RESISTANCE NOT SAME AS MULTI-METER

Hi i have just purchased the series 4 DataTaker DT80 and CEM20 expansion modules.
ill keep it simple and quick, i have been testing with 390 Ohm 1% resister (same resister) and compared it with a multimeter.
results:

CEM20#2 = 394.2 Ohm's
CEM20#1 = 394.0 Ohm's
DataTaker = 391.6 Ohm's
Multi meter = 388.4 Ohm's

Is there something i can do other than use calc's to zero the resistances to show true values? 5 ohms difference is big.

Hi Wolfy27,

Unfortunately manual adjustment is required when you use 2 wire resistance, that is due to internal resistance of SSR. Only when using 4 wire resistance you do not need to make any adjustment.

Best regards,
Rudy Gunawan