Tektronix 410, Service Manual

Page: 52 / 275

Installation
TDS 410, TDS 420 & TDS 460 Technical Reference Manual
2Ć5
Power-Down
CAUTION
DO NOT power down the oscilloscope when either running a signal
path compensation or when doing any of the adjustments described
in Section 5, Adjustment Procedures. To do so might result in the
loss of internally stored adjustment constants.
In general, do not power down the oscilloscope when doing operations that
affect the data types listed in Table 2-2. Wait for the oscilloscope to finish the
operation when doing adjustments, saving waveforms, or saving setups. After
operations complete, wait at least four more seconds before turning the
power off.
Improper power-down or unexpected loss of power to the oscilloscope can
result in corruption of non-volatile RAM (NVRAM). The following table
describes the messages displayed when power is restored after an abnormal
power-down.
Table 2-2: Effects of Corrupted Data
Corrupted Data Type Results
Adjustment Constants:
H
Signal Path Compensation A signal path compensation is required.
H
Voltage Reference A voltage reference adjustment is re-
quired (Section 5).
H
Low or High Frequency
Response A frequency response adjustment is re-
quired (Section 5).
H
Trigger Skew A trigger skew adjustment is required
(Section 5).
Error Log Errors logged are lost.
Reference Waveforms Waveforms Lost.
Saved Setups Setups Lost.