3 — INSTALLATION AND WIRING
Curtis Model 3301T Digital Instrumentation – September 2021
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pg. 26
OPERATING VOLTAGE
e following table describes the B+ startup and operating voltages:
Minimum Minimum Startup Nominal Maximum
9VDC 10VDC 12–96VDC 120VDC
Applying B+ voltages above 120V may damage the 3301T and is not recommended. e device is
designed to withstand continuous reverse polarity connections.
Note: All voltages listed in this manual are DC voltages.
OPERATING CURRENT
e following tables describe the B+ pin’s operating current with the LCD heater o and on:
Table 6 Operating Current — LCD Heater Off
Keyswitch on
B+ Voltage
Typical Maximum
Keyswitch off
12V 166mA 209mA 110mA
24V 80mA 100mA 54mA
36V 56mA 69mA 39mA
48V 46mA 54mA 32mA
60V 39mA 54mA 28mA
72V 36mA 42mA 26mA
80V 34mA 40mA 25mA
96V 33mA 37mA 24mA
Table 7 Operating Current — LCD Heater On
B+ Voltage Typical Maximum
12V 645mA 685mA
24V 575mA 596mA
36V 536mA 550mA
48V 524mA 530mA
60V 488mA 503mA
72V 482mA 486mA
80V 470mA 475mA
96V 463mA 466mA
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