User Guide

NPL-4/5
System Module and User Interface Nokia Customer Care
Page 60 Copyright © 2004 Nokia Corporation. All rights reserved. Issue 1 05/04
Testpoints
Set/Reset
Set/Reset pulse after DC separation capacitor C314
Testpoint J327
Figure 22: Timing and Voltage Level l
VBRIDGE
Vbridge supply voltage for magnetometer’s measurement bridges. Vbridge voltage is
always on during measuring session.
Testpoint J326
• Nominal voltage level 2.2V ±2%
Channel output A
Channel A output from measurement bridge A. Signal is differential type.
Testpoints J331(+), J332(-)
Nominal voltage level is 1.1V to ground. Differential voltage level is 0.0V
Channel output B
Channel B output from measurement bridge B. Signal is differential type.
Testpoints J329(+), J328(-)
Nominal voltage level is 1.1V to ground. Differential voltage level is 0.0V
Vbridge
S/R (general)
2.2V
set pulse
reset pulse
1ms
>40ms
>20ms
In current scale S/R pulses nominal values are 1A
pulses over S/R coil
Duration 2µs
2.8V
Vbridge
S/R (general)
2.2V
set pulse
reset pulse
1ms
>40ms
>20ms
In current scale S/R pulses nominal values are 1A
pulses over S/R coil
Duration 2µs
2.8V
Vbridge
(J326)
S/R (J327)
2.2V
set pulse
reset pulse
2.8V
Vbridge
(J326)
S/R (J327)
2.2V
set pulse
reset pulse
2.8V
Voltage levels and wave shapes on
Testpoint J326 and J327
Timings on Vbridge and over S/R coil