Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
D.5.1
Disassembly of Detectors
Follow these instructions to disassemble a detector (see Figure D-4).
CAUTION
The detectors contain CMOS components and are subject to static electricity
damage. Use correct safety procedures, protective devices and clothing to prevent
static discharge before opening a detector enclosure.
1. Remove screws (1) and (2). Take off the sleeve holder plate and slide the sleeve off the cap
assembly.
2. Position the detector so that the Pre-Amp assembly (the board with components) is visible.
Locate the detector element leads. They are on the end of the PC board nearest to the detector
housing assembly. Remove the solder from the leads of the detector element, and remove the
leads from the holes in the PC board. Straighten the leads.
3. Unscrew the detector housing assembly from the cap assembly. Use the wrench flats on the
housing assembly which are located closest to the cap assembly to remove the housing assembly.
The detector element will remain attached to the housing assembly.
If the Spring Washers fall out when the detector housing assembly is removed, they should be
replaced as shown in Detail A of Figure D-4.
D.5.2
Replacement of Detector Element
These are instructions to replace the detector element (see Figure D-4). A detector element should be
replaced in the field only if a Giga-tronics Programming Accessory Kit (P/N 16976) is on hand to
program a new PROM with the characteristics of the new element, and if the required equipment for
measuring Cal Factor is available. If either or both of the above items are not available, the entire
detector should be returned to the factory for element replacement.
The Cal Factor is the frequency response of the detector with respect to the 1 GHz response, expressed in
dB. If the Cal Factor at 10 GHz is -0.2 dB, it means that the detector output voltage at any applied power
level is 0.2 dB lower at 10 GHz than at 1 GHz.
1. Remove the old detector element from the detector housing assembly by pulling the element
straight out from the Assembly.
CAUTION
Do not twist the element as you remove it. Doing so could damage the center
conductor of the detector housing assembly.
2. Take the new detector element out of its protective packaging and carefully straighten the leads.
Do not pull sharply on the leads or they may come off.
3. Carefully insert the new detector element into the detector housing assembly. Gently push on the
detector element to press the detector element pin into the center conductor of the detector
housing assembly. Once the element has been inserted, try gently to pull it back out of the
housing assembly. If there is resistance, the element is inserted correctly. If the element comes
out easily, the element has not been correctly inserted into the center conductor. Remove the
D-8 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009