Agilent Technologies, Inc. 53131A-061 Chan.1 and 2 rear inputs in parallel with front inputs, Chan. 3 input rear only

Replacement Product: 53220A

Transitioning from 53131A, 53132A, 53181A frequency counters to their replacements, the 53200 Series RF and universal frequency counter/timers

Option 060: Select when no 3rd channel option has been ordered
Adds parallel rear input connectors for channel 1 and channel 2 ^{(1), (2)}

Option 061: Use when an optional 3rd channel (3 GHz Option 030) is selected.
Adds parallel rear panel connectors for channels 1 and 2 ^{(1), (2)}
The BNC for channel 3 will be moved to the REAR of the instrument ⁽³⁾

Option 062: Use when an optional 3rd channel (5 GHz Option 050, or 12.4 GHz Option 124) is selected.
Adds parallel rear panel connectors for channels 1 and 2 ^{(1), (2)}
The N-type connector for channel 3 will be on the FRONT panel

1. When ordered with optional rear terminals, the channel 1 and 2 inputs are active on both the front and rear of the counter, though the specifications provided only apply to the rear terminals. Performance for the front terminals is degraded, but may be improved by terminating the rear terminals into 50ohms.
2. Since the front and rear inputs are connected in parallel they should be used independent of each other.
3. Specifications are the same for both the front or rear channel 3 connectors.