A-M Systems
131 Business Park Loop, P.O. Box 850 Carlsborg, Wa 98324
Telophone: 800-426-1306 * 360-683-8300 * FAX: 360-683-3525
E-mail: [email protected] * Website: http://www.a-msystems.com
16
Common-Mode Rejection
The following proceedure calibrates Channel 1.
Controls
Inputs / Observations
Adjust / Check
LOW CUT-OFF: 1 HZ
Tie
PROBE+
to
PROBE-
and
HIGH CUT-OFF: 1 KHZ
apply a 1 V, 100 Hz signal to both
Observe the voltage at TP100
Adjust T102 for a minimum
with an oscilloscope
voltage (typically only a few
mV), however this voltage
should not be a “clean”,
undistorted sine wave due
to the balanced gains of the
differential amplifier
Repeat this proceedure for locations TP200 and T201 to calibrate Channel 2.
Impedance
Current Injection
Controls
Inputs / Observations
Adjust / Check
Observe TP300 with an
Adjust T300 for a maximum
oscilloscope
p-p output
Check that the output
signal is 1 kHz
Observe voltage at
OUTPUT
Adjust T301 for 2 V p-p
Operation Test
Controls
Inputs / Observations
Adjust / Check
MODE: INP
Connect a 10 M
resistor between
PROBE+
and
PROBE-
Observe voltage at
OUTPUT
Adjust
CAPACITY COMP.
clockwise until just before
the signal oscilates
Check that the voltage is
1 V p-p at 1 kHz
Repeat this proceedure to calibrate Channel 2.
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