{"id":1911,"date":"2017-02-28T16:27:42","date_gmt":"2017-03-01T00:27:42","guid":{"rendered":"http:\/\/www.rbdinstruments.com\/blog\/?p=1911"},"modified":"2021-06-09T13:09:17","modified_gmt":"2021-06-09T20:09:17","slug":"32-095-x-ray-source-control","status":"publish","type":"post","link":"https:\/\/www.rbdinstruments.com\/blog\/32-095-x-ray-source-control\/","title":{"rendered":"32-095 X-ray source control"},"content":{"rendered":"

When the 32-095 X-ray source control is not working properly there are some easy\u00a0 possible solutions that you can check before sending the unit to RBD Instruments Inc. for repair.<\/p>\n

If the problem is that one filament works but the other one does not, then you should check the fuses located on the filament power supply board inside the 32-095 X-ray source control in the back left hand corner of the unit. (The other possibility is that the x-ray source filament is open.)\u00a0\u00a0\u00a0\u00a0 With the 32-095 power off, slide the unit out and remove the cover, then measure the resistance on the fuses.\u00a0 Usually it is easiest to just completely unplug the 32-095 and remove it from the electronics rack.<\/p>\n

The fuses are 5 amp slow blow and are shown in the board layout figure below.<\/p>\n

\"filament_board_fuses\"

Filament power supply board fuses<\/p>\n

The next most common problem is instability in the controller or flashing digits on the digital panel meter. These can be caused by high AC ripple on the +\/-15V or +5 V supplies on the local power supply board which is located in the front left hand side of the 32-095.<\/p>\n

The figure below shows the layout of the local power supply board and the location of the +\/-15V and +5V supplies.<\/p>\n

\"local

The picture below shows the points where you measure the +5v supply.\u00a0\u00a0 To measure the +5V supply, connect your test clips to the pins as shown in the picture below. Turn on the 32-095 power and then measure both the DC and AC voltage using a DVM. The correct value is +5.0 V DC (+\/- 100 mV) and the AC ripple should be less than 10mV.\u00a0\u00a0 If the +5V supply has a problem the DC will be more like 4V and the AC will be 1 to 2V. \u00a0Power supply board problems are usually caused by bad capacitors.<\/p>\n

\u00a0<\/p>\n

\"32-095

The pictures below show the test points for the + and \u2013 15V supplies.\u00a0\u00a0 The correct voltage values are + and \u2013 15.0V (+\/- 200 mV) and the AC ripple should be less than 20mV. If the DC voltage is low and the AC ripple is high then the supply has a problem.<\/p>\n

\"32-095

\"32-095

32-095 local power supply board +15V<\/p>\n

The figures below show the +5 and +\/- 15V local power supply board schematics.<\/p>\n

\"5V

5V schematic<\/p>\n

\"15

15 V schematic<\/p>\n

\u00a0<\/p>\n

Below is a table that lists common problems and possible solutions.\u00a0\u00a0 Sometimes the problems are easy to fix, but often the problem may be a hard to find bad capacitor, diode or integrated circuit.<\/p>\n\n\n\n\n\n\n
Problem<\/strong><\/td>\nPossible solution<\/strong><\/td>\n<\/tr>\n
No current on one filament<\/td>\nBad power supply board fuse, open filament on source<\/td>\n<\/tr>\n
No filament current but fuse is OK<\/td>\nBad PIC 645 regulator<\/td>\n<\/tr>\n
Unstable operation<\/td>\nBad capacitor on local power supply board<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

If the problem is not an easy fix then RBD Instruments can repair your 32-095\/96 x-ray source control and also provide you with a loaner unit to use while we are repairing yours.<\/p>\n

Additional test info:<\/p>\n

04-500\/548 X-Ray Source Filament Test <\/strong><\/p>\n

The following information is helpful in testing the condition of the filaments in 04-500 or 04-548 15 kV dual anode X-ray sources and in troubleshooting the 32-095 X-ray source control.<\/p>\n

\u00a0X-Ray Sources <\/strong><\/p>\n

On the big filament connector on the source, pins A and B (filament 1) and C and D (filament 2) should have less than 1 ohm of resistance. All pins should be open to ground.<\/p>\n

The HV connector (anode) should be open to ground. Check that with the X-ray high voltage supply OFF and the HV cable to the source disconnected.<\/p>\n

32-095 Test <\/strong><\/p>\n

Follow the 32-095 Outgas\/Activate procedure in the 32-095 manual.<\/p>\n

To bench check the 32-095, short pins A and B on the Pressure Interlock connector, and pins A and E on the Pump Control connector.<\/p>\n

You can use two large paper clips as dummy loads when testing the filament current.\u00a0 Put the clips on the end of the cable or on the filament connector on the back of the 32-095.<\/p>\n

\"32-095

High voltage switch connections:<\/p>\n\n\n\n

\"32-095