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Instrument Overview Rear Panel and Connector Diagrams
MS278XB OM 3-41
10
PS/2 Keyboard
Interface
Provides connection to an external PS/2 keyboard. 6-pin
DIN
11
Reference Output
Provides a reference frequency output
Using the internal 10 MHz reference:
Level: 8 dBm ± 3 dB
Frequency: 10 MHz
Using an external frequency reference:
Level: –19 dBm to –14 dBm
Frequency: Same as external frequency
BNC
Female
12
Reference Input
Provides a reference frequency input
Level: –6 dBm < input signal < +10 dBm
Frequency: Any frequency from 1 to 25 MHz with
1 MHz resolution and 1.544 or 2.048 MHz
BNC
Female
13
External IF Input
1128.65 MHz input for VSA, mixer, etc. SMA
Female
14
IF Output
Outputs 75 MHz IF
Level: –5 dBm ± 5 dB
BW: > 40 MHz (>120 MHz without image rejection filter)
BNC
Female
15
I Input
Differential input for baseband I/Q
50Ω or 1MΩ
Switchable unbalanced or differential
1 Volt max
BNC
Female
16
I
Input
VSA I
differential input for baseband I/Q
50Ω or 1 MΩ
Switchable unbalanced or differential
1 Volt max
BNC
Female
17
Q Input
VSA Q differential input for baseband I/Q
50Ω or 1 MΩ
Switchable unbalanced or differential
1 Volt max
BNC
Female
Table 3-9. MS278XB Rear Panel Index Legend
Index Name/Image Description Connector