Loma IQ2 Service Manual page 97

Figure 3 Exploded View of TP8 & 9 and Earthing Pillar
1. Adjust the oscilloscope time base until the white noise is clearly visible
and the volts per division to 100mV.
2. The channel noise level should be less than 500mV peak to peak.
3. Adjust the oscilloscope time base to its slowest setting and the volts per
division to a setting of 1V.
4. Using the "Tune for Resistive Wand" supplied with your detector, pass
the wand back and forth through the centre of the aperture and record the
peak to peak voltage value seen.
5. Transfer the probe to TP8 "R" channel (or use the black wire connection
pin on PL1) shown in
test wand, the peak to peak value observed for the test wand should not
be > than 1/5th of the recorded "X" channel voltage.
6. To check the phase integrity for dual frequency types then change the
frequency selection to LOW in the frequency menu position for the
product memory chosen. Repeat all the above tests for the lower
operating frequency.
OSGO
One of the many features of your detector is automatic fault monitoring of basic
detector functions, one of those functions is monitoring of the transmitter
voltage.
The transmitter provides the high powered signal required to enable the
detection of metal, should that signal fail then the detector would no longer
detect metal of any size.
Module 9095
TP8
PL1
TP9
Figure
Earthing
pillar
3. Repeat the test for white noise and the
Functional Testing
7-5