Rohde & Schwarz ZNB20, Руководство пользователя

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Annexes
R&S
®
ZNB/ZNBT
1253 User Manual 1173.9163.02 ─ 38
Pin No. Name Input (I) or
Output (O)
Function
21 UC_EXT_GEN_TRG O Control signal for external generator
22 UC_EXT_GEN_BLANK I Handshake signal from external generator
23 AGND - Ground
24 UC_FOSW I Control input A, 5 V tolerant
25 UC_TRG2 I External trigger 2 input, 5 V tolerant
*) Feeding in the external trigger signal via the BNC connector EXT TRIG IN is equiva-
lent. The minimum pulse width of the trigger signals is 1
µ
s.
EMI Suppression
Use only double shielded cables or disconnect the input pins of the USER PORT con-
nector in order to avoid spurious input signals which may cause undesirable events.
10.2.1.2 USB
Double Universal Serial Bus connector of type A (master USB), used to connect e.g a
keyboard, mouse or other pointing devices, the Calibration Unit (accessory R&S ZV-
Z5x), a printer or external storage devices (USB stick, CD-ROM drive etc.).
USB Connection
The length of passive connecting USB cables should not exceed 1 m. The maximum
current per USB port is 500 mA. See also
Chapter 3.1.5, "EMI Suppression" ,
on page 17.
10.2.1.3 EXT TRIG IN
BNC female connector for external trigger input; see "FreeRun / External / Manual /
Multiple Triggers" on page 401. The external trigger input signal must be a 3.3 V or 5 V
TTL signal with a minimum pulse width of 1
µ
s. The trigger input has a high input impe-
dance (> 10 k
Ω
).
Trigger cables
Be aware that long trigger cables may cause signal reflections. Notice the instruction in
Chapter 3.1.5, "EMI Suppression" , on page 17.
10.2.1.4 EXT TRIG OUT
BNC female connectors for external trigger output; see "Output trigger" on page 401.
The R&S ZNB/ZNBT trigger output provides a configurable 5 V TTL trigger signal. The
output impedance is approximately 50 Ohm.
Interfaces and Connectors