Annexes
R&S
®
ZNC
738
User Manual 1173.9557.02 ─ 13
Pin No.
Name
Input (I) or
Output (O)
Function
11
CHANNEL BIT 3
O
Channel-specific bit 3
12
GNDD
-
Digital ground
13
PASS 1
O
Pass/fail result of limit check; TTL Out Pass 1 (see
14
PASS 2
O
Pass/fail result of limit check TTL Out Pass 2
15
GNDD
-
Digital ground
16
DRIVE PORT 1
O
Test port 1 is source port (drive port); see
17
DRIVE PORT 2
O
Test port 2 is source port (drive port)
18
DRIVE PORT 3
O
Test port 3 is source port (drive port)
19
DRIVE PORT 4
O
Test port 4 is source port (drive port)
20
GNDD
-
Digital ground
21
EXT GEN TRG
O
Control signal for external generator
22
EXT GEN BLANK
I
Handshake signal from external generator
23
GNDD
-
Digital ground
24
FOOT SWITCH 1
I
Control input A, 5 V tolerant
25
EXT TRG 2
I
External trigger 2 signal, 5 V tolerant
*) Feeding in the external trigger signal via the BNC connector EXT TRIG IN is equivalent.
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.
9.1.1.2
EXT TRIG OUT / IN
Two BNC female connectors for external trigger input or output signals; see
External / Manual / Multiple Triggers"
Input signal:
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 impedance (> 10 k
Ω
).
Output signal:
The R&S ZNC trigger output provides a configurable 5 V TTL trigger
signal. The output impedance is approximately 50 Ohm.
Trigger cables
Be aware that long trigger cables may cause signal reflections!
Interfaces and Connectors