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11A-series plug-in NVRAM replacement: Difference between revisions
11A-series plug-in NVRAM replacement (view source)
Revision as of 09:27, 13 February 2019
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==WRITING THE SERIAL NUMBER INTO NVRAM== | ==WRITING THE SERIAL NUMBER INTO NVRAM== | ||
IMPORTANT: Both 11400 main frame and plugin jumpers need to be installed to write the serial numbers | '''IMPORTANT: Both 11400 main frame and plugin jumpers need to be installed to write the serial numbers | ||
or the 11A52 high frequency calibration constants into NVRAM. | or the 11A52 high frequency calibration constants into NVRAM. | ||
The 11300 series mainframes do not have a “Cal Lock” jumper but still allow the serial number to be written. | The 11300 series mainframes do not have a “Cal Lock” jumper but still allow the serial number to be written.''' | ||
The relevant plugin jumper is J611, (J400 on 11A71). | The relevant plugin jumper is J611, (J400 on 11A71). | ||
For writing the plugin serial number and the 11A52 calibration constants, J611 needs to be in the “horizontal position”. | For writing the plugin serial number and the 11A52 calibration constants, | ||
J611 needs to be in the “horizontal position”. | |||
(In the 11A71, this is the two pins toward the instrument top.) | (In the 11A71, this is the two pins toward the instrument top.) | ||
For normal operation the jumper is set to the “vertical position” (bottom in 11A71). | For normal operation the jumper is set to the “vertical position” (bottom in 11A71). | ||
The mainframe jumper on 11400 series mainframes is located on the large bottom board in the front of the instrument. | |||
The mainframe jumper on 11400 series mainframes is located | |||
on the large bottom board in the front of the instrument. | |||
Remove the mainframe bottom cover. | Remove the mainframe bottom cover. | ||
The jumper, labeled “Cal Lock”, is located about 1” away from the board’s (left to right) center on the CRT side of the instrument | The jumper, labeled “Cal Lock”, is located about 1” away from the board’s (left to right) center | ||
on the CRT side of the instrument | |||
and centered in the front to back dimension of the bottom board. There are just two pins, | and centered in the front to back dimension of the bottom board. There are just two pins, | ||
there is no third pin to hold the jumper during normal operation. | there is no third pin to hold the jumper during normal operation. | ||
If the jumper is missing, one has to be stolen from some two pin shorting socket, | If the jumper is missing, one has to be stolen from some two pin shorting socket, | ||
preferably from another instrument such as a plugin not in use. You may also use an alligator clip. Be careful. | preferably from another instrument such as a plugin not in use. | ||
You may also use an alligator clip. Be careful. | |||
Establish communications between the mainframe and a personal computer with GPIB or an RS232 port | Establish communications between the mainframe and a personal computer with GPIB or an RS232 port | ||
using either Hypertext support (Win XP or earlier) or a modem capable of RS-232-C support. | using either Hypertext support (Win XP or earlier) or a modem capable of RS-232-C support. | ||
For Hyperterminal on Win XP and earlier Windows computers: START > All Programs > Accessories > Communications > Hyper Terminal. | For Hyperterminal on Win XP and earlier Windows computers: START > All Programs > Accessories > Communications > Hyper Terminal. | ||
Use a normal RS-232-C cable. Do not use a Null Modem cable. | Use a normal RS-232-C cable. Do not use a Null Modem cable. | ||
The 11403A I have is set to the following | The 11403A I have is set to the following | ||
* Baudrate: 19200 | * Baudrate: 19200 | ||
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To clear the HFAdj chksum error, and obtain good high frequency/transient response, | To clear the HFAdj chksum error, and obtain good high frequency/transient response, | ||
you must enter all six cal constants for each channel. | you must enter all six cal constants for each channel. | ||
==11A52 HIGH FREQUENCY CALIBRATION CONSTANT COMMANDS== | ==11A52 HIGH FREQUENCY CALIBRATION CONSTANT COMMANDS== | ||
Query examples | Query examples | ||