23
3. Calibration
Two types of calibration are available on the LMU 212 and LMU 217:
• Standard electrical calibration (see
paragraph 3.1
)
• Quick calibration with reference loads (see
paragraph 3.2
).
Paragraph 3.3
handles the calibration of the built-in test equipment B.I.T.E.
3.1
eleCtriCal Calibration (stanDarD)
3.1.1
Z
ero
Adjustment
on
the
voltAge
output
The following conditions are required for the zero adjustment on the voltage output:
• No load must be applied on the transducer.
• The micro-switch SWB9 (see
figure 3–3
) must be OFF.
• The micro-switch SWC2 (see
figure 3–2
) must be On.
Proceed as follows to carry out the zero adjustment:
1. Connect a digital millivoltmeter between terminals 15 (U
O/P
) and 9 (0 V) of the load
monitoring unit.
2. Adjust the potentiometers P6 and P7 to get a reading of 0 V ±10 mV on the millivoltmeter.
Figure 3–1
indicates the location of the potentiometers P1 to P10.
1 2 3
4 5 6
7 8
OFF
ON
9 10
SWB
micro-switches
REL1
REL2
REL2 LED
REL1 LED
Fig. 3–1 Location of the potentiometers on the load monitoring unit board
Содержание LMU 212
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