead the currently selected channel and press SPAN s once; the display will now show 4-4.

X = 3

3 or 4 wire mode is allowable on either channel A or B i.e. A4, B3 or A3,

 

B4 or A3, B3 or A4; B4 (if both probes are 4 wire). I.e. 3 or 4 wire auto

 

Selected.

X = 4

4 wire mode is mandatory o n both channels A & B I.E. A4, B4.

 

Y Parameter

 

The Y parameter gives the actual measuring mode of the currently

 

selected channel (except differential).

 

 

Y = 3

3 wire measuring

Y = 4

4 wire measuring

 

 

Differential Mode

In A-B mode the SPAN s figure is not to be relied upon because the values displayed will be for the last channel which has been read by the instrument and this could be A OR B.

In order to verify status of each channel, select the channels A and B individually.

4. INSTRUMENT RE-CALIBRATION

Re-calibration of the DP97 is unlikely to be required routinely unless specified by user regulations. If this is performed by someone other than the supplier, guarantee of specification compliance may be invalid.