Installation, Operation and Service Manual
LKP Series
© 2016 DynAmp, LLC
Page 16
041749 K
NOTE
You cannot get good ohmmeter readings if the head is on a live bus. The coils pick
up induced voltages from any rectifier ripple. The Hall plate resistance changes in a
high magnetic field.
Notes on Table 5.1 below:
1.)
BUS CURRENT MUST BE ZERO when taking resistance measurements!
2.)
Use a high impedance DMM set on the lowest range appropriate for the
measurement. Measurements are made between cable leads listed, at Metering
Unit end of Cable. The resistance values shown in the table are for readings
obtained with cable disconnected from the Metering Unit. Split channels 1, 5, 9 and
13 for will read half the resistance values listed in the table when measured with all
the cables connected to the Metering Unit. Also note that the Hall device current
supplies are connected in parallel for each Measuring Head quarter, therefore, the
resistance values will read one quarter the resistance values listed in the table when
measured with all the cables connected to the Metering Unit
3.)
These resistance readings are the room temperature values of the copper channel
coils. Measured values can be 50% higher if head is hot and/or cable length is
longer than 30 feet.
