Radcal ACCU-GOLD2 User Manual

74
90M10-AG Non-Invasive Clamp-on Sensor
The 90M10-AG is a non-invasive clamp-on sensor that requires kV to be in beam. The mAs sensor
connects to the 4-pin connector labeled mAs using a 4-m cable and couples to the X-ray generator by
clamping to the X-ray anode HV cable (clamps up to 23 mm in diameter). 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. To measure the anode
current, clamp on the anode cable with the arrow on the clamp pointing towards the X-ray tube.
Key Features
 Automatic power control extends battery lifetime
 Automatic zero
 Measurement synchronized to kV waveform
 Maximum 9999 mAs and 0.7mA (RMS noise) to 2A dynamic range with no range
switching
 Measures absolute value (no rectifier drop and optimum noise rejection)
 Measures absolute value of mA
 mA-waveform
S
pecification / Technical Da
ta
R
ang
e
19
0
0 mA or 9999 mA
s
(2
-
2
000 mA when used with 909
5)
m
A accura
cy
±
4% of reading (Limited by 0.7mA RMS noise below 18mA
)
m
As accura
cy
±
4% of reading (Limited by 0.7mA RMS noise below 18mA
)
B
andwid
th
2
.33 kHz
,
-
3
d
B
O
N/OF
F
O
N/OFF controlled from Acc
u
-
G
old, Acc
u
-
P
ro/Acc
u
-
kV
(ON only when a kV function is active)
B
atterie
s
2
x IE
C
-
L
R6 (1.5V AA Alkaline) Lifetime: Approximately 3
5
continuous operating hours
The sensor responds to the net current passing through the opening. This means that current flowing in
the cable shield can add or subtract from the tube current. To a lesser extent, nearby electrical circuits can
also affect the measurement, as can the motion of the cable within the clamp opening.
The instrument program compensates for the effect of these extraneous signals by continuously
measuring the sensor output and computing a zero correction. When a measurement begins the most-
recent zero measurement is stored and used to correct the reported value. This correction is limited to 50
mA; if the zero is larger than this value a measurement error occurs.
Extraneous signals are generally not a problem for tube currents above about 100mA.
For measurements where errors in the 5 mA range are significant, Radcal recommends the following:

Radcal ACCU-GOLD2 Specifications

General

Brand	Radcal
Model	ACCU-GOLD2
Category	Measuring Instruments
Language	English