Specifications

23
HP 44477A
• 7 Single-Pole-Double-Throw relays module
• Switching up to 2 A, 250 V
Description
The HP 44477A is a Form-C relay module providing
seven independent Single-Pole-Double-Throw relays
for general purpose switching and control of external
devices. Using an external power supply, you can use
the module to drive remote RF, coaxial, and microwave
devices such as the HP 876xx, HP 8710xx series, and
mercury relays. This module is normally set up to use
an external power supply for voltages up to 250 V DC,
and can be easily configured to use the internal 5 V DC
power supply. In applications where the module's
voltage or current specifications are going to be
exceeded, use the module to drive a properly rated
external relay to switch those signals.
Specifications
Input Characteristics
Thermal Offset: <3µV
Maximum Scan Rate: 43 ch/ sec
Relay life (mechanical): 10
8
Maximum Voltage: 250V
Maximum Current: Per channel 2A
Per module 14A
Maximum Power: Per channel 60W or 125VA
Per module 420W or 875VA
Initial Closed Channel Resistance: <1Ω
DC Isolation (<40°C, <60%RH):
Open Channel >10
11
Ω
Channel-Chassis >5x10
11
Ω
AC Isolation
Capacitance (with 1 channel closed):
Open Channel, Channel-Channel <10pF
Channel-Chassis <25pF
100kHz 1MHz 10MHz
Insertion Loss <0.20dB <0.25dB <0.50dB
To rack mount an HP 3499B with a fill panel, order
Option 1CM.
To rack mount two instruments in a sliding support
shelf, please order shelf (P/N 5063-9255) and slide kit
(P/N 1494-0015), and also use the included tie-down
clip (03499-21002).
Form-C relay Module Rack Mounting Kits
HP 3499A Rack Mount Kit with Handles (Opt. 1CP)
HP 3499A Rack Mount Kit (Opt. 1CM)