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3 — INSTALLATION AND WIRING
Curtis Model 3301T Digital Instrumentation – September 2021
pg. 26
OPERATING VOLTAGE
The 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. The device is
designed to withstand continuous reverse polarity connections.
Note: All voltages listed in this manual are DC voltages.
OPERATING CURRENT
The following tables describe the B+ pin’s operating current with the LCD heater off 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