12 | Keysight | E4991B Impedance Analyzer - Data Sheet
Interface (continued)
USB host port
Universal serial bus jack, Type A configuration; female; provides connection to mouse,
keyboard, printer or USB stick memory.
USB (USBTMC ) interface port
Universal serial bus jack, Type B configuration (4 contacts inline); female; provides
connection to an external PC; compatible with USBTMC-USB488 and USB 2.0.LA USB
Test and Measurement Class (TMC) interface that communicates over USB, complying
with the IEEE 488.1 and IEEE 488.2 standards.
Handler interface
36-pin centronics, female
Measurement Terminal (At Test Head)
Connector type: 7-mm connector
Rear Panel Connectors
External reference signal input connector
Frequency: 10 MHz ± 10 ppm (typical)
Level: 0 dBm ± 3 dB (typical)
Input impedance: 50 Ω (nominal)
Connector type: BNC, female
Internal reference signal output connector
Frequency: 10 MHz ± 10 ppm (typical)
Level: 0 dBm ± 3 dB into 50 Ω (typical)
Output impedance: 50 Ω (nominal)
Connector type: BNC, female
High stability frequency reference output connector
(Option E4991B-1E5)
Frequency: 10MHz ± 1ppm
Level: 0 dBm minimum
Output impedance: 50 Ω (nominal)
Connector type: BNC, female
External trigger input connector
Level:
LOW threshold voltage: 0.5 V
HIGH threshold voltage: 2.1 V
Input level range: 0 V to +5 V
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