Doc# 100576 • REV C (Sept 2017) Page 19 of 42
The buered output common is protected against ground loop currents aecng the current
loop output with a 10kΩ resistance between the buered output common and the loop
common.
Metrix recommends using a ground isolated instrument or signal isolator. The meter, oscil-
loscope or analyzer used to measure the gap voltage or to observe the vibraon signal
(DYNAMIC OUTPUT) must have an input impedance of one megohm or greater.
The scale factor of the output signal is 200 mV/ mil.
Metrix recommends a maximum cable length of 15 (5 m) when connecng to the buered
output due to noise suscepbility caused by the high input and output impedances.
4. VERIFICATION AND CALIBRATION
This secon describes the steps to verify proper DPS operaon and to custom calibrate your
DPS to your specic probe and cable.
When using the MX2034 BNC connector, exer-
cise special care to prevent ground loops that could alter
the 4-20mA output, resulng in spurious alarms or ma-
chine trips. Such ground loops can occur when connecng
to grounded test equipment or mulple input test equip-
ment. Metrix recommends use only with ungrounded test
equipment, such as baery-powered portable meters,
or grounded test equipment with dierenal inputs (i.e.,
neither side of input connecon is ed to ground). Also,
cable lengths between the BNC connector and test equip-
ment should be kept suitably short (5m or less) to prevent
unwanted noise.
The DPS requires the probe and extension cables be
from the congured probe series, combine to the cong-
ured system length, and view the congured target mate-
rial in order to meet system range and accuracy
To Next Page
Loading...
Need help?
General
