Varian B-100 Manual De Instrucciones página 10

4476
b.
NOTE:
2–10
X-RAY
PRODUCTS
iii. Connect red wire to M1 at HV transformer secondary and make same exposure. (Do not change settings
from step ii.) Record MAS.
iv. Connect red wire to M2 at HV transformer secondary and make same exposure. (Do not change settings
from step ii.) Record MAS.
v. If MAS in steps iii or iv increases over MAS in step ii, connect red wire to the terminal that increased
MAS. (Any increase in MAS indicates MA meter is in anode circuit.) If the MAS in steps iii or iv has no
change with respect to ii or subtracts from ii then connect center section red wire to ground, or if balanced
MA is required connect to terminal that caused no change in MAS reading. (MA meter is in cathode
circuit.)
vi. If balanced MA metering is not needed for normal operation it is recommended to ground red lead after
calibration of MA.
Single Phase Generators (See Figure 2-1)
i. Ground red wire.
ii. Make an exposure at 80 kV 200 MA, 0.1 sec and record MAS reading.
iii. Connect red wire of center section to a point between the bridge rectifier and MA meter as shown in
Figure 2-1 and make same exposure as in step ii above.
iv. If MAS reading in step iii is greater than MAS in step ii, MA meter is in anode side of HV transformer
secondary. (A decrease in MAS reading indicates MA meter is in cathode circuit. Remove red wire
from junction of MA meter and rectifier and reconnect to ground.)
RATING CHARTS AND RADIATION OUTPUT ARE BASED ON CATHODE CURRENT. THE
RED WIRE IS CONNECTED TO GROUND AND MA METERING IS IN ANODE SIDE. ADD 12%
TO MA READINGS FOR TRUE TUBE CURRENT.
CENTER SECTION CONNECTIONS FOR B-160, B-170, B-180, B-200, B-400, B-500
SERIES OF TUBE HOUSING ASSEMBLIES (Three Phase Generators)
MA Monitoring Circuit
In cathode side (balanced
monitoring not required)
In cathode side (balanced
monitoring required)
In anode side of generator
(balanced monitoring
required or not required)
X-RAY TUBE ASSEMBLY AND
TABLE 2-1
Connect Red Lead
(Center Section) To
Separate ground
Anode side of high voltage
transformer MA circuit
Anode side of high voltage
transformer MA circuit
(Single Phase Generators)
See Section 2.2 (B)
INSTALLATION MANUAL