Retuning The Internal Antenna: Trim Capacitor C65 - Feig Electronic OBID i-scan ID ISC.M02 Installation Manual

®
OBID i-scan HF

3.4.3 Retuning the internal antenna: Trim capacitor C65

The antenna of the ID ISC.M02 can be detuned as a result of various ambient conditions such as
nearby metal objects (see 8.5.1. Metallic surroundings). This detuning can be compensated to
some degree using the trim capacitor C65.
The integrated antenna can be retuned with the aid of an oscilloscope (bandwidth ≥ 20 MHz). To
do this, short the GND terminal of the oscilloscope probe with the probe point and hold it over the
circuit board of the ID ISC.M02. The probe then forms a measuring loop for the radiated magnetic
field of the ID ISC.M02. The distance between the oscilloscope probe and the ID ISC.M02 should
be between 0 and 3 cm.
Use the software command „RF-ON" (0x6A) to turn on the HF field of the ID ISC.M02. A 13.56
MHz signal should be visible on the oscilloscope screen.
To tune the internal antenna, now set the signal amplitude of the 13.56 MHz signal to maximum
using trim capacitor C65.
Turn C65 to set amplitude
to maximum
ID ISC.M02
FEIG ELECTRONIC GmbH
Installation
V1 V2
X4
X1
J1
C73
C65
X3
Fig. 8
: Trim capacitor for retuning the antenna
Fig. 9
: Configuration for tuning the internal antenna
Page 17 of 27
Trim capacitor C73:
DO NOT CHANGE !!!
J2
X2
J3
Trim capacitor C65:
Retuning the
internal antenna
ID ISC.M02
M20301-4e-ID-B.doc