
Operating instructions
4point light 10W (V 4.58)
Page 101 of 130
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M
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If "Full calibration" is selected, the complete receiver transfer function will be calibrated by
using an internal 10 Ohms resistor. The instrument will determine gain, phase shift and
offset using this resistor as reference.
•
To achieve
full accuracy
calibrate the instrument
regularly
! Usually an
offset
calibration
should be sufficient. The necessary corrections after a new calibration are
usually only a fraction of a microvolt for the voltage and a fraction of mrad for the phase
shift.
•
Before
any
calibration
make sure that all
external cables are disconnected
.
•
Additional resistors are not necessary. The instrument has an
11 Ohms build-in
reference resistor
that will automatically be switched into the signal circuits in calibration
mode.
•
Repeatedly performing a
full calibration
is recommended
for high resolution IP
measurements.
CALIBRATION
Offset calibration
Full calibration
Reset calibration
Fig. 8.116: Miscellaneous
– Calibration
1. Select calibration mode with [
] and [
]
2. Confirm selection with [RET]
8.11.2.1 Offset Calibration
OFFSET CALIBRATION
Frequency: 1.25 Hz
Averages: 16(8..128)
Fig. 8.117: Frequency and number of averages
Menu item
Function
Frequency: 1.25 Hz
Frequency: 0.26
– 30 Hz/ALL
Averages: 16 (8 … 128)
Number of averages
Tab. 8.85: Offset calibration menu