Keyboard Connector; Audio Electrical Specifications - HP 2240 Owner's Manual

Table 1–1 summarizes the audio electrical specifications for this workstation.
Frequency Response
Input Sensitivity/Impedance
Line in
Microphone
Max Output Level/Impedance
Line Out
Headphone
Speaker (internal)
Output Impedance
Line Out
Headphone
Signal to Noise
Line Out
Headphone
Speaker
Line In
Microphone
THD (w/nominal load)
Line Out
Headphone
Speaker
Line In
Microphone
*
To convert from dB to number of significant bits, use the formula:
significant bits, or in other words, about 6 bits of noise.
1-14
Table 1–1. Audio Electrical Specifications
*
n = dB dB

. For example, for 61dB S/N then n= 61/6
20 log
6
10
Keyboard Connectors
PS/2 Keyboard Connectors
The PS/2 connectors provide an interface for the keyboard and mouse
to the system. Consult the documentation that accompanies each input
device for specific information concerning its use.
25–20,000Hz
2.0Vpk/47kohm
22mVpk/1kohm
2.8Vpp/47kohm
2.75Vpp/50ohm
5.88Vpp/48ohm
619ohm
118ohm
65dB
61dB
63dB
61dB
57dB
–73dB
–70dB
–68dB
–75dB
–73dB
~ ~

10