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15
Baker Instrument Company
The Measure of Quality
4.
Check at the terminal block adjacent to the high voltage transformer T1 at the orange
wire for the same AC voltage starting with the output control to full counter-
clockwise position and than at ½ output. If not present, see the section on the Zero
Start Interlock does not engage.
5.
Locate the secondary T1 high voltage transformer wire connected to D3 anode on the
Stack board and disconnect. Connect a P6015A high voltage scope probe or
equivalent to the T1 secondary wire with the probe negative lead connected to chassis
ground. Set the volts/div on the oscilloscope to 2 volts and the timebase to 5ms.
Turn the output control approximately to ½ output. This measurement should be
14kV AC peak to peak.
6.
Verify that all other primary and secondary wires of T1 are connected to their
respective destinations with a digital multimeter. Ensue that power is off and
disconnect when making these measurements. If measurement in step 5 is not present
and all connections are verified, then replace the high voltage transformer T1.
7.
Reconnect T1 secondary wire and lift D3 cathode on the Stack board. Connect the
P6015A probe to this point with the negative lead to chassis ground and turn output
control to ½ output. Set scope settings to the same as in step 5. This measurement
should be approximately 7kV AC with the negative portion clipped by the diode. If
not present replace D3 on the Stack board.
8.
Check the SCR cathode to anode resistance for Q1-Q10. Ensue that the power is off
and disconnected. These measurements can be obtained by measuring across R1
through R10. Replace any SCR’s that are shorted. Good measurements will be 700K
ohms or higher while defective SCR’s will have much lower readings.
9.
Check the resistance of the 25K-ohm 25-watt resistor that connects to the J5 wire
from the Stack board. Replace if open.
10.
Check continuity from lead 1 alligator clip to the 25K 25 watt resistor. If open,
replace test lead 1. Check continuity from the ground lead alligator clip to the
Discharge board ground stud. If open, replace the ground lead.
N
O
S
URGE
V
OLTAGE DISPLAY
1.
Ensure the tester function switch is in the surge mode and that the test lead select
switch is in a test lead selection. Set the tester to 500 volts/division and at
6
µ
S/Division. Connect test load across test leads.
2.
Measure at T2 pin 2 with a digital multimeter, connect positive lead at this point and
the negative lead to chassis ground. Set the meter to AC volts. This point should be
at line voltage upon turning on/off switch to the on position.