Calibrating The Measurement Chain - HBM K3607 Bedienungsanleitung

K3607
3

Calibrating the measurement chain

•
Connect the calibration instrument to the measurement chain you wish to
calibrate in place of the 350-Ω SG transducer. If there is an extension cable
on the measuring amplifier, leave it in place in order to capture the ohmic
and capacitive cable effects.
•
Use S1 to preselect the desired polarity of the measurement signal.
•
Set S2 (calibration step switch) to zero.
•
If necessary switch the measuring amplifier to full bridge (K 3607 operates
as a full bridge).
•
Balance the measuring amplifier and subsequent instruments to zero in
accordance with their operating manuals and if necessary carry out
capacitance adjustment.
•
Use the calibration value switch S3 and the calibration step switch S2 to
set the desired calibration signal:
Calibration value in
mV/V
0.5
1.0
2.0
5.0
10.0
Tab 3.1: Calibration signal in mV/V as a function of the switch settings on the K3607
•
Set the measuring amplifier to the desired output signal in accordance with
its operating manual. In principle the measuring amplifier should be
calibrated in the measuring range you intend to use for measurement. If the
measuring range of the amplifier is changed, the switching error needs to
be taken into consideration.
*)
Effect of the calibration step switch (S2):
The grading error for the percentage steps as set out in the specifications will be maintained for every
step if the internal resistance Ri of the bridge excitation source plus cable is v 1Ω. For an internal
resistance Ri v 4Ω the error in the calibration steps is kept at between 0 and 50 %.
For a six-wire circuit the tolerances are maintained if the excitation voltage to the K 3607 is readjusted
precisely enough.
A0833-3.0 en/de
0 10 20 30
0 0.05 0.1 0.15
0 0.1 0.2 0.3
0 0.2 0.4 0.6
0 0.5 1.0 1.5
0 1.0 2.0 3.0
*)
Calibration step in %
40 50 60
0.2 0.25 0.3
0.4 0.5 0.6
0.8 1.0 1.2
2.0 2.5 3.0
4.0 5.0 6.0
70 80 90 100
0.35 0.4 0.45 0.5
0.7 0.8 0.9 1.0
1.4 1.6 1.8 2.0
3.5 4.0 4.5 5.0
7.0 8.0 9.0 10.0
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HBM