(although its RMS value is between 125 and 250 volts), the overload protection
circuitry will be triggered.
The OVERLOAD PROTECTION PUSH TO RESET pushbutton
switch will illuminate to indicate that an overload condition was and/or is
present. The ATS will not be capable of measurement until the overload condition
was and/or is present.
The ATS will not be capable of measurement until the
overload condition has been corrected (i.e., setting the RANGE VOLTS switch to a
higher range and depressing the OVERLOAD PROTECTION PUSH TO RESET pushbutton switch
indicator).
(1) The overload protection circuitry is normally not intentionally
disabled unless signals having a high crest factor (greater than 2:1) are being
measured.
When such signals are applied to the ATS, the overload protection
circuitry (if not disabled) would remove the input when the signal peak value is
greater than 175 percent of the selected range RMS high limit. When the RMS level
of the applied signal will not damage either the attenuator or thermoelement, the
overload protection circuitry may be disabled by holding the OVERLOAD PROTECTION
PUSH TO DISABLE pushbutton switch depressed for the duration of the measurement.
(2) A standby mode is provided to eliminate the possibility of damaging the
thermoelement when changing input cables or switching signal levels.
Standby
switch S6 is provided to activate the overload protection circuit and disconnect
the input from the attenuator.
S6 is activated by depressing a momentary
pushbutton switch on the front panel. It functions only when the ATS is in the AC
mode.
The overload lamp DS3 lights to show standby operation.
When ready to
resume normal operation the overload protection reset switch S2 is pushed to
reconnect the input connectors to the attenuator.
Learning Event 2:
EXPLAIN THE MODEL 1600A OPERATION MODES
1. To operate the ATS in the manual balance mode, proceed as directed in the
following steps:
a. Couple the ATS to line power and momentarily press the POWER PUSH
pushbutton switch; the indicator portion of the switch should illuminate.
Allow
the ATS to warm up for at least 20 minutes.
b. Set the mode switch to MANUAL BALANCE.
c. Set the RANGE VOLTS switch to obtain a dial indication of 500 to 1000.
Push the STANDBY pushbutton and note that the overload lamp is illuminated.
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