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Keysight Technologies (Agilent HP) 44721A () Main Features and Specifications

Product Specs

  • Status Discontinued

The HP 44721A is a digital input accessory for the 3852A data acquisition and control unit.

The 44721A has 16 channels and can detect the presence of DC voltage inputs. The input detection is based on nominal voltages selected by movable jumpers. The nominal voltages are 5, 12, 24, and 48 volts DC. All channels are isolated from chassis ground using opto-isolators.

Each channel of the 44721A also has the ability to independently totalize both positive and negative logic transitions, whichever one is selected. The maximum on/off frequency for the 44721A is 500 cycles/second. Any channel can be programmed to set an interrupt for an edge occurrence (positive or negative) or a counter rollover to zero.

The 44721A has a common debounce circuitry for all channels to prevent erroneous readings. The debounce time is user selectable by changing the debounce oscillator frequency. The frequencies are 10 Hz, 100 Hz, and 1 kHz.

The 44721A has two main assemblies—a component module and a terminal module. The component module contains the backplane interface electronics, the debounce oscillator, and the channel opto-isolators. The terminal module contains terminal blocks for connection to external wiring, the debounce capacitor (jumper selected) and an input attenuator (jumper selected). The control logic interfaces the 44721A with the 3852A backplane. The control logic contains the read and write registers used by the digital bus to commmunicate with the 44721A.

The 44721A has a non-isolated low current 5 V DC supply with 9.4 kΩ pull-up resistors on each channel input. The supply can be used to detect contact closures. If the +5 VDC terminal is used, the channel connected is no longer isolated from the 3852A.

  • Operating range
    • Threshold voltage at nominal 5 Vdc: Vlow (max) 1 V, Vhigh (min) 4 V
    • Threshold voltage at nominal 12 Vdc: Vlow (max) 2.5 V, Vhigh (min) 9.5 V
    • Threshold voltage at nominal 24 Vdc: Vlow (max) 7 V, Vhigh (min) 17 V
    • Threshold voltage at nominal 48 Vdc: Vlow (max) 14 V, Vhigh (min) 31 V
    • Input current at nominal 5 Vdc: 0.5 mA
    • Input current at nominal 12 Vdc: 1.3 mA
    • Input current at nominal 24 Vdc: 2.8 mA
    • Input current at nominal 48 Vdc: 5.8 mA
  • Maximum input voltage
    • 80 Vpeak between high and low terminal of each channel
    • 354 Vpeak or 250 Vdc between channels or between any terminal and chassis
  • Totalize and totalize Modulo
    • Accuracy: ±1 count
    • Range: -231 to +231 - 1 (32 bits, 2s complement)
    • Range of Modulo N: 2 to 65,535
    • Maximum on/off frequency: 500 cycles per second
  • 5 volt power supply
    • 4.5 V to 5.5 Vdc
    • 8 mA maximum output current
  • Maximum wire size: 16 AWG