Table 5-3. Ratio Ranging

TM 11-6625-444-14-2

Table 5-3. Ratio Ranging

*For optimum Ratio performance within the EXT REF voltage operating limits of ± 1 V to ± 2 V

use the 2 volt RANGE. AUTO range operation in DC/DC RATlO mode is only applicable for in-

put voltages greater than ± 2 volts using the 20V, 200V and 1000V ranges.

voltmeter will be in the 2V full scale range con-

5-6. Auto Ranging

dition. When a voltage is applied that results in

a count higher than (approximately) 195,000,

When the AUTO switch is pushed in to the AU-

The

the next higher range will be selected.

TO position, ranging is automatically controlled

voltmeter is fully protected for any signal to

by the up/down range detectors (A1-U404 and

± 1000 Vdc and 1000 Vac rms. If the voltage is

changed to a level lower than (approximately)

U405 respectively) and, in turn, the commands

to the up/down counter. For automatic voltage

12,000 counts, the next lower range will be se-

ranging in the absense of any input signal, the

lected.