Correction Required When An Extension Cable Was Used - KYOWA DPM-900 Series Instruction Manual

9-3-5 Correction Required When an Extension Cable was Used

Indoor measurement seldom requires an extension cable. By contrast, for outdoor measurement the
DPM-900/950 series has to be remote from a measuring point on occasions. If such is the case, place a
bridge box nearby a measuring point, then connect a bridge box to the DPM-900/950 series using an
extension cable. Note that a measurement thus obtained inevitably contains an error due to an extension
cable. The longer an extension cable is used, the larger a measurement error grows. In order to remove this
error, multiply a measured value by a suitable correction factor stated in the following table.
In addition, this correction method will not be free from a certain amount of error inducible to the kind of
an extension cable and the ambient temperature.
Correction factor when using the extension cable with the DPM-911/951
Extension Cable
Bridge Resistance
120 ohm
350 ohm
Correction factor when using the extension cable with the DPM-912/952
Extension Cable
Bridge Resistance
120 ohm
350 ohm
Correction factor when using the extension cable with the DPM-913
Extension Cable
Bridge Resistance
120 ohm
350 ohm
Shown in the above tables are correction factors applicable to the KYOWA extension cable (0.5 mm
4-conductor shielded cabtire cable) that is described in "6-3 EXTENSION CABLE N."
5 m 25 m
1.003 1.015
1.002 1.005
5 m 25 m
1.003 1.017
1.002 1.009
5 m 25 m
1.006 1.025
1.007 1.033
50
50 m 75 m
1.030 1.046
1.009 1.013
50 m 75 m
1.034 1.052
1.015 1.023
50 m 75 m
1.046 1.081
1.067 1.103
100 m 200 m
1.060 1.120
1.017 1.032
100 m 200 m
1.069 1.151
1.031 1.070
100 m 200 m
1.112 1.326
1.138 1.309
2 ,