Warning Messages - Stanford Research Systems SR830 Manual

Front Panel

WARNING MESSAGES

The SR830 displays various warning messages whenever the operation of the instrument is not obvious. The
two tone warning alarm sounds when these messages are displayed.
Display Warning Message
LOCL LOut LOCAL LOCKOUT
IGAn chG IGAIN CHANGE
tc chnG TC CHANGE
hAr ovEr HARMONIC OVER
tc ovEr TC OVER
PhAS bAd PHASE BAD
rcal dAtA Err RECALL DATA ERR
undr UNDR
Meaning
If the computer interface has placed the unit in the REMOTE
state, indicated by the REMOTE led, then the keys and the knob
are disabled. Attempts to change the settings from the front
panel will display this message.
Indicates that the current conversion gain has been changed to
1 MΩ as a result of changing the sensitivity. Sensitivities from
20 nA to 1 µA require 1 MΩ current gain.
Indicates that the time constant has been changed, either by
increasing the detection frequency from below 200 Hz to above
200 Hz, or by changing the sensitivity, dynamic reserve, filter
slope, or expand.
An attempt to increase the harmonic detect frequency above
102 kHz will display this message.
Indicates that the time constant is too long (>1s) for Auto Gain to
run.
Indicates that the phase is unstable and Auto Phase will not run.
This message is displayed if the recalled setup is not valid. This
is usually because a setup has never been saved into the select-
ed buffer.
Indicates unit may not be precisely locked at very low frequency.
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