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90M9-AG Invasive Sensor
The 90M9-AG is an invasive sensor. The mAs sensor connects to the 4-pin connector labeled mAs on the
digitizer using a 4-m cable and to the X-ray generator with safety shrouded banana jacks. It is intended to
be inserted in series with the X-ray generator return. The value of mAs is computed by summing mA values
during the part of the kV waveform (requires kV sensor in beam) defined by the same thresholds that are
applied to determine its width, generally 75% of kVp. Average mA is mAs divided by this width.
Key features:

Automatic power control extends battery lifetime

Automatic zero

Measurement synchronized to kV waveform

.001 to 9999 mAs and 10 uA to 2A dynamic range with no range switching

Measures absolute value (no rectifier drop and optimum noise rejection)

mA-waveform

2.33-kHz -3-dB bandwidth
Specification / Technical Data
Full-scale 2000 mA or 9999 mA
mA accuracy 0.2% of reading at dc plus resolution of +/-0.015 mA or 3-4 digits
mAs accuracy (1-s pulse): 5 As or 0.2% of reading; resolution of 0.001 mAs
Absolute value of bi-polar 720 Hz waveform accurate to 2.5%
Bandwidth 2.33 kHz, -3 dB
ON/OFF controlled from 9096 or 4086 control unit (ON only when a kV
function is active)
Batteries 1 x 9.0 V Alkaline