Black Box Data Recording
Black Box Recorder
Logged Data
BBR Status
BBR Period
BBR Length
Snapshot Operation
Snapshot Event Tags
BBR Clock Setup
BBR Alignment
Black Box Recorder
The N7908A Black Box Recorder is an option that performs continuous background logging of output
voltage, current, power, and system status to its own dedicated mass storage device.
On units with serial numbers MY59100101 and up, the Black Box Recorder is available as Option BBR.
On units with prior serial numbers, the N7908A Black Box Recorder accessory board installs in an
access port on the bottom of the chassis. Refer to Black Box Recorder installation.
You must use the Power Assistant software to view the BBR data after a snapshot
operation. You cannot view BBR data on the front panel or view the data using SCPI
commands.
The following list describes the key attributes of the BBR function:
l The BBR is discovered at power-on and is automatically enabled. If the BBR is not present or work-
ing, a self-test error is generated and logging is disabled. Refer to BBR Status.
l Logging starts automatically when the unit is turned on and does not interfere with any source or
measurement functions of the unit. Logging is done to a circular queue of approximately 380 MB.
l Two available logging rates are: one record every 10 ms, or one record every 100 ms. The 10 ms
rate saves 24 hours of data before the queue overwrites. The 100 ms rate saves 10 days of data
before the queue overwrites.
l Logging never stops while the unit is on except when the logging rate or the real-time clock set-
tings are changed. In these cases, logging is paused and restarted. Logging also stops when a
Power-fail protection occurs. In this case logging only resumes after output protection is cleared
by the user when AC power returns.
4 Using the Advanced Power System
162 Keysight N6900/N7900 Series Operating and Service Guide
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